C/C++ Programming Help Thread

[Samstag]

I still think he is under allocating as he is explictly allocating 4 bytes for the string whereas

char * text = "dslkfljsf";

Would be fine.

You may be right, but I'm pretty sure that as long as he doesn't try to modify the contents, it should work. I'd think the compiler would raise warnings if it wasn't valid. Apparently that's not the case.

[yaustar]

if (ourImage) {
//Image load unsuccessful
printf("Image Load Unsuccessful! \n")
} else

Missing ; at the end of the code line. Should be

if (ourImage) {
//Image load unsuccessful
printf("Image Load Unsuccessful! \n");
} else

-= Double Post =-

You may be right, but I'm pretty sure that as long as he doesn't try to modify the contents, it should work. I'd think the compiler would raise warnings if it wasn't valid. Apparently that's not the case.

char Nuts[4] = "defg";

This threw up a compiler error on DevKitPSP. I am surprised it was okay on that code was posted up. Maybe it was with the older PSPDEV SDK?

[Samstag]

char Nuts[4] = "defg";[/code]
This threw up a compiler error on DevKitPSP. I am surprised it was okay on that code was posted up. Maybe it was with the older PSPDEV SDK?

That should be a GCC issue rather than being PSP-specific, but I guess it's possible an older psp-gcc let that through. Maybe the original poster only got a warning and didn't mention it? I don't see a lot of people posting warnings when they ask for help (heck, I know professionals who might ignore a warning if they don't see an immediate problem).

[yaustar]

That should be a GCC issue rather than being PSP-specific, but I guess it's possible an older psp-gcc let that through. Maybe the original poster only got a warning and didn't mention it? I don't see a lot of people posting warnings when they ask for help (heck, I know professionals who might ignore a warning if they don't see an immediate problem).

Possibly. It does seem odd behaviour from the compiler though.

Where I work, we don't get that luxury, all warnings are treated as errors in our builds.

[Moca]

if (ourImage) {
//Image load unsuccessful
printf("Image Load Unsuccessful! \n")
} else

Missing ; at the end of the code line. Should be

if (ourImage) {
//Image load unsuccessful
printf("Image Load Unsuccessful! \n");
} else

Thanks a lot. I always make those kinds of mistakes :P.
It is either a spelling or one of those:ROFL: . Other than that, my code is usually fine.

[SG57]

Moca - I somehow doubt your priorexperience in C++ if you dont understandone of the msot common of errors the compiler spits out. But, i may be wrong and you just have never encountered such an error, but it doesnt matter in the end (although the error is self explanatory)

[zwnage]

That should be a GCC issue rather than being PSP-specific, but I guess it's possible an older psp-gcc let that through. Maybe the original poster only got a warning and didn't mention it? I don't see a lot of people posting warnings when they ask for help (heck, I know professionals who might ignore a warning if they don't see an immediate problem).

Nope, I would have caught it if there was an error. I am almost sure my compiler did not issue an error, but I might be wrong. I am using cygwin by the way.

EDIT: I tested it out agian, char test1 [4] = "1000"; made my glitch that I posted previously, but had no warnings in cgywin. char test1 [1] = "1000";, however, made a warning

Anywho, I ran into another problem; how do I split a string into multiple parts in C?

ex:
char test[8] = "Test";

How would I break apart the string into individual charactors (T, e, s, and t)? I want to use something like "if the second letter of string test equals e, then"

And is there a command to determine the length of the string? Does something like length(test) exist? (I don't want the length of the array of characters, I just want the length of the string held by test, which is "Test", which should be 4)

[SG57]

zwnage - It already is. A string is an array of characters, and your asking for how to get a character.

Simply provide the argument/parameter with whatever element the charactere is in.

ex:

char Test[8] = "Test";

if (Test[1] == 'e') { this will execute }

[Samstag]

And is there a command to determine the length of the string? Does something like length(test) exist? (I don't want the length of the array of characters, I just want the length of the string held by test, which is "Test", which should be 4)

int length = strlen(Test);

[hallo007]

some question about printtexttoscreen
if you wanne do a "\n" in printf but you are using print , how many pixels will you need to go down?? ,

one space how many pixels need that???


thnx in advance;)

[the unique warrior]

some question about printtexttoscreen
if you wanne do a "\n" in printf but you are using print , how many pixels will you need to go down?? ,

one space how many pixels need that???


