Не работает POST передача файла. Непонятки с TCHAR

 
 BOOL sent= HttpSendRequest(hRequest, hdrs, wcslen(hdrs), frmdata, wcslen(frmdata)*sizeof(TCHAR));

#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[])
{
    static TCHAR frmdata[] = _T("-----------------------------7d82751e2bc0858\r\nContent-Disposition: form-data; name=\"file\"; filename=\"C:\\test.txt\"\r\nContent-Type: text/plain\r\n\r\nAAAAAAAAAAAAAAAAA\r\n-----------------------------7d82751e2bc0858--\r\n");
    static TCHAR hdrs[] = L"Content-Type: multipart/form-data; boundary=---------------------------7d82751e2bc0858"; 
 
    HINTERNET hSession = InternetOpen(L"MyAgent",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
     if(hSession==NULL)
    {
     cout<<"Error: InternetOpen";  
     system("PAUSE");
    }
 
 
    HINTERNET hConnect = InternetConnect(hSession, L"127.0.0.1",INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
     if(hConnect==NULL)
    {
     cout<<"Error: InternetConnect";  
     system("PAUSE");
    }
 
    HINTERNET hRequest = HttpOpenRequest(hConnect, L"POST",L"/upload/upload.php", NULL, NULL, NULL, 0, 1);
    if(hRequest==NULL)
    {
     cout<<"Error: HttpOpenRequest";  
     system("PAUSE");
    }
 
    BOOL sent= HttpSendRequest(hRequest, hdrs, wcslen(hdrs), frmdata, wcslen(frmdata));
    if(!sent)
    {
        
     cout<<"Error: HttpSendRequest";
     system("PAUSE");
     }
 
    //close any valid internet-handles
    InternetCloseHandle(hSession);
    InternetCloseHandle(hConnect);
    InternetCloseHandle(hRequest);
}