C/C++ Programming Help Thread

[Moonchild]

You need that doc thingy thing for the pspsdk to install the docs though...

[Insert_Witty_Name]

To answer a few off the last posts....

Doxygen is that doc thingy ;)

'remove' or 'unlink' works fine.

The sceIo* functions are in at least one sample, see samples/kernel/fileio for one.

I'd recommend using the newlib variants though over the SDK versions.

[Lukeson]

hmm, what is newlib? Google doesn't really say much on this

[Insert_Witty_Name]

http://en.wikipedia.org/wiki/Newlib

When I say newlib variants, I mean the regular stdio functions, see here:

http://www.cplusplus.com/ref/cstdio/

[xart]

Can any one tell me what sceAudioOutputPannedBlock ing dose exacly

it is not documented and am currently using sceAudioOutputPanned for audio out, and need to now play longer sample files and was looking at this funtion sceAudioOutputPannedBlock ing and needed to know what it ment exacly by blocking.

[Lukeson]

Thanks Inso

Another short question, hope I'm not beginning to get on yer nerves:

Can you only free() variables that have been declared using xalloc? And, I'm pretty sure it is the case, but just wanna -know- it - do (non-static) variables get freed automatically at the end of a function?

[Insert_Witty_Name]

You can only free allocated memory yes.

Variables declared within a function only exist until that function ends.

[Lukeson]

You can only free allocated memory yes.

Thanks

Variables declared within a function only exist until that function ends.

By now I find my question more than embarrassing.

[PSP-Maniac]

hehe i also had a few errors because of variables inside functions hehe

[Lukeson]

question on fgets: I read a file artists.txt which contains:

1234567890
A perfect Circle

using this code

	FILE *f = fopen("artists.txt", "r");
	fgets(timestamp, 16, f);
	fclose (f);

timestamp then contains "1234567890♪"

How do I get rid of that last symbol?

PS: I wrote that file using windows, is that symbol probably a fragment of the widows-carriage-return?

[Insert_Witty_Name]

Yeah I seem to remember it's the \r or something.

Instead of saving the end of line as ending \n, it's saved as \r\n, or something like that.

Try it with a different editor, I seem to remember that one of the native Windows applications saves it how we need it.

[PSP-Maniac]

it is a command to go to the next lin i think you can hex edit it away

[Lukeson]

I am confused; I'm trying to send a list of artists that I read from a file via TCP to the PSP and save it there as a file again. The problem is, the transferred list isn't complete. Im having length-outputs in the server and the client, but it confuses me even more:

Server Code (read file and send string-length and contents):

		pFile = fopen ( "artists.txt" , "rb" );
		fseek (pFile , 0 , SEEK_END);
		lSize = ftell (pFile);
		rewind (pFile);
		buffer = (char*) malloc (lSize); 
		fread (buffer,1,lSize,pFile);
		fclose (pFile);

		printf("Sending artist-list-length (");
		sprintf(answer_l, "%i", strlen(buffer));
		printf("%s)\n", answer_l);
		rc=send(sock,answer_l,strlen(answer_l),0);

		printf("Sending list of artists...\n");
		if (rc=send(sock,buffer,strlen(buffer),0) != strlen(buffer)) {
			printf("send different lenghts; buffer=%i rc=%i\n", strlen(buffer), rc);
		}

		printf("sizeof(buf)=%i strlen(buf)=%i rc=%i\n", sizeof(buffer), strlen(buffer), rc);

Client code (recive length and contents and write to file):

		if((rc = recv(socket, artist_list_length_c, 8,0)) < 0) {
			printf("Error while recieving the artist-list-length; error-code: %s\n",strerror(errno));
			return 0;
		}
		if(rc==0) {
			printf("Client has closed the connection before sending the artist-list-length\n");
			return 0;
		}

		artist_list_length_c[rc]='\0';
		artist_list_length = atoi(artist_list_length_c);
		artist_list_length++;

		char buf[artist_list_length];


		// Recieve artist-list
		rc = recv(socket,buf,artist_list_length,0);
		if(rc==0)
		{
			printf("Server has closed the connnection before sending the artist-list\n");
			return 0;
		}
		if(rc==SOCKET_ERROR)
		{
			printf("Error: recv, error-code: %s\n",strerror(errno));
			return 0;
		}
		buf[rc]='\0';

		printf("sizeof(buf)=%i strlen(buf)=%i\n", sizeof(buf), strlen(buf));

		f = fopen("artists.txt", "w+");
		fprintf(f, "%s\n%s", timestamp_server, buf);
		fclose(f);

The Server output is:

Sending artist-list-length (5180)
Sending list of artists...
sizeof(buf)=4 strlen(buf)=5180 rc=0

The Client output is:

sizeof(buf)=5181 strlen(buf)=1448

I'm really confused

PS: I checked the file on the PSP and visually judging it, it could be ~1448 chars
-= Double Post =-
Is there probalby a maximum length in send or recieve?
-= Double Post =-
Ok, I'll just accept that it doesn't work with such a long string (probably because you can't send a string longer than 1448 chars) so I'll have to split it. Does anyone know how to do this (split a string at X bytes)?
-= Double Post =-
Nevermind, it's easy to split strings.. afer all it's an array so that'll be no problem
-= Double Post =-
Can you somewhere find out what the current MTU is?
-= Double Post =-
The german wikipedia says typical MTU for ethernet is 1500... that could be it!

