C/C++ Programming Help Thread

[Xylem]

Guys.......i didn't post the buttons LTrigger part for asking if i need to use oldpad or not. I just did it to show the general function. I only need to test the 4th brightness, and get it working. I have enough knowledge to know about oldpad. So, i just need someone to help me with the brightness code, and not the controls code.

[coolguy5678]

For oldpad, I do this:

unsigned long keysPressed = (currentPad.Buttons ^ oldPad.Button) & currentPad.Buttons ;

keysPressed will now give you all the keys that have just been pressed. It's simple and efficient.

By the way, what's "int *100" supposed to do?

[Xylem]

I need some help with 4th brightness. Here is my code:

void sceDisplay_driver_9E3C6DC6(int 100,int 0);//a0 0-100,a1 = 0/1 (set to 0) 
#define sceDisplaySetBrightness sceDisplay_driver_9E3C6DC6 
void sceDisplay_driver_31C4BAA8(int *100,int *0); 
#define sceDisplayGetBrightness sceDisplay_driver_31C4BAA8

//later in main loop
if (pad.Buttons & PSP_CTRL_LTRIGGER){
sceDisplayGetBrightness(int *100, int *0) 	//to get brightness, and
sceDisplaySetBrightness(int 100, int 0)           //to set brightness
}

I am obviously not using the right functions or the right values. What is the code i need to use if i want to set the 4th brightness?

Let me quote this again. For the last time, I AM NOT ASKING FOR OLDPAD OR THE CONTROLS FOR BRIGHTNESS, BUT THE FUNCTION FOR THE BRIGHTNESS. HOW IS THAT HARD TO UNDERSTAND?

[yaustar]

void sceDisplay_driver_9E3C6DC6(int 100,int 0);//a0 0-100,a1 = 0/1 (set to 0) 
#define sceDisplaySetBrightness sceDisplay_driver_9E3C6DC6 
void sceDisplay_driver_31C4BAA8(int *100,int *0); 
#define sceDisplayGetBrightness sceDisplay_driver_31C4BAA8

Where the hell are you getting this code from?

[Access_Denied]

Let me quote this again. For the last time, I AM NOT ASKING FOR OLDPAD OR THE CONTROLS FOR BRIGHTNESS, BUT THE FUNCTION FOR THE BRIGHTNESS. HOW IS THAT HARD TO UNDERSTAND?

if(pad.Buttons & PSP_CTRL_LTRIGGER) {
     sceDisplaySetBrightness(100,0);
}

Why is that so hard to understand?

[BlackShark]

How do you set the psp debug text to a different size? / is there a way?

Thank you

[Raphael]

How do you set the psp debug text to a different size? / is there a way?

No.

[Xylem]

Hey,
Listen guys, i am very sorry about my behavior earlier. I was just pretty angry because of the bad grade at school, and i was very sensitive about that (lol, it turned out to be someone else's grade.....teacher made a mistake). Anyways, my point is that my behavior was really bad, and i was being really rude (especially to Yaustar and Access_Denied, who have helped me a lot the past days in coding). Just like to say sorry.
Also, i have one last question. Here is the code:

void sceDisplay_driver_9E3C6DC6(int a0,int a1);//a0 0-100,a1 = 0/1 (set to 0) 
#define sceDisplaySetBrightness sceDisplay_driver_9E3C6DC6
//later in main loop controls
    if(pad.Buttons & PSP_CTRL_LTRIGGER) {
        sceDisplaySetBrightness(100,0);
    }

In that code, what do i need to change to make it work? Do i change the a0 to 100 and a1 to 0? Or do i leave that, but put the 100 and 0 in the set part like i did?

[SuperBatXS]

Hey, i need help with I/O functions. Right now, i am optimizing the code for the G-Pack and trying to make it look more organized and look clean. I need to put all my settings in one file. I know how to read X to Y bytes, but i don't know how to write from X to Y bytes. If anyone could explain or give me the code, then i can understand and learn it. Thanks.

[SG57]

fprintf(FILE *stream, const char * format, ...);

ftw...

[SuperBatXS]

fprintf(FILE *stream, const char * format, ...);

ftw...

