My program keeps crashing

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Join Date: May 2008

Posts: 5

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Xyhm

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My program keeps crashing

May 7th, 2008

I've developed a program that communicates with another program through anonymous pipes set up by the other program (not written by me).

The problem is that my program keeps crashing as soon as I add something more than just receiving the info. For example, if I add a simple "showMessage", it crashes, but works again if I remove it.

Here is the code:

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procedure TArena.read_winboard; 
var text:string[50];
    ch:char;
begin
   while true do
   begin
      text:='';
      repeat
         read(input,ch);
         text:=text+ch;
      until ch=#10;

      //showMessage('this instruction makes the program crash');

      form1.memo1.Lines.Add(text);
 
   end;
end;

Obviously the showMessage-instruction is just an example. If I try to do any parsing of the incoming text (for example sending it to a parser-function of some sort), it crashes. But the code above, devoid of anything extra, doesn't crash, and I can tell by the ouput in the memo that everything is received as expected (and sending info the other way works as well). So the communication is working.

I hear that buffering handled wrongly can cause problems (even crashing?). Is the input used by that read function using a buffer? And is the read function I'm using a real systems call or a part of Delphi (internally doing the systems call)?

My program has no previous history of crashing.