C / C++ / MFC

pandit84 wrote:

Is there any API which gives me list of Seial Ports available on system.

pandit84 wrote:

QueryDosDevice () but its failed to provide any result .

#include <iostream>
#include <windows.h>

void main(){
   char port_name[16];
     for (int port_number = 1; port_number < 256; ++port_number)
     {
         port_number < 10 ?
             sprintf(port_name, "COM%d", port_number) :
             sprintf(port_name, "\\\\.\\COM%d", port_number);
         HANDLE hFile = ::CreateFile(port_name,
             GENERIC_READ | GENERIC_WRITE, 0, NULL,
             OPEN_EXISTING, 0, NULL);
         if(hFile != INVALID_HANDLE_VALUE)
             std::cout << port_name << std::endl;
         else
         {
             DWORD err = GetLastError();
             if (err == ERROR_ACCESS_DENIED ||
                 err == ERROR_SHARING_VIOLATION)
                 std::cout << port_name << std::endl;
         }
         CloseHandle(hFile);
     }

}

while(byteCount > 0){
     byteCount = server->Receive( bytes, bytes->Length, SocketFlags::None);
}

ambot->Write( bytes, 0, bytes->Length );

int SendReceiveTest2( Socket^ server )
{
     FileStream^ ambot = File::Open("pastilan.jpg", FileMode::Create, FileAccess::ReadWrite);
     array<Byte>^ msg = Encoding::ASCII->GetBytes("GET /snapshot.cgi HTTP/1.1\r\n");
     array<Byte>^ msg1 = Encoding::ASCII->GetBytes("Authorization: Basic YWRtaW46\r\n\r\n");
     array<Byte>^ header = gcnew array<Byte>(224);
     array<Byte>^ bites = gcnew array<Byte>(1);
     try
     {
         // Blocks until send returns.
     int byteCount = server->Send( msg );
      Console::WriteLine( "Sent {0} bytes.", byteCount.ToString() );
 
     int byteCount1 = server->Send( msg1 );
      Console::WriteLine( "Sent {0} bytes.", byteCount1.ToString() );
 
     byteCount = server->Receive( header, header->Length, SocketFlags::None );
      if ( byteCount > 0 )
      {
          Console::WriteLine( Encoding::UTF8->GetString( header ) );
      }
 
     int count = 0;
     while(1){
          byteCount = server->Receive( bites );
          ambot->Write(bites,0,1);
          if (byteCount ==   0)
               break;
     }
 
     if( ambot )
          delete (IDisposable^)ambot;
     }
     catch ( SocketException^ e )
     {
          Console::WriteLine( "{0} Error code: {1}.", e->Message, e->ErrorCode.ToString() );
          return ( e->ErrorCode );
     }
     return 0;
}

for(;;) {
    byteCount = server->Receive( bytes, bytes->Length, SocketFlags::None);
    if (byteCount<=0) break;
    ambot->Write( bytes, 0, byteCount );    // <<<< here we store what we've got, and nothing more.
}