Lol, i have no idea what you are saying....if you could give me an example code, i can understand it better. Btw, here is the code for reading the 6th to the 7th character in my g-pack:

char x[7];
char variable[2] = "0";
char variable1[2] = "1";
FILE *credit;
if ((credit = fopen("./files/credit.txt","rb")) == NULL)
{
     printf("There is nothing in this file");
}
x[fread(x, 1, 7, credit)] = 0;
fclose(credit);
x[7]=0;
if(strcmp (variable,x+6) == 0)
        {
        appmain();
        }
if(strcmp (variable1,x+6) == 0)
        {      
        credits();
        }

It reads the 6th to the 7th character (being the 7th character- 9999991 or 9999990). I know how to read it, but how do you write. I had another question about that, why do you need a [2] after the variables i declared. Whenever i put another number in the [-], the program doesn't work...

[Moca]

Lol, i have no idea what you are saying....if you could give me an example code, i can understand it better. Btw, here is the code for reading the 6th to the 7th character in my g-pack:

char x[7];
char variable[2] = "0";
char variable1[2] = "1";
FILE *credit;
if ((credit = fopen("./files/credit.txt","rb")) == NULL)
{
     printf("There is nothing in this file");
}
x[fread(x, 1, 7, credit)] = 0;
fclose(credit);
x[7]=0;
if(strcmp (variable,x+6) == 0)
        {
        appmain();
        }
if(strcmp (variable1,x+6) == 0)
        {      
        credits();
        }

It reads the 6th to the 7th character (being the 7th character- 9999991 or 9999990). I know how to read it, but how do you write. I had another question about that, why do you need a [2] after the variables i declared. Whenever i put another number in the [-], the program doesn't work...

Example code using fprintf

char text[12] = "Hello World";
FILE *d;
if ((d = fopen("ms0:/test.txt", "a+b")) == NULL)
{
     printf("Dest. file could not be opened for writing");
     fclose(d);
     return -1;
}
fprintf(d,"Just like printf but prints to file instead of screen. BTW, %s", text);
fclose(d);

[SG57]

super - You need to learn to use your resources more effectively... A quick google search will give you something similar to what Moca posted.

[SuperBatXS]

Example code using fprintf

char text[12] = "Hello World";
FILE *d;
if ((d = fopen("ms0:/test.txt", "a+b")) == NULL)
{
     printf("Dest. file could not be opened for writing");
     fclose(d);
     return -1;
}
fprintf(d,"Just like printf but prints to file instead of screen. BTW, %s", text);
fclose(d);

Yea, but............what about using it to print numbers instead of letters, or printing to a X to Y position. How come this doesn't work:

char x[7];
char variable1[2] = "0";
credit = fopen ( "./files/credit2.txt" , "wb" );
x[7]=0;
fprintf (credit, x+6, variable1);
fclose (credit);

I am trying to write something in to the 7th character in a file.

[Moca]

Yea, but............what about using it to print numbers instead of letters, or printing to a X to Y position. How come this doesn't work:

char x[7];
char variable1[2] = "0";
credit = fopen ( "./files/credit2.txt" , "wb" );
x[7]=0;
fprintf (credit, x+6, variable1);
fclose (credit);

I am trying to write something in to the 7th character in a file.

:|

INSTEAD OF PRINTING TO THE SCREEN IT PRINTS TO A FILE... Do you know how to use printf :|

fprintf(credit,"x + 6 = %d \n variable1 = %d",x+6,variable1);

or...

sprintf(text,"x + 6 = %d \n variable1 = %d",x+6,variable1);
fprintf(credit,text);

btw, if you want to write to an offset,
fseek(credit,offset,SEEK_ SET);

This goes to the offset that you want. Then write what you want from there.

[BlackShark]

ok, ive asked this before and it was answered so kindly by SG57, but I could not find it again, I searched for at least an hour (not exaggerated) on this thread and could not find it so, (very sorry) but here it goes.

How do I find the last 4 characters of a file (using a filebrowser)? like how would you tell if a file is an .mp3 ?
Thank you, and sorry for asking that twice.

[Moca]

The first thing that comes to mind is fread + strcmp
fseek(file,-4,SEEK_END); // Seeks -4 bytes from the end of the file

Then read the four bytes with fread and store it in a string. Compare the string with "mp3" and if strcmp returns 0, they are equal.

btw, i guess you could read the header of every file in a directory then work from there.

[SuperBatXS]

The first thing that comes to mind is fread + strcmp
fseek(file,-4,SEEK_END); // Seeks -4 bytes from the end of the file

Then read the four bytes with fread and store it in a string. Compare the string with "mp3" and if strcmp returns 0, they are equal.

btw, i guess you could read the header of every file in a directory then work from there.

