ｃ ｗｉｎｄｏｗｓ 自绘

要在C++中进行自绘，需要使用Windows API函数来绘制窗口。下面是一个简单的示例：

#include <Windows.h>

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 注册窗口类
    WNDCLASSEX wc;
    ZeroMemory(&wc, sizeof(wc));
    wc.cbSize = sizeof(wc);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = L"MyWindowClass";
    RegisterClassEx(&wc);

    // 创建窗口
    HWND hwnd = CreateWindowEx(0, L"MyWindowClass", L"自绘窗口", WS_OVERLAPPEDWINDOW, 100, 100, 800, 600, NULL, NULL, hInstance, NULL);

    // 显示窗口
    ShowWindow(hwnd, nCmdShow);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_PAINT:
        {
            // 创建绘图设备
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);

            // 绘制矩形
            RECT rect;
            GetClientRect(hwnd, &rect);
            FillRect(hdc, &rect, (HBRUSH)(COLOR_WINDOW+1));

            // 绘制文本
            SetTextColor(hdc, RGB(255, 0, 0));
            SetBkMode(hdc, TRANSPARENT);
            DrawText(hdc, L"Hello, World!", -1, &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

            // 释放绘图设备
            EndPaint(hwnd, &ps);
        }
        return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

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

这个示例代码创建了一个窗口，并在其中绘制了一个红色的"Hello, World!"文本。绘图过程在WM_PAINT消息处理函数中完成。可以使用其他Windows API函数来绘制各种形状、图像等内容。