如何获得文本与RTF格式从富编辑赢API

Question

(抱歉我的疯狂英语)我想让所有的文本在富编辑与RTF格式，而不是纯文本到一个变量。我尝试了SendMessage()与EM_STREAMOUT直接写入富编辑文件，但我不能将内容保存到特定的变量，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，以便它可以根据需要进行更新，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:加载RTF数据到richit控件，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消息是答案。

下面是我所能构造的最简单的例子。这将把富编辑控件的内容保存到一个文件中。

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
    }
}