thnx in advance;)

printtexttoscreen is not like printf :) as you know your self
params -->

printTextScreen(int x, int y, const char* text, u32 color);
/*
@param x: the starting position of the text (x-Coordinate)
@param y: The level of the text on the screen (y-Coordinate_
@param text: The text to be written.
@param color : a Color if your not using RGB mode simply use hex color (example black = 0x000000)
Stil confused ? -->
/**
 * Print a text (pixels out of the screen or image are clipped).
 *
 * @param x - left position of text
 * @param y - top position of text
 * @param text - the text to print
 * @param color - new color for the pixels
 */
*/

Hope I helped :)
there is no code for a new line just add 10+ to y current position of the text :)

[Moca]

This program compiles right that I made, but whe I run it, it doesnt operate exactly how I want. It does what its supposed to do, but it also does something very irritating. The text continuously repeats when I hold a button. Dont attack. I just started to code yesterday :P

Anyways, heres some screenshots with IR-SHELL of what happens.

Spoiler for Pictures of What is happening:

For fun...

Spoiler for Code Stuff:

/*My personal app to delete ceertain files in Flash0 when needed like Location free or Update.*/




#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/unistd.h>

#include <pspctrl.h>
#include <pspdebug.h>
#include <pspkernel.h>
#include <pspiofilemgr.h>
#include <pspdisplay.h>
#include <psptypes.h>

PSP_MODULE_INFO("TEST", 0x1000, 1, 1); /* 0x1000 = Kernel MODE*/
PSP_MAIN_THREAD_ATTR(0); /* 0 for kernel mode*/

#define printf pspDebugScreenPrintf


void dump_threadstatus(void);

int done = 0;


/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
sceKernelExitGame();
return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
int cbid;

cbid = sceKernelCreateCallback(" Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCall back(cbid);

sceKernelSleepThreadCB();

return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
int thid = 0;

thid = sceKernelCreateThread("up date_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0) {
sceKernelStartThread(thid , 0, 0);
}

return thid;
}

//Everything below is expertly crafted. ;)


int main(void)

{
pspDebugScreenInit();
SceCtrlData pad;
SetupCallbacks();


/* to mount flash0 as a writable mass storage */

sceIoUnassign("flash0:");
sceIoAssign("flash0:", "lflash0:0,0", "flashfat0:", 0, NULL, 0);


printf("Push Cross to Delete Flash0:/vsh/resource/02.BMP... \n \n");

printf("Push Triangle to Delete Flash0:/vsh/resource/03.BMP...\n \n");

printf("Push Circe to Delete Location Free Files. \n \n");



while(done !=1) {

sceCtrlReadBufferPositive (&pad, 1);

//Removes "Flash0:/vsh/resource/02.bmp" when Cross is pressed.

if(pad.Buttons & PSP_CTRL_CROSS)
{
sceIoRemove("flash0:/vsh/resource/02.BMP");
printf("Cross pressed...Deleting flash0:/vsh/resource/02.BMP \n \n");
printf("Done! Files deleted \n");
printf("~~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}





//Removes "Flash0:/vsh/resource/03.bmp" when triangle is pressed.
if(pad.Buttons & PSP_CTRL_TRIANGLE)
{
sceIoRemove("flash0:/vsh/resource/03.BMP");
printf("Triangle pressed...Deleting flash0:/vsh/resource/02.BMP \n \n");
printf("Done! Files deleted \n");
printf("~~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}



//Removes Location Free TV files when Circle is pressed.
if(pad.Buttons & PSP_CTRL_CIRCLE)
{
printf("Cross pressed...Deleting flash0:/vsh/resource/02.BMP \n");
sceIoRemove("flash0:/vsh/nodule/lftv_main_plugin.prx");
sceIoRemove("flash0:/vsh/nodule/lftv_middleware.prx");
sceIoRemove("flash0:/vsh/nodule/lftv_plugin.prx");
sceIoRemove("flash0:/vsh/resource/lftv_main_plugin.rco");
sceIoRemove("flash0:/vsh/resource/lftv_plugin.rco");
sceIoRemove("flash0:/vsh/resource/lftv_tuner_jp_jp.rco");
sceIoRemove("flash0:/vsh/resource/lftv_tuner_us_en.rco");
printf("Done! Deleted Files for Location Free TV \n");
printf("~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}

}


sceKernelDelayThread(1000 *7000);
sceKernelExitGame();
return 0;
}

[Insert_Witty_Name]

It's because the sensitivity of the controls is very high. What you deem as one keypress may well be 8 or more to the PSP.