However I thought the socket would do the MTU/splitting-job?!

[Moonchild]

However I thought the socket would do the MTU/splitting-job?!

Apparently not
I don't know much about network/wifi coding so I won't be able to help

[Lukeson]

СУ&am from psp-programming.com answered this issue. You can send any length of bytes but that doesn't mean that you'll recieve it as one chunk. You have to use a loop and recive until recv returns 0.
-= Double Post =-
...but that doesn't mean it's the end of troubles! The output now is

sizeof(recievedMessage)=5 181 strlen(recievedMessage)=8101

and in the middle of the file there's a line like

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ[...a thousand more...]ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿ

no idea why
-= Double Post =-
^^ I forgot the code:

		printf("waiting to recieve artists\n");
		// Recieve artist-list-length
		if((rc = recv(socket, artist_list_length_c, 8,0)) < 0) {
			printf("Error while recieving the artist-list-length; error-code: %s\n",strerror(errno));
			return 0;
		}
		if(rc==0) {
			printf("Client has closed the connection before sending the artist-list-length\n");
			return 0;
		}

		artist_list_length_c[rc]='\0';
		artist_list_length = atoi(artist_list_length_c);
		artist_list_length++;

		char recievedMessage[artist_list_length];
		char buf[artist_list_length];


		// Recieve artist-list
		while(rc!=SOCKET_ERROR)
		{
			rc = recv(socket,buf,artist_list_length,0);
			if(rc==0)
			{
				printf("Server stopped sending\n");
				break;
			}
			if(rc==SOCKET_ERROR)
			{
				printf("Error: recv, error-code: %s\n",strerror(errno));
				break;
			}
			buf[rc]='\0';
			strcat(recievedMessage, buf);
		}
		//recievedMessage[artist_list_length]='\0';

		printf("sizeof(recievedMessage)=%i strlen(recievedMessage)=%i\n", sizeof(recievedMessage), strlen(recievedMessage));

		f = fopen("artists.txt", "w+");
		fprintf(f, "%s\n%s", timestamp_server, recievedMessage);
		fclose(f);

[FireMonkey]

Im trying to make my second actual program using this guide but I don't know what's wrong with my code. The guide isnt specific on where to put each string of code. Can someone help me out by re arranging my code so it works and just telling me what I did wrong please?

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


PSP_MODULE_INFO("Counter", 0, 1, 1);

/* 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);
          sceKernelRegisterExitCallback(cbid);
          sceKernelSleepThreadCB();
          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;
          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }
          return thid;
}

int main() {
    SetupCallbacks();
int counter = 0;
int i = 0;
    SceCtrlData pad;
    printf("Press [X] To Start the Timer");
    while(1) {
    sceCtrlReadBufferPositive(&pad, 1);
    if(pad.Buttons & PSP_CTRL_CROSS) {
                break;
          }
}
     while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_CIRCLE) {
                    break;
          } 
    pspDebugScreenInit();
    pspDebugScreen
    sceKernelSleepThread();
    printf("Press [O] To Stop the Timer\n");
    printf("Counter: %i", counter);
    counter++;
    for(i=0; i<5; i++) {
                    sceDisplayWaitVblankStart();
          }
    pspDebugScreenClear();
    printf("Counter Finished.");
    printf("Final Count: %i", counter);
    return 0;
}

[Access_Denied]

I'm trying to port my first C game to PSP. It's a very simple game, only like 2 pages of code. But I need to know the equivelent of fflush(); on the PSP. Does anyone know? Also, how do I make the PSP wait for any button to be pressed, then continue?

[FireMonkey]

This guide explains how to make the psp wait for the button to be pressed. :)

[Access_Denied]

This guide explains how to make the psp wait for the button to be pressed. :)

OK, I see now. Now I just need my other question answered.

[Lukeson]

But I need to know the equivelent of fflush(); on the PSP.

psp-programming.com says there is fflush() in the PSPSDK...

[Moonchild]

Yeah, the sdk has newlib. So fflush should be the same as on a Pc.

[FireMonkey]

Im trying to make my second actual program using this guide but I don't know what's wrong with my code. The guide isnt specific on where to put each string of code. Can someone help me out by re arranging my code so it works and just telling me what I did wrong please?

