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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