The solution is to use the old faithful 'lastpad' method, like so (with comments):

Spoiler for Correct Code:

/*My personal app to delete ceertain files in Flash0 when needed like Location free or Update.*/




#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/unistd.h>

#include <pspctrl.h>
#include <pspdebug.h>
#include <pspkernel.h>
#include <pspiofilemgr.h>
#include <pspdisplay.h>
#include <psptypes.h>

PSP_MODULE_INFO("TEST", 0x1000, 1, 1); /* 0x1000 = Kernel MODE*/
PSP_MAIN_THREAD_ATTR(0); /* 0 for kernel mode*/

#define printf pspDebugScreenPrintf


void dump_threadstatus(void);

int done = 0;


/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
sceKernelExitGame();
return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
int cbid;

cbid = sceKernelCreateCallback(" Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCall back(cbid);

sceKernelSleepThreadCB();

return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
int thid = 0;

thid = sceKernelCreateThread("up date_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0) {
sceKernelStartThread(thid , 0, 0);
}

return thid;
}

//Everything below is expertly crafted.


int main(void)

{
pspDebugScreenInit();
SceCtrlData pad, lastpad; // ADDED 'lastpad' HERE
sceCtrlReadBufferPositive(&lastpad, 1); // INIT THE 'lastpad' VARIABLE
SetupCallbacks();


/* to mount flash0 as a writable mass storage */

sceIoUnassign("flash0:");
sceIoAssign("flash0:", "lflash0:0,0", "flashfat0:", 0, NULL, 0);


printf("Push Cross to Delete Flash0:/vsh/resource/02.BMP... \n \n");

printf("Push Triangle to Delete Flash0:/vsh/resource/03.BMP...\n \n");

printf("Push Circe to Delete Location Free Files. \n \n");



while(done !=1) {

sceCtrlReadBufferPositive (&pad, 1);

if (pad.Buttons != lastpad.Buttons) {
   // DIFFERENT BUTTON HAS BEEN PRESSED
   lastpad = pad; // SET LAST BUTTON PRESSED

//Removes "Flash0:/vsh/resource/02.bmp" when Cross is pressed.

if(pad.Buttons & PSP_CTRL_CROSS)
{
sceIoRemove("flash0:/vsh/resource/02.BMP");
printf("Cross pressed...Deleting flash0:/vsh/resource/02.BMP \n \n");
printf("Done! Files deleted \n");
printf("~~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}





//Removes "Flash0:/vsh/resource/03.bmp" when triangle is pressed.
if(pad.Buttons & PSP_CTRL_TRIANGLE)
{
sceIoRemove("flash0:/vsh/resource/03.BMP");
printf("Triangle pressed...Deleting flash0:/vsh/resource/02.BMP \n \n");
printf("Done! Files deleted \n");
printf("~~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}



//Removes Location Free TV files when Circle is pressed.
if(pad.Buttons & PSP_CTRL_CIRCLE)
{
printf("Cross pressed...Deleting flash0:/vsh/resource/02.BMP \n");
sceIoRemove("flash0:/vsh/nodule/lftv_main_plugin.prx");
sceIoRemove("flash0:/vsh/nodule/lftv_middleware.prx");
sceIoRemove("flash0:/vsh/nodule/lftv_plugin.prx");
sceIoRemove("flash0:/vsh/resource/lftv_main_plugin.rco");
sceIoRemove("flash0:/vsh/resource/lftv_plugin.rco");
sceIoRemove("flash0:/vsh/resource/lftv_tuner_jp_jp.rco");
sceIoRemove("flash0:/vsh/resource/lftv_tuner_us_en.rco");
printf("Done! Deleted Files for Location Free TV \n");
printf("~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}

} // END 'lastpad' CHECK

}


sceKernelDelayThread(1000 *7000);
sceKernelExitGame();
return 0;
}

A few tips. There's no need for the 'break' statements, you could have just set 'done = 1'. On a similar note, 'while(!done)' reads better than what you have currently.

Learn to indent code correctly, it helps you read your code and others who have to read it too and is generally good practise.

Finally you should check the return value of the sceIoRemove calls to ensure the file was deleted successfully.

[hallo007]

printtexttoscreen is not like printf :) as you know your self
params -->

printTextScreen(int x, int y, const char* text, u32 color);
/*
@param x: the starting position of the text (x-Coordinate)
@param y: The level of the text on the screen (y-Coordinate_
@param text: The text to be written.
@param color : a Color if your not using RGB mode simply use hex color (example black = 0x000000)
Stil confused ? -->
/**
 * Print a text (pixels out of the screen or image are clipped).
 *
 * @param x - left position of text
 * @param y - top position of text
 * @param text - the text to print
 * @param color - new color for the pixels
 */
*/

Hope I helped :)
there is no code for a new line just add 10+ to y current position of the text :)

and one space how many pixels are that?

[Moca]

It's because the sensitivity of the controls is very high. What you deem as one keypress may well be 8 or more to the PSP.

The solution is to use the old faithful 'lastpad' method, like so (with comments):

Spoiler for Correct Code:

/*My personal app to delete ceertain files in Flash0 when needed like Location free or Update.*/




#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/unistd.h>

#include <pspctrl.h>
#include <pspdebug.h>
#include <pspkernel.h>
#include <pspiofilemgr.h>
#include <pspdisplay.h>
#include <psptypes.h>

PSP_MODULE_INFO("TEST", 0x1000, 1, 1); /* 0x1000 = Kernel MODE*/
PSP_MAIN_THREAD_ATTR(0); /* 0 for kernel mode*/

#define printf pspDebugScreenPrintf


void dump_threadstatus(void);

int done = 0;


/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
sceKernelExitGame();
return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
int cbid;

cbid = sceKernelCreateCallback(" Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCall back(cbid);

sceKernelSleepThreadCB();

return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
int thid = 0;

thid = sceKernelCreateThread("up date_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0) {
sceKernelStartThread(thid , 0, 0);
}

return thid;
}

//Everything below is expertly crafted.


int main(void)

{
pspDebugScreenInit();
SceCtrlData pad, lastpad; // ADDED 'lastpad' HERE
sceCtrlReadBufferPositive(&lastpad, 1); // INIT THE 'lastpad' VARIABLE
SetupCallbacks();


/* to mount flash0 as a writable mass storage */

sceIoUnassign("flash0:");
sceIoAssign("flash0:", "lflash0:0,0", "flashfat0:", 0, NULL, 0);


printf("Push Cross to Delete Flash0:/vsh/resource/02.BMP... \n \n");

printf("Push Triangle to Delete Flash0:/vsh/resource/03.BMP...\n \n");

printf("Push Circe to Delete Location Free Files. \n \n");



while(done !=1) {

sceCtrlReadBufferPositive (&pad, 1);

if (pad.Buttons != lastpad.Buttons) {
   // DIFFERENT BUTTON HAS BEEN PRESSED
   lastpad = pad; // SET LAST BUTTON PRESSED

//Removes "Flash0:/vsh/resource/02.bmp" when Cross is pressed.

if(pad.Buttons & PSP_CTRL_CROSS)
{
sceIoRemove("flash0:/vsh/resource/02.BMP");
printf("Cross pressed...Deleting flash0:/vsh/resource/02.BMP \n \n");
printf("Done! Files deleted \n");
printf("~~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}





//Removes "Flash0:/vsh/resource/03.bmp" when triangle is pressed.
if(pad.Buttons & PSP_CTRL_TRIANGLE)
{
sceIoRemove("flash0:/vsh/resource/03.BMP");
printf("Triangle pressed...Deleting flash0:/vsh/resource/02.BMP \n \n");
printf("Done! Files deleted \n");
printf("~~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}



//Removes Location Free TV files when Circle is pressed.
if(pad.Buttons & PSP_CTRL_CIRCLE)
{
printf("Cross pressed...Deleting flash0:/vsh/resource/02.BMP \n");
sceIoRemove("flash0:/vsh/nodule/lftv_main_plugin.prx");
sceIoRemove("flash0:/vsh/nodule/lftv_middleware.prx");
sceIoRemove("flash0:/vsh/nodule/lftv_plugin.prx");
sceIoRemove("flash0:/vsh/resource/lftv_main_plugin.rco");
sceIoRemove("flash0:/vsh/resource/lftv_plugin.rco");
sceIoRemove("flash0:/vsh/resource/lftv_tuner_jp_jp.rco");
sceIoRemove("flash0:/vsh/resource/lftv_tuner_us_en.rco");
printf("Done! Deleted Files for Location Free TV \n");
printf("~~~~~~Returning to XMB in 7 seconds~~~~~~~ \n");
break;
}

} // END 'lastpad' CHECK

}


sceKernelDelayThread(1000 *7000);
sceKernelExitGame();
return 0;
}

A few tips. There's no need for the 'break' statements, you could have just set 'done = 1'. On a similar note, 'while(!done)' reads better than what you have currently.