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


PSP_MODULE_INFO("Counter", 0, 1, 1);

/* 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);
          sceKernelRegisterExitCallback(cbid);
          sceKernelSleepThreadCB();
          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;
          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }
          return thid;
}

int main() {
    SetupCallbacks();
int counter = 0;
int i = 0;
    SceCtrlData pad;
    printf("Press [X] To Start the Timer");
    while(1) {
    sceCtrlReadBufferPositive(&pad, 1);
    if(pad.Buttons & PSP_CTRL_CROSS) {
                break;
          }
}
     while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_CIRCLE) {
                    break;
          } 
    pspDebugScreenInit();
    pspDebugScreen
    sceKernelSleepThread();
    printf("Press [O] To Stop the Timer\n");
    printf("Counter: %i", counter);
    counter++;
    for(i=0; i<5; i++) {
                    sceDisplayWaitVblankStart();
          }
    pspDebugScreenClear();
    printf("Counter Finished.");
    printf("Final Count: %i", counter);
    return 0;
}

Still need help with this

[Lukeson]

Does anyone have an idea why my psp freezes? http://forums.qj.net/f-psp-developme...ml#post1100739
Sorry for the nagging, but in this 1-thread-'solution' things are being forgotten so easily when they are not on the last page anymore
-= Double Post =-

    for(i=0; i<5; i++) {
                    sceDisplayWaitVblankStart();
          }
    pspDebugScreenClear();
    printf("Coun

Missing a }, check the tutorial

[FreePlay]

int main() {
    SetupCallbacks();
int counter = 0;
int i = 0;
    SceCtrlData pad;
    printf("Press [X] To Start the Timer");
    while(1) {
    sceCtrlReadBufferPositive(&pad, 1);
    if(pad.Buttons & PSP_CTRL_CROSS) {
                break;
          }
}
     while(1) {
          sceCtrlReadBufferPositive(&pad, 1);
          if(pad.Buttons & PSP_CTRL_CIRCLE) {
                    break;
          } 
    pspDebugScreenInit();
    pspDebugScreen
    sceKernelSleepThread();
    printf("Press [O] To Stop the Timer\n");
    printf("Counter: %i", counter);
    counter++;
    for(i=0; i<5; i++) {
                    sceDisplayWaitVblankStart();
          }
    pspDebugScreenClear();
    printf("Counter Finished.");
    printf("Final Count: %i", counter);
    return 0;
}

Here's the problem: You're using printf before pspDebugScreenInit(). You have to call this before doing anything with the output screen. Also, you have

    pspDebugScreenInit();
    pspDebugScreen
    sceKernelSleepThread();

The second line is an incomplete command, and the third one needs an argument (the number of microseconds to sleep - e.g. 1000000 = 1 second). There might be more, but that's what I saw at a brief glance.

[Moonchild]

Pretty sure this should work

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

#define printf pspDebugScreenPrintf

PSP_MODULE_INFO("Counter", 0, 1, 1);

/* 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);
          sceKernelRegisterExitCallback(cbid);
          sceKernelSleepThreadCB();
          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;
          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }
          return thid;
}

int main() {
    SetupCallbacks();
    
    pspDebugScreenInit();
    
    int counter = 0;
    int i = 0;
    SceCtrlData pad;
    printf("Press [X] To Start the Timer");
    while(1) {
      sceCtrlReadBufferPositive(&pad, 1);
      if(pad.Buttons & PSP_CTRL_CROSS) {
        break;
      }
    }
    while(1) {
      sceCtrlReadBufferPositive(&pad, 1);
      if(pad.Buttons & PSP_CTRL_CIRCLE) {
        break;
      } 
       
      pspDebugScreenClear();
      printf("Press [O] To Stop the Timer\n");
    	printf("Counter: %i", counter);
    	counter++;
    	for(i=0; i<5; i++) {
      	sceDisplayWaitVblankStart();
    	}
    }
    pspDebugScreenClear();
    printf("Counter Finished.");
    printf("Final Count: %i", counter);
    return 0;
}

EDIT: You never defined printf either, I believe that could cause some problems.

[Lukeson]

The correct version would be

    for(i=0; i<5; i++) {
                    sceDisplayWaitVblankStart();
          }
    }
    pspDebugScreenClear();
    printf("Coun

-= Double Post =-
PS http://forums.qj.net/f-psp-developme...ml#post1100739

[FireMonkey]

Thanks, homer. That worked perfectly :) I have a feeling I will need to use this thread often now that I am getting started with programming. Thanks for your help.

[Moonchild]

Thanks, homer. That worked perfectly :) I have a feeling I will need to use this thread often now that I am getting started with programming. Thanks for your help.

Don't overuse it though. You learn alot more by trying to solve your problems yourself *wink to Lukeson*

[Insert_Witty_Name]

...and the third one needs an argument (the number of microseconds to sleep - e.g. 1000000 = 1 second).

You're getting your functions mixed up.

sceKernelSleepThread() requires no arguments and puts the thread to sleep. sceKernelDelayThread(x) will delay the thread for x amount of microseconds (1000000 microseconds in a second).

[Lukeson]

http://forums.qj.net/f-psp-developme...ml#post1100739
Sorry again for reposting this, it's just this one-thread-solution sucks so hard, everything that's not on the last page is just lost :?

-= Double Post =-

I commented out lines and found out the PSP freezes due to strcat(recievedMessage, buf); (recieved message has the size 5181 and the strlen 8101 (can somebody tell me why?), for some reason the PSP doesn't freeze whe cat-ing the string, but when exiting the function (=when trying to free recievedMessage?). Does anyone have an idea how to fix this? How would you merge the parts of the string?
-= Double Post =-
Ok, the problem again was that recievedMessage was initialized but not declared... .