error #2048: Undeclared identifier 'true' (line 29 of my code, the first return)

[EdPellesC99]

  
  Hi,

  I am trying to learn about the named pipe funtion. I found this code, I want to prove I can compile it. I am not able to compile with Pelles C.
I can however compile this .c program with CodeBlocks and the MinGW compiler, without error.

 I am sure I am doing something wrong, and would appreciate any tips.

 Here is the code:

    #include <windows.h>
    #include <stdio.h>
    #define BUFSIZE 1024
    #define PIPE_TIMEOUT 5000

    int main()
    {

         BOOL fConnected;
         LPTSTR lpszPipename = "\\\\.\\pipe\\SamplePipe";
         CHAR chRequest[BUFSIZE];
         DWORD cbBytesRead;
         BOOL fSuccess;
         HANDLE hPipe;

         hPipe=CreateNamedPipe(lpszPipename,
                                                 PIPE_ACCESS_DUPLEX, // read/write access
                                                 PIPE_TYPE_MESSAGE | // message type pipe
                                                 PIPE_READMODE_MESSAGE | // message-read mode
                                                 PIPE_WAIT, // blocking mode
                                                 PIPE_UNLIMITED_INSTANCES, // max. instances
                                                 BUFSIZE, // output buffer size
                                                 BUFSIZE, // input buffer size
                                                 PIPE_TIMEOUT, // client time-out
                                                 NULL); // no security attribute

        if (hPipe ==INVALID_HANDLE_VALUE)
        {
            return true;
     }


         for (;;)
         {
              // Trying connectnamedpipe in sample for CreateNamedPipe
              // Wait for the client to connect; if it succeeds,
             // the function returns a nonzero value. If the function returns
             // zero, GetLastError returns ERROR_PIPE_CONNECTED.

             fConnected = ConnectNamedPipe(hPipe, NULL) ?
                  TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);

             if (fConnected)
             {
                 fSuccess = ReadFile (hPipe, // handle to pipe
                                                 chRequest, // buffer to receive data
                                                 BUFSIZE, // size of buffer
                                                 &cbBytesRead, // number of bytes read
                                                 NULL); // not overlapped I/O

                 chRequest[cbBytesRead] = '\0';
                 printf("Data Received: %s\n",chRequest);

                  if (! fSuccess || cbBytesRead == 0)
                     break;

                  FlushFileBuffers(hPipe);
                  DisconnectNamedPipe(hPipe);
             }
             else
                // The client could not connect in the CreateNamedPipe sample, so close the pipe.
                CloseHandle(hPipe);
        }
        CloseHandle(hPipe);
        return 1;
}

 
//=======================================================


  Thank you very much.  Ed

[iZzz32]

If you really want to return true instead of 0 in int main, just #include <stdbool.h>.

[EdPellesC99]

  Thanks for the reply, I tried it. The error changed to: POLINK: error: Unresolved external symbol '_WinMain@16'.

   .... Ed

[TimoVJL]

Change projects linker option Subsystem type to Console from menu Projects -> Projects options.. -> Linker -> Type.

[EdPellesC99]

 

  Great, Worked like a champ.
Thanks so much,
I just started using Pelles C last week, and had not even found Projects / Project Options as the place for Compiler and Linker Settings (not that I would have discovered your solution on my own). I even found where I can indicate a smaller size file in the Compiler Settings (which I needed!).

Again, Timo thanks for the super help.

........ Ed  (I like the cat pic, I have a cat just like her/him  "Boots" ! )