c++ richedit从下往上换行

要实现C++ RichEdit控件从下往上换行，可以通过设置RichEdit的样式来实现。下面是一个示例代码：

#include <windows.h>
#include <richedit.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static HWND hRichEdit;

    switch (msg)
    {
    case WM_CREATE:
    {
        // 创建RichEdit控件
        hRichEdit = CreateWindowEx(WS_EX_CLIENTEDGE, RICHEDIT_CLASS, NULL, WS_CHILD | WS_VISIBLE | WS_VSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_READONLY,
                                   0, 0, 400, 400, hwnd, NULL, GetModuleHandle(NULL), NULL);

        // 设置RichEdit的样式，使其从下往上换行
        DWORD dwStyle = GetWindowLong(hRichEdit, GWL_STYLE);
        dwStyle &= ~ES_AUTOVSCROLL;  // 禁用自动垂直滚动
        dwStyle |= ES_MULTILINE | ES_AUTOHSCROLL | ES_DISABLENOSCROLL | ES_VERTICAL;  // 设置为多行、自动水平滚动、禁用上下滚动条、垂直文本显示
        SetWindowLong(hRichEdit, GWL_STYLE, dwStyle);
    }
    break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

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

    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc = {0};
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszClassName = "MyClass";

    if (!RegisterClassEx(&wc))
    {
        MessageBox(NULL, "窗口注册失败！", "错误", MB_OK | MB_ICONERROR);
        return 0;
    }

    HWND hwnd = CreateWindowEx(0, "MyClass", "C++ RichEdit从下往上换行", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 500, 500, NULL, NULL, hInstance, NULL);

    if (!hwnd)
    {
        MessageBox(NULL, "窗口创建失败！", "错误", MB_OK | MB_ICONERROR);
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

在上述代码中，创建了一个带有RichEdit控件的窗口，通过设置RichEdit的样式，禁用了自动垂直滚动条，并设置了多行、自动水平滚动、禁用上下滚动条、垂直文本显示的样式，从而实现了从下往上换行的效果