Microsoft KB Archive/120967

= BUG: Try Blocks Within a Switch Statement Behave Incorrectly =

Article ID: 120967

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft Visual C++ 2.0 Professional Edition
 * Microsoft Visual C++ 4.0 Standard Edition
 * Microsoft Visual C++ 4.1 Subscription
 * Microsoft Visual C++ 4.2 Professional Edition
 * Microsoft Visual C++ 5.0 Standard Edition
 * Microsoft Visual C++ 6.0 Service Pack 5

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This article was previously published under Q120967



SYMPTOMS
A try block within a switch statement may cause the exception to be handled incorrectly, as illustrated by the sample code in the MORE INFORMATION section below.



CAUSE
The compiler doesn't recognize catch blocks within the switch statement. Therefore, the compiler attempts to link the try block to the next catch block outside the switch. In the sample code in the More Information section below, the second catch block is executed after the exception is thrown.



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.



Sample Code
The following sample code demonstrates the problem: /* Compile options needed: /GX


 * 1) include 

void main(void) {  int i = 0;

try {     switch ( i ) try {        case 0: throw i;     } catch( int ) {     /* Should be caught here but isn't */ printf( "Passed.\n" ); }  }   catch (...) {  /* Is caught here incorrectly */ printf( "Failed.\n" ); } }

Additional query words: kbVC400bug 9.00 10.00 10.10 10.20 exception handling

Keywords: kbbug kbnoupdate kbcpponly kbcode kbcompiler KB120967

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