Using InternetConnect with IP-address fails (error 12029) - c++

Question

Here i have a snippet that doesn't work when i'am using IP address. But in MSDN it says that parameter could be dotted-decimal IP address, so it must work clearly. What is wrong? Thank you.
#include "stdafx.h"
#include <windows.h>
#include <wininet.h>
#include <tchar.h>
#include <iostream>
#pragma comment(lib,"wininet.lib")
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
char szServer[] = "127.0.0.1";
char szUrl[] = "/test/upload.php";
char Data[] = "text123";
char szHdrs[] = "Content-Type: multipart/form-data; boundary=AaB03x";
char szTead[] = "--AaB03x\r\n"
"Content-Disposition: form-data; name=\"file\"; filename=\"test.txt\"\r\n"
"Content-Type: application/octet-stream\r\n"
"\r\n";
char szTail[] = "\r\n"
"--AaB03x--\r\n";
char szUserAgent[] = "MyUA";
char *szTypes[] = {"*/*", NULL};
HINTERNET hIOpen = InternetOpenA(szUserAgent, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
if(!hIOpen)
{
printf("InternetOpenA Error\n");
}
HINTERNET hIConnect = InternetConnectA(hIOpen, szServer, INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
if(!hIConnect)
{
printf("InternetConnectA Error\n");
}
HINTERNET hHttpOpReq = HttpOpenRequestA(hIConnect, "POST", szUrl, NULL, NULL, (LPCSTR *)szTypes, 0, 1);
if(!hHttpOpReq)
{
printf("HttpOpenRequestA Error\n");
}
BOOL bHttpSendReq = HttpSendRequestA(hHttpOpReq, szHdrs, strlen(szHdrs), Data, strlen(Data));
if (!bHttpSendReq)
{ int Error = GetLastError();
printf("HttpSendRequest Error %d\n", Error);
}
system("pause");
return 0;
}
There is nothing more i can add, actually about this issue. I'am using Windows 7 x64 Ultimate and VS2008.
Now i checked this .exe on other XP and Seven machines. Looks like it works, but not on my machine. Maybe the problem is (out there) somewhere else.

Answer 1

Three hints:
Add following flags to your internetconnect:
INTERNET_FLAG_KEEP_CONNECTION | INTERNET_FLAG_PRAGMA_NOCACHE | INTERNET_FLAG_NO_CACHE_WRITE
Also add http to your reqest:
char szServer[] = "http://127.0.0.1";
You might also try with INTERNET_OPEN_TYPE_DIRECT instead of INTERNET_OPEN_TYPE_PRECONFIG
in my code base I have a work around for a 12029 error, but it happens only when connection is lost during file downloading - to fix it I must fully close all WinInet handles and retry download.