Learn to indent code correctly, it helps you read your code and others who have to read it too and is generally good practise.

Finally you should check the return value of the sceIoRemove calls to ensure the file was deleted successfully.

Thank you so much for that. It works and now I can continue with my work.



BTW, I do indent. I use Bloodshed. It indents everything very nicely. You should see my code in Dev C++. Ooooh. Sexy. I usially comment every single line, but a lot of it was removed to make forum space. Thank you for your help. Now all I need to do it have better spelling. That is the reason for most of my errors because I type the entire code manually.

I truly appreciate your help. Thanks.

[the unique warrior]

and one space how many pixels are that?

usage:

printTextScreen(10, 10, "This Text Is Written On The Screen As Its Shown HERE With The Spaces!", 0xff00ff);
printTextScreen(i10, 20, "This Text Is Under The Other Line Of Text", 0x00ffff);

I Think now you know whats going on eh ;)

[Moca]

Ok, I need help. I dont know how to write a file to flash0. I already know how to delete. I want to be able to restore files.

Could someone write a baisic program that only writes a file to flash0. I tried looking through source codes, but there is too much stuff that I cant tell if it is needed or not.

What I am requesting is a simple file with the #include's, and the rest of the file.
Nothing else. I can manage from there. I was hoping you would only post what is needed to write a file. Thanks. :)

[psphacker12.]

how can I use fillScreenRect with 50% transparent?

[SodR]

how can I use fillScreenRect with 50% transparent?

You can't. But there is an example further back in this thread of a function that does the same that insert_witty_name gave me. Try searching ;)

[SG57]

SodR - Cant you just make a 32 bit RGBA value and have 50% transparency? Seems like that would work and I believe Ive done it before...

[Raphael]

Not with fillScreenRect. It only fills the framebuffer with the colorvalue and doesn't do any blending or similar. Just render a fullscreen rect (GU_SPRITES primitive) over the screen and enable blending.

[SG57]

I havent heard from you in a long... long...

...

long time... But anyways, thanks for clearing that up, I guess I was just using an image with half transprency.

[Raphael]

Time is short and there's already few of it. Too few to enjoy all the goods of life at the same time (coding, games and girls ;P).

PS: I think there should be a special FAQ thread for all those graphics.c questions, they are always the same. Or even better, someone should change a lot of the graphics.c library to be more newb-friendly (and faster at the same time... I still can't believe someone coded direct framebuffer access to clear the screen on PSP).

[SG57]

Hmm... Not havinga PSP, I suppose I now have time to think about what you said... True time is short, and that brought me to googling time travel months ago, I found out that astronauts traveling to the moon are going nano-seconds into the future... Since, as you get closer to the speed of light, time slows down.

But back on topic... Isn't the graphics library already GU accelerated, the parts that arent,Im sure someone wanting to could easily make it GU accelerated... Unless theres a more efficient way (Media Engine is for sound any sound card activity (or some variation of that statement) right? I never got into using it when I had a PSP)...

[hallo007]

this just shows black screens

Spoiler for code:

#include <pspdisplay.h>
#include <pspkernel.h>
#include <pspdebug.h>
#include <psputility.h>
#include <psppower.h>

#include "graphics/graphics.h"
/************************* ************************* ************************* ***********************/
PSP_MODULE_INFO("Customiz e your firmware", 0x1000, 1, 1);
PSP_MAIN_THREAD_ATTR(0);
/************************* ************************* ************************* ********************/
int checkpower(void) {

int battery;
int adaptor;

if(scePowerIsBatteryExist ()) {

battery =scePowerGetBatteryLifePe rcent();
adaptor = scePowerIsPowerOnline();

if(battery > 50) {
printTextScreen(10, 10,"Battery is OK ", 0xFF0000);
if(adaptor){
printTextScreen(10, 20,"\nAc adaptor is plugged\n", 0xFF0000);
printTextScreen(10, 30,"Going to menu....", 0xFF0000);
flipScreen();
sceKernelDelayThread(5000 000);

