用c语言完成电子秒表显示器的代码

以下是一个简单的电子秒表显示器的示例代码，使用C语言编写，并使用了Windows API来控制窗口和计时器：

#include <windows.h>

#define TIMER_ID 1
#define TIMER_INTERVAL 10

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    TCHAR szClassName[] = TEXT("Stopwatch");
    TCHAR szWindowName[] = TEXT("Stopwatch");

    WNDCLASS wndClass = { 0 };
    wndClass.lpfnWndProc = WndProc;
    wndClass.hInstance = hInstance;
    wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wndClass.lpszClassName = szClassName;

    if (!RegisterClass(&wndClass)) {
        MessageBox(NULL, TEXT("Window registration failed!"), szWindowName, MB_ICONERROR);
        return 0;
    }

    HWND hWnd = CreateWindow(szClassName, szWindowName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 400, 200, NULL, NULL, hInstance, NULL);
    if (!hWnd) {
        MessageBox(NULL, TEXT("Window creation failed!"), szWindowName, MB_ICONERROR);
        return 0;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

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

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    static int hours = 0, minutes = 0, seconds = 0, milliseconds = 0;
    switch (message) {
    case WM_CREATE:
        SetTimer(hWnd, TIMER_ID, TIMER_INTERVAL, NULL);
        break;

    case WM_TIMER:
        milliseconds += TIMER_INTERVAL;
        if (milliseconds >= 1000) {
            milliseconds -= 1000;
            seconds++;
        }
        if (seconds >= 60) {
            seconds -= 60;
            minutes++;
        }
        if (minutes >= 60) {
            minutes -= 60;
            hours++;
        }
        InvalidateRect(hWnd, NULL, TRUE);
        break;

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

        TCHAR buffer[50];
        wsprintf(buffer, TEXT("%02d:%02d:%02d.%03d"), hours, minutes, seconds, milliseconds);
        TextOut(hdc, 10, 10, buffer, lstrlen(buffer));

        EndPaint(hWnd, &ps);
    }
    break;

    case WM_DESTROY:
        KillTimer(hWnd, TIMER_ID);
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }

    return 0;
}

该代码创建了一个窗口，然后使用计时器每10毫秒更新一次窗口，并在窗口中显示一个简单的秒表计时器。使用`hours`，`minutes`，`seconds`和`milliseconds`变量来跟踪经过的时间，然后在`WM_TIMER`消息中更新这些变量，并在`WM_PAINT`消息中使用`TextOut`函数将它们显示在窗口中。