Visual C++ 2005 Sample Program
    Add visa32.lib to the project library when building the following
   sample programs.
    Sample program of setting and queries (USB)


#include "stdio.h" #include "string.h" #include "visatype.h" #include "visa.h" // Serial number of the multifunction generator #define serial "0123456" int main() { ViSession defaultRm, instr; // Create VISA ResourceManager object ViStatus status = viOpenDefaultRM(&defaultRm); if (status < VI_SUCCESS) { // Initialization error return -1; } ViChar rsc[256]; // USB sprintf(rsc, "USB0::0x0D4A::0x000F::%s::INSTR", serial); ViAccessMode accessMode = VI_NO_LOCK; ViUInt32 timeout = 0; // Connect the device viOpen(defaultRm, rsc, accessMode, timeout, &instr); ViUInt32 count; // Set the frequncy as 5.0 kHz, and ask the value ViBuf buf = (ViBuf)":FREQ 5000;:FREQ?\n"; viWrite(instr, buf, (ViUInt32)strlen((ViPChar)buf), &count); ViChar result[257]; viRead(instr, (ViPBuf)result, 256, &count); result[count] = 0; printf("result=[%s]\n", result); // Close the device viClose(instr); viClose(defaultRm); return 0; }

Sample program of setting and queries (GPIB) #include "stdio.h" #include "string.h" #include "math.h" #include "visatype.h" #include "visa.h" int main() { ViSession defaultRm, instr; // Create VISA ResourceManager object ViStatus status = viOpenDefaultRM(&defaultRm); if (status < VI_SUCCESS) { // Initialization error return -1; } ViChar rsc[256]; // (GPIB address:2) strcpy(rsc, "GPIB0::2::INSTR"); ViAccessMode accessMode = VI_NO_LOCK; ViUInt32 timeout = 0; // Connect the device viOpen(defaultRm, rsc, accessMode, timeout, &instr); ViUInt32 count; // Set the Offset as 0.0V, Amplitude as 20.0Vp-p and Output as on, // and ask the value ViBuf buf = (ViBuf)":SOUR1:VOLT:OFFS 0V;:SOUR1:VOLT 20VPP;OUTP1 1;:SOUR1:VOLT?"; viWrite(instr, buf_rst, (ViUInt32)strlen((ViPChar)buf_rst), &count); ViChar result[257]; viRead(instr, (ViPBuf)result, 256, &count); result[count] = 0; printf("result=[%s]\n", result); // Close the device viClose(instr); viClose(defaultRm); return 0; }