c - 使用主入口点将 HINSTANCE 传递给 WNDCLASS

Question

请考虑以下代码：

#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);
}

这将创建一个空白窗口，我想重现它，但使用 main 入口点而不是wWinMain.

以下代码有效，但感觉很黑客：

#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);
}

有没有更好的方法？

Answer 1

你可以得到.exe HMODULE/HINSTANCE with GetModuleHandle(0) .

真正的 Windows 入口点没有参数，C 运行时调用在使用 WinMain 时会为您GetModuleHandle。