Lol, believe it or not, i was asking you guys the wrong question. Sorry for all the trouble. What i actually wanted to do was write only one character in a certain place in a file (like write a 0 instead of 6 in "1234567", etc.). I learned that you need SEEK_END to set the origin where you need to replace the character. I know how to do it now, but sorry for asking you guys the wrong question. I myself was confused, and probably made you guys confused as well. :o

[Access_Denied]

Lol, believe it or not, i was asking you guys the wrong question. Sorry for all the trouble. What i actually wanted to do was write only one character in a certain place in a file (like write a 0 instead of 6 in "1234567", etc.). I learned that you need SEEK_END to set the origin where you need to replace the character. I know how to do it now, but sorry for asking you guys the wrong question. I myself was confused, and probably made you guys confused as well. :o

Check out the functions on this page, they will greatly help you.

http://www.psp-programming.com/code/...id=c:functions

[SuperBatXS]

Check out the functions on this page, they will greatly help you.

http://www.psp-programming.com/code/...id=c:functions

Yep, your sig is huge. Seriously, i am going to post the code in the C examples thread to help other people who need help with writing blocks of data from X to Y bytes. I got mine to work now. Hint: the origin should be changed, and same for where you want to stop (example- SEEK_END).

[hallo007]

PSP_USB_CONNECTION_ESTABLISHED

what does that mean:

that at the moment a file is transfering to psp?

or that the psp is connected to pc?

[SuperBatXS]

PSP_USB_CONNECTION_ESTABLISHED

what does that mean:

that at the moment a file is transfering to psp?

or that the psp is connected to pc?

I think it's that the psp is connected to the pc.

[hallo007]

oke

sceUsbGetState(void);

does anyone know wich byte of the return is for currently transfering , or doesnt it returns that info?

[SuperBatXS]

Ok, i was wrong. I don't understand how to write X to Y bytes in a file. If anyone could help, that would be great. I tried using this:

char buffer20[] = { '0' };
credit = fopen ( "./files/credit.txt" , "wb" );
fseek(credit, 5, SEEK_END);
fwrite(buffer20, sizeof(buffer20[0]) , sizeof(buffer20), credit);
fclose (credit);

I wanted to replace a 6 with 0 in "1234567". However, when i used it, it gave me "123450". It deleted the 7. I know why, because i did SEEK_END, and the program seeked from the 5 to the 7 because of it. But even when i tried "SEEK_END - 1", it still gave me the same thing. Even when i put 6 instead of SEEK_END, it still gives me a "0" in the whole file.

[Insert_Witty_Name]

Try using SEEK_SET to position from the start of the file.

The second argument of fseek is what you need to alter to get the correct value, not the third argument.

[SuperBatXS]

Try using SEEK_SET to position from the start of the file.

The second argument of fseek is what you need to alter to get the correct value, not the third argument.

I tried:

char buffer20[] = { '0' };
credit = fopen ( "./files/credit.txt" , "wb" );
fseek(credit, SEEK_SET, 5);
fwrite(buffer20, sizeof(buffer20[0]) , sizeof(buffer20), credit);
fclose (credit);

and:

char buffer20[] = { '0' };
credit = fopen ( "./files/credit.txt" , "wb" );
fseek(credit, 5, SEEK_SET);
fwrite(buffer20, sizeof(buffer20[0]) , sizeof(buffer20), credit);
fclose (credit);

The first one gave me a "0", and the second one gave me a "123450". How do i make it so it gives me a "1234507"?

[Archaemic]

fseek(credit, 5, SEEK_SET);

would seek to the offset 5 in the file.
The other one is invalid.

It looks to me like you're truncating the file, but I'm not sure, I've never tried to write to the middle of the file.

[SuperBatXS]

fseek(credit, 5, SEEK_SET);

would seek to the offset 5 in the file.
The other one is invalid.

It looks to me like you're truncating the file, but I'm not sure, I've never tried to write to the middle of the file.

So would you happen to know what to do? I have been testing and patiently waiting for someone to help for hours, and i want to finish this before i do any other optimizations to my shell.

[slicer4ever]

wouldn't writing to the middle of the file overwrite whatevers written there?
which for now you could save whatever is after that point and re-write it after writing whatever you need 2 write there

[hibbyware]

superbatxs

Take a look at...

http://www.cplusplus.com/reference/c...dio/fseek.html

It has example and it should help,