[Ken Streeter]

Originally Posted by mgoodell6

I have not been able to get the frcWriteImage() function to work. I am using code from the WindRiver camera example but receive a frcWriteImage failed each time I try to save an image. Any help with this would be appreciated.

Here is the code I am using

if ( !GetImage (cameraImage,NULL) ) {
printf ("\nCamera Acquisition failed");
} else {
if (!frcWriteImage(cameraImage, "image.jpeg") ) {
printf ("frcWriteImage failed");
} else {
printf ("\n>>>>> Saved image to %s", "image.jpeg") );
// always dispose of image objects when done
frcDispose(cameraImage);
}
}

My first guess as to the problem is that you may need to supply a full path to the filename. (i.e. /image.jpeg )

Second guess is that you need to allocate storage for cameraImage prior to the above code. (e.g., you need to use "frcCreateImage(IMAQ_IMAGE_HSL)")

Third guess is that way back once upon a time, vxWorks FAT filesystems had problems with file extensions of longer than 3 characters, so switching to a .jpg extension might help.

In any case, as an example of working code, below is the code that we are using to capture snapshots. The below code is "cut and paste" directly out of our code, so it doesn't contain any typos.

void TwoColorTracker::Snapshot() {
	
	Image* cameraImage;
	char funcName[]="Snapshot";
	int retval;
	int errorCode = 0;
	
	// Put image in root directory. If another directory is used
	// it must exist on the cRIO.
	char* imageName = "/viewxxx.png"; 		
	static int imageNum = 1;
	printf("test ");
	// Camera Snapshot code
	if (imageNum < 6 ) {
		printf("test2 ");
		sprintf(imageName,"/view%d.png",imageNum);
		imageNum++;
		//printf("taking a SNAPSHOT ");
		cameraImage = frcCreateImage(IMAQ_IMAGE_HSL);
		if (!cameraImage)  {
			errorCode = GetLastVisionError();
			DPRINTF(LOG_INFO, "Unable to create %s Error = %i %s", imageName, errorCode, GetVisionErrorText(errorCode));
			return;
		}
		
		if ( !GetImage(cameraImage, NULL) ) {
			DPRINTF(LOG_INFO, "\nCamera Acquisition failed %i", GetLastVisionError() );
		} else {
			retval = frcWriteImage(cameraImage, imageName);
			if ( retval ) { 
				printf ("frcWriteImage succeeded.");
			} else {
				//errorCode = GetLastVisionError();
				//DPRINTF(LOG_INFO, "frcWriteImage failed, Error = %i %s", imageName, errorCode, GetVisionErrorText(errorCode));
				printf ("frcWriteImage '%s' failed.", imageName);
			}
		}
		frcDispose(funcName, cameraImage, NULL); 
	}
}