(C++)使用G++返回“对`WinMain@16'的未定义引用”的Win32 API示例代码

Question

#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);
}

PS  g++ main.cpp

C://mingw/bin/../lib/gcc/mingw32/6.3.0/../..//../libmingw32.a(main.o):(.text.startup+0xA0):未定义对`WinMain@16'的引用collect2.exe:错误：ld返回1退出状态

如果尝试将wwinmain重命名为wwinmain，则会出现错误

main.cpp:9:12:错误：C:\mingw\include\windows.h:44:0,from main.cpp:5:C:\mingw\include\winbase.h:1263:14中包含的文件中的C函数'int WinMain(HINSTANCE,HINSTANCE,LPSTR,int)'int WINAPI WinMain(HINSTANCE,HINSTANCE,LPSTR,int）声明冲突：注意：以前的声明'int WinMain(HINSTANCE,HINSTANCE,LPSTR,int）；

如果我尝试使用命令g++main.cpp-municode，那么我会得到以下消息

g++.exe：错误：无法识别命令行选项“-municode”

Answer 1

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