Q63009: "Unknown Symbol" Setting Breakpoint on Label in CodeView 3.00

Article: Q63009
Product(s): See article
Version(s): 6.00 6.00b 7.00 | 6.00 6.00b 7.00
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | SR# S900606-93 B_QuickBas S_CodeView | mspl13_basic
Last Modified: 20-JUN-1990

When debugging a BASIC program in Microsoft CodeView, a breakpoint
can be set on a BASIC label by typing the following command

   BP <label>

where <label> is any valid BASIC label. In CodeView versions 2.x, this
command works whether or not the program is started. In CodeView
version 3.00, the program must have started executing before this
command will work. If the program has not been started, CodeView 3.00
generates the error message "Unknown symbol."

This information applies to programs run under CV.EXE and CVP.EXE
versions 2.x and 3.00 when compiled with the BC.EXE compiler that
comes with QuickBASIC versions 4.00, 4.00b, and 4.50, with Microsoft
BASIC Compiler versions 6.00 and 6.00b for MS-DOS and MS OS/2, or with
Microsoft BASIC Professional Development System (PDS) version 7.00 for
MS-DOS and MS OS/2.

Breakpoints can also be set in four other ways. Each of the following
methods can be used before the program is actually started:

1. Use the following command

      bp .<line>

   where <line> is the line number that CodeView displays next to the
   label (not a BASIC line number). This works whether or not the
   program is started.

2. Use the mouse to double-click the line you want to break on.

3. Position the cursor on the line you want to break on and then
   choose Set Breakpoint from the Watch menu.

4. Position the cursor on the line you want to break on and then press
   the F9 key.

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