Question

（抱歉我疯狂的英语）我希望使用RTF格式获取Rich Edit中的所有文本，而不是将纯文本添加到变量中。我尝试使用EM_STREAMOUT的SendMessage（）直接将Rich Edit写入文件，但我无法将内容保存到特定变量，例如LPWSTR。请记住，只有Win API，而不是MFC。谢谢你的帮助！

Answer 1

您可以将变量传递给EM_STREAMOUT回调，以便根据需要进行更新，例如：

DWORD CALLBACK EditStreamOutCallback(DWORD_PTR dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
    std::stringstream *rtf = (std::stringstream*) dwCookie;
    rtf->write((char*)pbBuff, cb);
    *pcb = cb;
    return 0;
}

std::stringstream rtf;

EDITSTREAM es = {0};
es.dwCookie = (DWORD_PTR) &rtf;
es.pfnCallback = &EditStreamOutCallback; 
SendMessage(hRichEditWnd, EM_STREAMOUT, SF_RTF, (LPARAM)&es);

// use rtf.str() as needed...

更新：将RTF数据加载到RichEdit控件中，使用EM_STREAMIN，例如：

DWORD CALLBACK EditStreamInCallback(DWORD_PTR dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
    std::stringstream *rtf = (std::stringstream*) dwCookie;
    *pcb = rtf->readsome((char*)pbBuff, cb);
    return 0;
}

std::stringstream rtf("...");

EDITSTREAM es = {0};
es.dwCookie = (DWORD_PTR) &rtf;
es.pfnCallback = &EditStreamInCallback; 
SendMessage(hRichEditWnd, EM_STREAMIN, SF_RTF, (LPARAM)&es);

Answer 2

使用EM_STREAMOUT消息就是答案。

这是我可以构建来演示的最简单的例子。这会将丰富的编辑控件的内容保存到文件中。

DWORD CALLBACK EditStreamOutCallback(DWORD_PTR dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
    HANDLE hFile = (HANDLE)dwCookie;
    DWORD NumberOfBytesWritten;
    if (!WriteFile(hFile, pbBuff, cb, &NumberOfBytesWritten, NULL))
    {
        //handle errors
        return 1;
        // or perhaps return GetLastError();
    }
    *pcb = NumberOfBytesWritten;
    return 0;
}

void SaveRichTextToFile(HWND hWnd, LPCWSTR filename)
{
    HANDLE hFile = CreateFile(filename, GENERIC_WRITE, 0, NULL,
        CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE)
    {
        //handle errors
    }
    EDITSTREAM es = { 0 };
    es.dwCookie = (DWORD_PTR) hFile;
    es.pfnCallback = EditStreamOutCallback; 
    SendMessage(hWnd, EM_STREAMOUT, SF_RTF, (LPARAM)&es);
    CloseHandle(hFile);
    if (es.dwError != 0)
    {
        //handle errors
    }
}

如何从Rich Edit Win API获取RTF格式的文本？

2 个答案: