windows 窗口消息机制

#include <windows.h>

#define TIMER_ID 1
#define TIMER_INTERVAL 60000  // 1 minute in milliseconds
#define MAX_PATH 260



// 窗口过程函数
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
    case WM_TIMER:
        if (wParam == TIMER_ID) {
            CaptureAndSaveScreenshot();
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProcW(hwnd, msg, wParam, lParam);
    }
    return 0;
}

// 主函数
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) {
    const wchar_t CLASS_NAME[] = L"HiddenWindowClass";

    // 注册窗口类
    WNDCLASSW wc = { 0 };
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;

    RegisterClassW(&wc);

    // 创建窗口
    HWND hwnd = CreateWindowW(
        CLASS_NAME, L"Hidden Window",
        WS_VISIBLE,  // 先创建可见窗口
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, hInstance, NULL
    );

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

    // 隐藏窗口
    ShowWindow(hwnd, SW_HIDE);

    // 设置定时器
    SetTimer(hwnd, TIMER_ID, TIMER_INTERVAL, NULL);

    // 消息循环
    MSG msg = { 0 };
    while (GetMessageW(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }

    return (int)msg.wParam;
}