Link VISA library with Qt

Question

Hi,
I’m developing a GUI with Qt to control some oscilloscopes from LeCroy. For communication via Ethernet I want to use the VISA library.
I’ve written some code to test the communication channel but it just won’t compile. Here a short list of what I’ve already tried to make it run:
- copied project to C:\Temp to avoid space problems within the path
- used visa32.lib and visa64.lib
- copied libraries to the project folder
- linked libraries static and dynamic
The result or the copied library into the project folder is:
Fehler: No rule to make target 'C:/path…', needed by 'debug\KommunikationOszi3.exe'. Stop.
And the result with the “original” library is:
Fehler: error: Files/IVI: No such file or directory
Fehler: error: Foundation/VISA/Win64/Lib_x64/msc/: No such file or directory
The link commands in the project files are:
 lib within project folder
win32: LIBS += -L$$PWD/ -lvisa32
INCLUDEPATH += $$PWD/
DEPENDPATH += $$PWD/
lib in the original folder:
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../Program Files/IVI Foundation/VISA/Win64/Lib_x64/msc/ -lvisa32
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../Program Files/IVI Foundation/VISA/Win64/Lib_x64/msc/ -lvisa32d
INCLUDEPATH += $$PWD/../../Program Files/IVI Foundation/VISA/Win64/Lib_x64/msc
DEPENDPATH += $$PWD/../../Program Files/IVI Foundation/VISA/Win64/Lib_x64/msc
And some code examples from my program:
Header file of the oscilloscope class
#ifndef LECROYWAVESURFER_H
#define LECROYWAVESURFER_H
#include <string>
#include <sstream>
#include <iomanip>
#include "visa.h"
class LeCroyWavesurfer
public:
LeCroyWavesurfer(ViSession *defaultRM, std::string name = "", std::string ip = "0.0.0.0");
~LeCroyWavesurfer();
// communication functions
void write(std::string command, std::string logMsg);
std::string read(std::string command, std::string logMsg, ViUInt32 datLength);
// configuring oscilloskop
void autoSetup(std::string channel);
private:
std::string name;
// for VISA-communication
ViSession *defaultRM; // connection to main VISA driver
ViSession session; // connection to device
ViStatus status; // communication status
ViUInt32 retCount; // retur count from string I/O
#endif // LECROYWAVESURFER_H
Some extracts frome the CPP file of the oscilloscope class
#include "leCroyWavesurfer.h"
// Includes for code completion
#include <QDebug>
// Constructor
LeCroyWavesurfer::LeCroyWavesurfer(ViSession *defaultRM, std::string name, std::string ip)
this->name = name;
this->defaultRM = defaultRM;
qDebug() << "Connection to Wafesurfer" << name.c_str();
std::string geraet = "VICP::" + ip;
status = viOpen(*defaultRM, (ViRsrc)geraet.c_str(), VI_NULL, VI_NULL, &session);
if (status < VI_SUCCESS) qDebug() << "Connecting to" << name.c_str() << "failed";
qDebug() << "Setting time out for communication with" << name.c_str();
status = viSetAttribute(session, VI_ATTR_TMO_VALUE, 500);
if (status < VI_SUCCESS) qDebug() << "Setting time out failed";
// Destructor
LeCroyWavesurfer::~LeCroyWavesurfer()
qDebug() << "Disconnecting from" << name.c_str();
status = viClose(session);
if (status < VI_SUCCESS) qDebug() << "Disconnecting from" << name.c_str() << "failed";
delete this;
// Writing command to oscilloscope
void LeCroyWavesurfer::write(std::string command, std::string logMsg)
// creating log message for debugging
qDebug() << logMsg.c_str();
qDebug() << "Sent command:" << command.c_str();
status = viWrite(session, (ViBuf)command.c_str(), command.length(), &retCount);
if (status < VI_SUCCESS) qDebug() << logMsg.c_str() << "failed";
// activating auto setup for chosen channel
void LeCroyWavesurfer::autoSetup(std::string channel)
// command syntax: <channel> : Auto_SETup [FIND]
// <channel> : = {C1, C2, C3, C4}
// If the FIND keyword is present, gain and offset adjustments will be performed
// only on the specified channel.
// In the absence of the FIND keyword, the normal auto-setup will be performed,
// regardless of the <channel> prefix.
std::string command = "C" + channel + " : Auto_SETup FIND";
std::string logMsg = "Setting auto setup for channel " + channel;
write(command,logMsg);
Qt 5.2.1 runs under Win7. I have a user account not an admin account.
Does anyone know how to fix this problem?
Solved!
Go to Solution.

Answer 1

I don't know why, but with a direct path it works. Should look like this:
# Library for VISA functions
win32: LIBS += "C:/Program Files (x86)/IVI Foundation/VISA/WinNT/lib/msc/visa32.lib"
If you also add the include folder you don't need to copy the visa.h into your project folder.
INCLUDEPATH += "C:/Program Files/IVI Foundation/VISA/Win64/Include"
DEPENDPATH += "C:/Program Files/IVI Foundation/VISA/Win64/Include"