Using PAINT Tiling Starting with Null Byte Can Hang Basic (79046)

This article was previously published under Q79046

SYMPTOMS

The Basic PAINT statement may cause the computer to hang when used in conjunction with a tiling string that begins with a CHR$(0) or a null character. This can occur in any screen mode in the QB.EXE or QBX.EXE environment or in the compiled versions of the program.

STATUS

Microsoft has confirmed this to be a bug in Microsoft QuickBasic version 4.5 (buglist4.50) for MS-DOS, and in Microsoft Basic Professional Development System (PDS) versions 7.0 and 7.1 (buglist7.00, buglist7.10) for MS-DOS. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The problem occurs when the PAINT statement is used with a tiling string that begins with a CHR$(0) and a line is drawn at a specific point on the screen. The position at which the line is drawn will make a difference as to whether this problem occurs or not.

The following code fragment recreates this problem and will hang your machine:

   SCREEN 12
   LINE (2, 190)-(317, 190)
   c$ = CHR$(0)
   PAINT (100, 100), c$

Modification Type:	Minor	Last Reviewed:	1/8/2003
Keywords:	KB79046