如何利用WindowsAPI实现一个类似于MessageBox的弹窗但是可以上下滚动

可以使用以下代码实现一个带有垂直滚动条的弹窗：

#include <windows.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 创建窗口
    HWND hWnd = CreateWindow(
        L"WindowClass",
        L"Scrollable Message Box",
        WS_OVERLAPPEDWINDOW | WS_VSCROLL,
        CW_USEDEFAULT, CW_USEDEFAULT, 500, 300,
        NULL, NULL, hInstance, NULL
    );

    // 创建编辑框窗口
    HWND hEdit = CreateWindow(
        L"EDIT",
        NULL,
        WS_CHILD | WS_VISIBLE | WS_VSCROLL | ES_MULTILINE,
        0, 0, 0, 0,
        hWnd, NULL, hInstance, NULL
    );

    // 添加文本内容
    const wchar_t* message = L"This is a scrollable message box.\r\n";
    for (int i = 0; i < 100; i++) {
        SendMessage(hEdit, EM_SETSEL, -1, -1);
        SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)message);
    }

    // 设置滚动条参数
    SCROLLINFO si;
    si.cbSize = sizeof(si);
    si.fMask = SIF_ALL;
    si.nMin = 0;
    si.nMax = 100;
    si.nPage = 10;
    si.nPos = 0;
    SetScrollInfo(hWnd, SB_VERT, &si, TRUE);

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

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

    return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg) {
    case WM_VSCROLL: {
        // 处理滚动条消息
        int nScrollCode = LOWORD(wParam);
        int nPos = HIWORD(wParam);
        switch (nScrollCode) {
        case SB_TOP:
            nPos = 0;
            break;
        case SB_BOTTOM:
            nPos = 100;
            break;
        case SB_LINEUP:
            nPos--;
            break;
        case SB_LINEDOWN:
            nPos++;
            break;
        case SB_PAGEUP:
            nPos -= 10;
            break;
        case SB_PAGEDOWN:
            nPos += 10;
            break;
        case SB_THUMBPOSITION:
        case SB_THUMBTRACK:
            nPos = LOWORD(wParam);
            break;
        }
        nPos = max(0, min(100, nPos));
        SetScrollPos(hwnd, SB_VERT, nPos, TRUE);
        SCROLLINFO si;
        si.cbSize = sizeof(si);
        si.fMask = SIF_POS;
        si.nPos = nPos;
        SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
        return 0;
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

这段代码会创建一个带有垂直滚动条的窗口，窗口中包含一个编辑框窗口用于显示文本内容。您可以根据需要修改窗口大小、文本内容、滚动条参数等。