I am posting the file to server and its working fine, But the my code fails when i try to post the .zip file. May be my code is wrong in the reading the zip file contents data.

ifstream::pos_type size;
char * memblock;
ifstream file ("example.zip", ios::in|ios::binary|ios::ate);
if (file.is_open())
{
 size = file.tellg();
 memblock = new char [size];
 file.seekg (0, ios::beg);
 file.read (memblock, size);
 file.close();

 postBody.AppendFormat("Content-Disposition: form-data; name=\"datafile\"; filename=\"%s\"; \r\n\n%s", zipFilePath, memblock); 
 postBody.AppendFormat("\r\n--%s--\r\n", boundary);
}