Function crypt32::CryptMsgOpenToEncode

pub unsafe extern "system" fn CryptMsgOpenToEncode(
    dwMsgEncodingType: DWORD, 
    dwFlags: DWORD, 
    dwMsgType: DWORD, 
    pvMsgEncodeInfo: *mut c_void, 
    pszInnerContentObjID: LPSTR, 
    pStreamInfo: PCMSG_STREAM_INFO
) -> HCRYPTMSG