Using libusb-1.0 with Qt (MinGW) in Windows 8

[flammmable]

Hello!
I try to connect device (STM32-Nucleo) with PC via USB.
I have downloaded Qt-5.7.0 with MinGW-5.3.0 and libusb-1.0.20.

(folders of libusb-1.0.20)

libusb-1.0.20
    examples
    include
        libusb-1.0
            libusb.h
    MinGW32
        dll
            libusb-1.0.dll
            libusb-1.0.dll.a
        static
            libusb-1.0.a
    MinGW64
    MS32
    MS64
    libusb-1.0.def
    README.txt

libusb-1.0.20
    examples
    include
        libusb-1.0
            libusb.h
    MinGW32
        dll
            libusb-1.0.dll
            libusb-1.0.dll.a
        static
            libusb-1.0.a
    MinGW64
    MS32
    MS64
    libusb-1.0.def
    README.txt

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1. I have created an empty project
2. added to .pro

INCLUDEPATH += C:\Qt\libusb-1.0.20\include\libusb-1.0\
LIBS += C:\Qt\libusb-1.0.20\MinGW32\static\libusb-1.0.a

INCLUDEPATH += C:\Qt\libusb-1.0.20\include\libusb-1.0\
LIBS += C:\Qt\libusb-1.0.20\MinGW32\static\libusb-1.0.a

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3. added to main.cpp

#include <libusb.h>

#include <libusb.h>

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(then autosubstitution showed functions from libusb)

4. added call of libusb_init(NULL);

int main(int argc, char *argv[])
{
    libusb_init(NULL);
 
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec();
}

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

    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

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But. There is an error
In function `Z5qMainiPPc':
undefined reference to `libusb_init@4'

Can someone tell me where I'm going wrong?

[anda_skoa]

The LIBS variable is usually an -L directive with the directory the library is in and an -l directive with the library name (without any extension of lib prefix)

So maybe try

LIBS += -L C:\Qt\libusb-1.0.20\MinGW32\static -l usb-1.0

LIBS += -L C:\Qt\libusb-1.0.20\MinGW32\static -l usb-1.0

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Cheers,
_

[Radek]

... moreover, libusb is a C library. I include in my C++ code (Debian here! Patch to your Windows!):

extern "C"
{
  #include <libusb-1.0/libusb.h>
}

extern "C"
{
  #include <libusb-1.0/libusb.h>
}

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most likely, replace "libusb-1.0" with "libusb-1.0.20" and remove the INCLUDEPATH addition. Moreover, in Debian, accessing a USB device needs root privileges so that bye bye debugger.