imaqDisplayImage return value

[andreag]

Hello,

I am experiencing some problems with the imaqDisplayImage function. When I call it:

//////////////////////////////////////////////

#include "nivision.h"

*

*

*

// Vision variables

static Image* singleImage;

static Image* singleImage_1;

*

*

*

int main (int argc, char *argv[]) {

*

*

*

// Vision

singleImage = imaqCreateImage(IMAQ_IMAGE_I16, 0);

imaqSetImageSize(singleImage, 300, 1);

status = imaqDisplayImage(singleImage, 0, TRUE);

if(status == 0)

{

err=imaqGetErrorText(imaqGetLastError());

sprintf(outputString, "Status: %i\n", status);

WriteString(textout, outputString);

sprintf(outputString, "Error Code: %i\n", imaqGetLastError());

WriteString(textout, outputString);

sprintf(outputString, "Error Description: %c\n", err);

WriteString(textout, outputString);

}

imaqSetWindowTitle(0, "Camera 1");

windowPosition.x = 610;

windowPosition.y = 30;

imaqMoveWindow(0, windowPosition);

singleImage_1 = imaqCreateImage(IMAQ_IMAGE_I16, 0);

}

//////////////////////////////////////////////

The WriteString allows me to be able to read the values of "status", "imaqGetLastError()", and "err":

Status: 0

Error Code: 0

Error Description:

The problem is that although "imaqDisplayImage" fails (it returns a zero), the "imaqGetErrorText" does not give me a proper feedback. In fact, I am not able to have an error description.

I am very confused, any help will be greatly appreciated! 🙂

Thanks!

[jr_2005]

I don't use imaq, but as a guess, where you have:

    sprintf(outputString, "Error Description: %c\n", err);

perhaps try:

    sprintf(outputString, "Error Description: %s\n", err);

instead.

JR

[andreag]

Thank you! Yes, I catched that, too 🙂 But I keep not having an error description. I think the issue is more related to another question I posted on the forum (http://forums.ni.com/ni/board/message?board.id=180&thread.id=42409). For some reasons, if I run the code as an administrator I receive a Windows error message regarding NIVisSvr.exe. While if I run it with no-administartor privileges, the error does not come up at all. This is even more confusing...

Thanks