Is there any way I can see the source code for the snapshot utility in QNX6.5

QNX USERS QNX6 - OS
1

We are working on a project that has similar screen capture capabilities. Viewing the code for the snapshot utility would be very helpful. Would anyone know if this code if public somewhere?

Thanks.

2

To get that source code, you would need to talk with QNX. Mention the word Photon and I suspect that you will get a cold shoulder.

I’ve done work like this with Photon. If you have some questions you can email me at maschoen@pobox.com and I will try to help out.

Snapshot has some pretty sophisticated capabilities, e.g. choosing the whole screen vs. a windows vs. a user described area. If you want something simpler, something that will just grab the screen, I recall (vaguely) that there are Photon calls to do just that.

3

static int do_snapshot(void)
{
PhRect_t screen;
char buf[256];
size_t shsize;
pthread_attr_t attr;
int errno_save, retc = 1, destroy_needed = 1;

/* Do this little bit to allow other apps to repair themselves before
   taking the snapshot */

pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);

if(pthread_create(NULL,&attr,wakeup_caller,(void*)getprio(0)) == EOK)
{
	int old_prio = setprio(0,1);
	sched_yield();
	setprio(0,old_prio);
}

PhWindowQueryVisible(Ph_QUERY_IG_REGION,0,PhInputGroup(NULL),&screen);

if(PhRectIntersect(&capture,&screen) && (shsize = PgReadScreenSize(&capture)))
{
	PhImage_t *img_buf;
	char shname[16];
	static int shcount = 1;

	sprintf(shname,"/snap%08lx",(getpid() << 16) ^ shcount++);
	
	if(img_buf = PgShmemCreate(shsize,shname))
	{
		PhImage_t *image = PgReadScreen(&capture,img_buf);
	
		if(image)
		{
			unsigned short *selection;

			PtGetResource(ABW_send_choice,Pt_ARG_CBOX_SEL_ITEM,&selection,0);

			PtRealizeWidget(ABW_base);

			if(*selection <= 1)
			{
				view_image(shname,shsize,img_buf);
				//
				// The view_image() function handles destruction of the
				// shared memory.
				//
				destroy_needed = 0;
			}
			else
			{
				char *choice;
	
				PtGetResource(ABW_send_choice,Pt_ARG_TEXT_STRING,&choice,0);

				if ((writeFile(image,choice)) != 0) {
                                       char graphics_buf[45];
				   PgVideoModeInfo_t ModeInfo;
			           PgDisplaySettings_t ModeSetting;

                                       if (PgGetVideoMode( &ModeSetting ))
                                          sprintf(graphics_buf, "[Couldn't get current video mode.]");
                                       else {
				      if (PgGetVideoModeInfo(ModeSetting.mode, &ModeInfo))
				         sprintf(graphics_buf, "[Couldn't get current video mode info.]");
                                          else
				         sprintf(graphics_buf, "%dx%dx%d-Bit Color", ModeInfo.width, ModeInfo.height, ModeInfo.bits_per_pixel);
                                       }
                                       sprintf(buf, "Couldn't save file.\n '%s' format does not support the %s graphics setting. Please change your graphics mode or select an alternate format to save.", choice, graphics_buf);
                                       PtNotice(ABW_base,NULL,"Error",NULL,buf,NULL,NULL,NULL,Pt_MODAL);
                                   }
			}
			
			retc = 0;
		}

		errno_save = errno;
		if (destroy_needed)
			PgShmemDestroy(img_buf);
		errno = errno_save;
	}
}

if (retc) {
	PtRealizeWidget(ABW_base);
	sprintf(buf,"Error acquiring image:\n%s",strerror(errno));
	PtNotice(ABW_base,NULL,"Error",NULL,buf,NULL,NULL,NULL,Pt_MODAL);
}
return retc;

}

4

Interesting thanks. Where did you get this/ is it possible that I could access the rest of the code? I’m paticularly interested in this section here:

Would you happen to have the code for this wakeup_caller function?

5

static void *wakeup_caller(void *data)
{
nanosleep(&MAX_TIMEOUT,NULL);
setprio(0,(int)data);
return(NULL);
}

6

I got the source, from QNX, year ago. NDA should prevent me from posting said code but I’m pretty sure they don’t mind posting this insignificant piece of code, of a dead product.