}
else if(!adaptor){
printTextScreen(10, 20,"\nWarning: Ac adaptor is not plugged in!!!!\n", 0xFF0000);
printTextScreen(10, 30,"Going to menu....", 0xFF0000);
flipScreen();
sceKernelDelayThread(5000 000);

}


} else if(battery <50){

printTextScreen( 10, 10,"Battery needs to be 50%% ", 0xFF0000);
if(adaptor){
printTextScreen(10, 20,"\nBut Ac adaptor is plugged\n", 0xFF0000);
printTextScreen(10, 30,"Going to menu....", 0xFF0000);
flipScreen();
sceKernelDelayThread(5000 000);

}
else if(!adaptor){
printTextScreen(10, 20,"\nWarning: Ac adaptor is not plugged in!\n",0x0000ff);
printTextScreen(10, 30,"Exiting....", 0xFF0000);
flipScreen();
sceKernelDelayThread(5000 000);
sceKernelExitGame();
}

flipScreen();


}





}
else{

printTextScreen(10, 10,"No battery , exiting", 0xFF0000);
sceKernelDelayThread(5000 000);
sceKernelExitGame();
}

}

/************************* ************************* ************************* *********************/
int main(void)
{

pspDebugScreenInit();
checkpower();

return 0;
}

[Raphael]

Digging into the world of relativity theory can either harm or charm you, depending on your view of "reality". Really worth trying to understand though, I can just recommend reading up on it.
What you talked about though is not really time travel, the astronauts just have a trip that takes them x.0000 seconds (by the means of a clock they carry with them), while when they return on earth x.0001 seconds have passed already (a clock on earth), so they basically are younger - which is a kind of time travel from their point of view, but that's what the relativity theory is all about - points of view.
Real time travel is only possible through wormholes (or black holes in a selfdestructive way), at least by theory. Not without all the time-paradox mess though, so don't try it at home ;P

To get back to topic: The graphics.c library makes spare use of GU every then and when, but not consistently and therefore lacks things like the transparent fill, where it could be possibly with a true GU implementation. The problem is that the library wasn't really layed out newb-friendly, but used in a newb tutorial. Well, anyways, someone just put together the quirks of the graphics.c library and make up a FAQ for all those starters questions :P
I need to talk to IWN, he wanted to start an improved version of the library way back on psp-programming.com.


@hallo007: you use redundant else if cases.
in

if (adaptor) { } else { }

the else case already contains the !adaptor case, as that's exactly what else means.
Also, your battery check does not care for the == 50 case and will then return with a "no battery" message. Fix that.
Also, you need to call initGraphics() before you do anything with that graphics.c library, though that will only set one stupid variable to true and nothing else. Another point for the FAQ :/ I start disliking that library more and more

[Devun_06]

Using C, how would I fix issues with returning char values from a function?
I've been using char function() w/char* returns and it hasn't worked then I've used
char *key;
char *function() w/return( key); and it crashes.

But!
char *function()
{
char key[99];
return(key);
}
works, but I've seen many issues concerning char return values and would like to know which route really works and works best?

[Waterbottle]

Using C, how would I fix issues with returning char values from a function?
I've been using char function() w/char* returns and it hasn't worked then I've used
char *key;
char *function() w/return( key); and it crashes.

But!
char *function()
{
char key[99];
return(key);
}
works, but I've seen many issues concerning char return values and would like to know which route really works and works best?

I thought you would get a warning saying returning address of local pointer or something with that, and then the content of it would be unavailable? I may be wrong, but I really think you would.

you could do like,

char *function(char *key)
{
return key;
}

that should work.

[tommydanger]

I thought you would get a warning saying returning address of local pointer or something with that, and then the content of it would be unavailable? I may be wrong, but I really think you would.

you could do like,

char *function(char *key)
{
return key;
}

that should work.

o_O and that makes any sense ?

You have to allocate memory in the function dynamically via malloc (c) or new (c++)
By now the string will be deleted when the function returns, but at the time of returning the string is still there, then if you try to access that pointer -> pang!

[Waterbottle]

o_O and that makes any sense ?

You have to allocate memory in the function dynamically via malloc (c) or new (c++)
By now the string will be deleted when the function returns, but at the time of returning the string is still there, then if you try to access that pointer -> pang!

what I meant was,

int main()
{
char key[20];
function(key);
}

char *function(char *key)
{
sprintf(key, "hi");
return key;
}

that works, seeing as you pass the address of key to function and then it modifies the content of it and returns the same address..

and I'm aware that my explaining skills are horrible...