(C++) Win32 API 使用 g++ 返回 "undefined reference to `WinMain@16'" 的示例代码

Question

我正在使用带有 notepad++ 的 G++ 编译器。

我正在学习 windows 的教程，我使用的代码是 windows 教程中的示例代码 (https://docs.microsoft.com/en-us/windows/win32/learnwin32/your-first-windows-program) 我将其粘贴到我的记事本中并尝试编译它，但我收到一条错误消息。

这是代码和消息：

#ifndef UNICODE
#define UNICODE
#endif 

#include <windows.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
    // Register the window class.
    const wchar_t CLASS_NAME[]  = L"Sample Window Class";
    
    WNDCLASS wc = { };

    wc.lpfnWndProc   = WindowProc;
    wc.hInstance     = hInstance;
    wc.lpszClassName = CLASS_NAME;

    RegisterClass(&wc);

    // Create the window.

    HWND hwnd = CreateWindowEx(
        0,                              // Optional window styles.
        CLASS_NAME,                     // Window class
        L"Learn to Program Windows",    // Window text
        WS_OVERLAPPEDWINDOW,            // Window style

        // Size and position
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

        NULL,       // Parent window    
        NULL,       // Menu
        hInstance,  // Instance handle
        NULL        // Additional application data
        );

    if (hwnd == NULL)
    {
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

    // Run the message loop.

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

    return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);



            FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));

            EndPaint(hwnd, &ps);
        }
        return 0;

    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

这是我用来编译的命令（powershell）

PS  g++ main.cpp

这是我在尝试编译 (powershell) 时收到的消息

c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libmingw32.a(main.o):(.text.startup+0xa0): undefined reference to `WinMain@16' collect2.exe: error: ld returned 1 exit status

如果我尝试将 wWinMain 重命名为 WinMain，则会出现错误

main.cpp:9:12: error: conflicting declaration of C function 'int WinMain(HINSTANCE, HINSTANCE, PWSTR, int)' int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
In file included from c:\mingw\include\windows.h:44:0, from main.cpp:5: c:\mingw\include\winbase.h:1263:14: note: previous declaration 'int WinMain(HINSTANCE, HINSTANCE, LPSTR, int)' int APIENTRY WinMain (HINSTANCE, HINSTANCE, LPSTR, int);

如果我尝试使用命令 g++ main.cpp -municode 然后我收到消息

g++.exe: error: unrecognized command line option '-municode'

Answer 1

行

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)

我将 wWinMain 更改为 WinMain 并且我将 PWSTR 更改为 LPSTR 现在可以使用了。我不知道为什么。希望它能帮助任何遇到同样问题的人(-:

(C++) Win32 API 使用 g++ 返回 "undefined reference to `WinMain@16'" 的示例代码

(C++) Win32 API sample code returning "undefined reference to `WinMain@16'" using g++

c++

winapi

g++