Error when access VISA functions in C code on Windows 7 64bit

Hi,

I am trying to write a simple piece of code in C langage under windows7 64bit to test VISA on a 64bit platform.

---CODE---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "visa.h"

/* Variables */
static char instrDescriptor[VI_FIND_BUFLEN];
static ViUInt32 numInstrs;
static ViFindList findList;
static ViSession defaultRM, instr;
static ViStatus status;

int main(void)
{
/* First we will need to open the default resource manager. */
status = viOpenDefaultRM (&defaultRM);
status = VI_SUCCESS-1;
if (status < VI_SUCCESS)
{
printf("Could not open a session to the VISA Resource Manager!\n");
}

return 0;
}

---END OF CODE---

I am able to compile this piece of code using the visa64.lib and a MinGW GCC compiler under windows.

My problem is that when I start the generated executale file, windows opens a window "test.exe has stopped working".

If I just comment the line where the VISA lib is accessed, the executable file works coorectly.

Someone has an idea to help me ?

regards