Microsoft KB Archive/122847

= FIX: Cannot Watch Local Variables of a __finally Block =

Article ID: 122847

Article Last Modified on 10/17/2003

-

APPLIES TO


 * The Integrated Debugger, when used with:
 * Microsoft Visual C++ 2.0 Professional Edition

-



This article was previously published under Q122847



SYMPTOMS
When stepping into the __finally block of a try-finally statement, any variables that might exist local to that block may not show correct values in the locals or watch window of the integrated debugger.



RESOLUTION
If you need to watch variables used in a __finally block of a try-finally statement, either declare the variables outside of the scope of the __finally block, or assign the value of the local variable to another variable of the same type that has been declared outside the scope of the __finally block.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was not reproducible in Microsoft Visual C++, 32-bit Edition, version 4.0.



MORE INFORMATION
The try-finally statement is a Microsoft extension to the C language that enables applications to guarantee execution of cleanup code when execution of a block of code is interrupted.

You can use the sample code listed below to demonstrate the problem described in this article. You will see the value of the variable 'i' is incorrect in the locals or watch window when stepping through the code of the __finally block.

Sample Code to Demonstrate Problem
/* Compile options needed: /Zi


 * 1) include 

void main( void ) {  __try {

// guarded section code... }  __finally {     int i = 2;

// termination handler code... i = 10; i = 15; i++; printf( "In __finally. i = %d.\n", i ); } }

