Question

我目前在Windows上将gdi32.lib包含在我的C项目中时出现问题。错误发生在以下代码段中：

#include <windows.h>
#pragma comment(lib, "kernel32.lib")
#pragma comment(lib, "user32.lib")
#pragma comment(lib, "gdi32.lib")
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    WNDCLASSEX wcx;
    wcx.hbrBackground  = CreateSolidBrush(0x000000);
    ....
}

当我使用-lgdi32选项进行编译时，一切都按预期工作，而我使用以下命令得到编译错误：

C:\projects\cpp>c++ project.cpp
    C:\Users\LUKASW~1\AppData\Local\Temp\ccSKc5qg.o:project.cpp:(.text+0xe0):
        undefined reference to `__imp_CreateSolidBrush'
    collect2.exe: error: ld returned 1 exit status

有没有办法直接在文件中链接库，而不是每次都将它传递给编译器？

以下是用于调试的精简版本：

#include <windows.h>
#pragma comment(lib, "kernel32.lib")
#pragma comment(lib, "user32.lib")
#pragma comment(lib, "gdi32.lib")

static char szWindowClass[] = "debugging";
static char szTitle[] = "gdi32.lib test";

HINSTANCE hInst;
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

void GetDesktopResolution(int& w, int& h) {
    RECT desktop;
    GetWindowRect(GetDesktopWindow(), &desktop);
    w = desktop.right;
    h = desktop.bottom;
}

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    WNDCLASSEX wcx;

    wcx.cbClsExtra     = 0;
    wcx.cbSize         = sizeof(WNDCLASSEX);
    wcx.cbWndExtra     = 0;
    wcx.hbrBackground  = CreateSolidBrush(0x000000);
    wcx.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcx.hIcon          = LoadIcon(hInst, IDI_APPLICATION);
    wcx.hIconSm        = LoadIcon(wcx.hInstance, IDI_APPLICATION);
    wcx.hInstance      = hInst;
    wcx.lpfnWndProc    = WndProc;
    wcx.lpszClassName  = szWindowClass;
    wcx.lpszMenuName   = NULL;
    wcx.style          = CS_HREDRAW | CS_VREDRAW;

    RegisterClassEx(&wcx);

    int x, y,
        w = 600,
        h = 600;
    GetDesktopResolution(x, y);

    HWND hWnd = CreateWindowEx(WS_EX_APPWINDOW, szWindowClass, szTitle, WS_POPUP, (x - w) / 2, (y - h) / 2, w, h, NULL, NULL, hInst, NULL);

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    MSG msg;
    while(GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch (message) {
        case WM_PAINT:
            // empty
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
            break;
    }

    return 0;
}

Answer 1

#pragma comment(lib, ...)是一个MS Visual C / C ++编译指示。您正在使用MinGW，它不支持该指令。

根据我在this question上看到的内容，GCC和G ++没有相同的编译指示，因此您必须坚持使用-l选项。

如何从文件中正确添加gdi32.lib？

1 个答案: