我找到了一种无需使用 FtpGetFile 即可下载文件的方法。我希望这段代码可以帮助某人:
bool RetrieveFile(const string& strSource, const string& strTarget) {
/* The handle for the transfer */
HINTERNET hTransfer = NULL;
/*
* Set default error
*/
DWORD error = ERROR_SUCCESS;
if( !isConnected ) {
debug("%s(): ERROR not connected\n", __FUNCTION__);
return false;
}
/* Initiate access to a remote FTP connection */
hTransfer = FtpOpenFile(hFtpSession, strSource.c_str(), GENERIC_READ,
FTP_TRANSFER_TYPE_BINARY, 0);
if(hTransfer) {
std::ofstream myostream(strTarget.c_str(), std::ios::binary);
if ( myostream.is_open() ) {
static const DWORD SIZE = 1024;
BYTE data[SIZE];
DWORD size = 0;
do {
BOOL result = InternetReadFile(hTransfer, data, SIZE, &size);
if ( result == FALSE ) {
error = GetLastError();
Debug("InternetReadFile(): %lu\n", error);
}
myostream.write((const char*)data, size);
}
while ((error == ERROR_SUCCESS) && (size > 0));
// Close the stream
myostream.close();
}
else {
Debug("Could not open '%s'.\n", strTarget.c_str());
error = ERROR_FILE_NOT_FOUND; // Not necessarily not found, but it is to describe a file error which is different from ERROR_SUCCESS
}
// Close
const BOOL result = InternetCloseHandle(hTransfer);
if ( result == FALSE ) {
const DWORD error = GetLastError();
debug("InternetClose(): %lu\n", error);
}
/* Check error status of the process */
return (error == ERROR_SUCCESS);
}
DWORD dwInetError;
DWORD dwExtLength = 1000;
TCHAR *szExtErrMsg = NULL;
TCHAR errmsg[1000];
szExtErrMsg = errmsg;
int returned = InternetGetLastResponseInfo( &dwInetError, szExtErrMsg, &dwExtLength );
debug("dwInetError: %d Returned: %d\n", dwInetError, returned);
debug("Buffer: %s\n", szExtErrMsg);
debug("%s() : ERROR to get '%s' file (errorCode=%d)\n", __FUNCTION__, strSource.c_str(), GetLastError());
return false;
}