链接器错误:Qt 和 libusb-win32
我尝试开发一个 Qt GUI 应用程序,它将使用 USB 与板进行通信。我使用的库是libusb-win32 v1.2.5.0。
当我编译应用程序时,出现以下错误:
./debug/thread_usb_comm.o:在函数“ZN15thread_usb_comm15find_usb_deviceEtt”中:
thread_usb_comm.cpp:15: 对“usb_find_busses”的未定义引用
thread_usb_comm.cpp:16: 对“usb_find_devices”的未定义引用
thread_usb_comm.cpp:18: 对“usb_get_busses”的未定义引用
thread_usb_comm.cpp:26: 对“usb_open”的未定义引用collect2: ld 返回 1 退出状态
mingw32-make[1]: [debug/CALSYS11_calib_app.exe] 错误 1
mingw32-make:[调试]错误2
应用程序代码是:(
头文件)
#ifndef THREAD_USB_COMM_H
#define THREAD_USB_COMM_H
#include <QThread>
#include <QtDebug>
#include "CALSYS11.h"
#include <lusb0_usb.h>
class thread_usb_comm : public QThread
{
Q_OBJECT
public:
thread_usb_comm();
private:
bool device_connected;
usb_dev_handle *p_usb_device;
bool find_usb_device(
unsigned short vendor_id,
unsigned short product_id
);
};
#endif // THREAD_USB_COMM_H
(源文件)
#include "thread_usb_comm.h"
thread_usb_comm::thread_usb_comm()
{
device_connected = false;
}
bool thread_usb_comm::find_usb_device(
unsigned short vendor_id,
unsigned short product_id
)
{
struct usb_bus *bus;
struct usb_device *dev;
usb_find_busses();
usb_find_devices();
for (bus = usb_get_busses(); bus; bus = bus->next)
{
for (dev = bus->devices; dev; dev = dev->next)
{
if ((dev->descriptor.idVendor == vendor_id) &&
(dev->descriptor.idProduct == product_id))
{
qDebug ("Device found");
p_usb_device = usb_open(dev);
if (0 == p_usb_device)
{
qCritical ("Could not open USB device");
return false;
}
device_connected = true;
return true;
}
}
}
qDebug ("Cannot find specified device");
return false;
}
我在.pro文件中添加了libusb库的链接:
LIBS += -L\path\to\libusb-win32\lib\gcc -lusb
我在 Windows 7 上开发。
谢谢你,
约翰
I try to develop a Qt GUI application which will communicate with a board using USB. The library I use is libusb-win32 v1.2.5.0.
When I compile the application, the following errors occur:
./debug/thread_usb_comm.o: In function `ZN15thread_usb_comm15find_usb_deviceEtt':
thread_usb_comm.cpp:15: undefined reference to 'usb_find_busses'
thread_usb_comm.cpp:16: undefined reference to 'usb_find_devices'
thread_usb_comm.cpp:18: undefined reference to 'usb_get_busses'
thread_usb_comm.cpp:26: undefined reference to 'usb_open'collect2: ld returned 1 exit status
mingw32-make[1]: [debug/CALSYS11_calib_app.exe] Error 1
mingw32-make: [debug] Error 2
The application code is:
(header file)
#ifndef THREAD_USB_COMM_H
#define THREAD_USB_COMM_H
#include <QThread>
#include <QtDebug>
#include "CALSYS11.h"
#include <lusb0_usb.h>
class thread_usb_comm : public QThread
{
Q_OBJECT
public:
thread_usb_comm();
private:
bool device_connected;
usb_dev_handle *p_usb_device;
bool find_usb_device(
unsigned short vendor_id,
unsigned short product_id
);
};
#endif // THREAD_USB_COMM_H
(source file)
#include "thread_usb_comm.h"
thread_usb_comm::thread_usb_comm()
{
device_connected = false;
}
bool thread_usb_comm::find_usb_device(
unsigned short vendor_id,
unsigned short product_id
)
{
struct usb_bus *bus;
struct usb_device *dev;
usb_find_busses();
usb_find_devices();
for (bus = usb_get_busses(); bus; bus = bus->next)
{
for (dev = bus->devices; dev; dev = dev->next)
{
if ((dev->descriptor.idVendor == vendor_id) &&
(dev->descriptor.idProduct == product_id))
{
qDebug ("Device found");
p_usb_device = usb_open(dev);
if (0 == p_usb_device)
{
qCritical ("Could not open USB device");
return false;
}
device_connected = true;
return true;
}
}
}
qDebug ("Cannot find specified device");
return false;
}
I added the link to the libusb library in the .pro file:
LIBS += -L\path\to\libusb-win32\lib\gcc -lusb
I develop on Windows 7.
Thank you,
Johann
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尝试构建发布而不是调试,否则静态库与编译器版本不兼容(当我尝试使用 MinGW 4.4 构建旧静态库时,我遇到了同样的问题)
Try to build release instead of debug or the static library is incompatible with compiler version (I faced same issue when I tried to build old static library with MinGW 4.4)