c - 使用主入口点将 HINSTANCE 传递给 WNDCLASS

Question

考虑以下代码:

#include <windows.h>

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

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

    MSG  msg;    
    HWND hwnd;
    WNDCLASSW wc;

    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.lpszClassName = L"Window";
    wc.hInstance     = hInstance;
    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wc.lpszMenuName  = NULL;
    wc.lpfnWndProc   = WndProc;
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);

    RegisterClassW(&wc);
    hwnd = CreateWindowW(wc.lpszClassName, L"Window",
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                100, 100, 350, 250, NULL, NULL, hInstance, NULL);  

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, 0, 0)) {

        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, 
    WPARAM wParam, LPARAM lParam) {

    switch(msg) {

      case WM_DESTROY:

          PostQuitMessage(0);
          break;
    }

    return DefWindowProcW(hwnd, msg, wParam, lParam);
}

这会创建一个空白窗口，我想重现它，但使用 main 入口点而不是 wWinMain。

下面的代码可以工作，但是感觉很hacky:

#include <windows.h>

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

int main(int argc, HINSTANCE argv) {

    MSG  msg;    
    HWND hwnd;
    WNDCLASSW wc;

    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.lpszClassName = L"Window";
    wc.hInstance     = argv;
    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wc.lpszMenuName  = NULL;
    wc.lpfnWndProc   = WndProc;
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);

    RegisterClassW(&wc);
    hwnd = CreateWindowW(wc.lpszClassName, L"Window",
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                100, 100, 350, 250, NULL, NULL, hInstance, NULL);  

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, 0, 0)) {

        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, 
    WPARAM wParam, LPARAM lParam) {

    switch(msg) {

      case WM_DESTROY:

          PostQuitMessage(0);
          break;
    }

    return DefWindowProcW(hwnd, msg, wParam, lParam);
}

有没有更好的办法？

Answer 1

您可以使用 GetModuleHandle(0) 获取 .exe HMODULE/HINSTANCE。

真正的 Windows 入口点没有参数，C 运行时在使用 WinMain 时为您调用 GetModuleHandle。