Qt + win32 + mingw上的本机Windows API链接问题

问题描述

我正在尝试使用mingw工具集将本机Windows API与Qt一起使用.某些功能存在链接问题.怎么了?这是mingw名称修饰的错误吗?

I am trying to use native windows API with Qt using mingw toolset. There are link problems with some functions. What happens? Is this a bug with mingw name mangling?

#ifdef Q_WS_WIN
    HWND hwnd = QWidget::winId();
    HDC hdcEMF  = CreateEnhMetaFile(NULL, NULL, NULL, NULL ) ;
    Rectangle(hdcEMF,100,100,200,200);
    HENHMETAFILE hemf = CloseEnhMetaFile(hdcEMF);
    OpenClipboard(hwnd);
    EmptyClipboard();
    SetClipboardData(CF_ENHMETAFILE,hemf);
    CloseClipboard();
#else   

错误:

对"CreateEnhMetaFileW @ 16"的未定义引用

undefined reference to `CreateEnhMetaFileW@16'

对"Rectangle @ 20"的未定义引用

undefined reference to `Rectangle@20'

对"CloseEnhMetaFile @ 4"的未定义引用

undefined reference to `CloseEnhMetaFile@4'

推荐答案

函数CreateEnhMetaFileW()和CloseEnhMetaFile()在静态库Gdi32.lib中定义，因此必须确保对此进行链接.尝试在用于编译的命令行末尾添加-lgdi32.如果这样不起作用，则可能必须通过添加-L/path/to/folder/containing/the/library -lgdi32来指定Gdi32.lib的完整路径.

The functions CreateEnhMetaFileW() and CloseEnhMetaFile() are defined in the static library Gdi32.lib, so you have to make sure to link against that. Try adding -lgdi32 to the end of your command line you're using to compile. If that doesn't work, you might have to specify the full path to Gdi32.lib by adding -L/path/to/folder/containing/the/library -lgdi32 instead.

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