您可以将变量传递给EM_STREAMOUT
回调,以便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...
Update:要将 RTF 数据加载到 RichEdit 控件中,请使用EM_STREAMIN
, eg:
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);