For use in Visual Studio, this has been answered here. In particular, the string provided in OBWANDO’s answer can be used to set the break point condition. Note, however, that it is a bit klugy. You will receive a warning message when the breakpoint is hit even though the debugger has stopped. It doesn’t appear … Read more
Good ol’ Daniel LeCheminant has a solid answer on what a data breakpoint does, so i’ll toss in some anecdotes that highlight useful uses: Any scenario where you know what will change, but have little or no idea where the code changing it lives (since otherwise you could simply use a conditional breakpoint). Specifically, “Impossible” … Read more
Use a conditional breakpoint that checks the first parameter. On 64-bit x86 systems the condition would be: (gdb) b write if 1==$rdi On 32-bit systems, it is more complex because the parameter is on the stack, meaning that you need to cast $esp to an int * and index the fd parameter. The stack at … Read more
⚠ Heads up, seems this is no longer available since Visual Studio 2022. In my case I was using Visual Studio 2013, NUnit 2.6.4, and attaching a debugger to a unit test session, and I was getting a similar message: The condition for a breakpoint failed to execute. The condition was ‘type.Name.Contains(“FooBar”)’. The error returned … Read more
It is certainly possible to set a condition like a variable receiving a certain value. This is known as a breakpoint condition. To create one, do the following. Set a break point at the point the variable changes Right click on the break point and select “Condition” Type in the conditional like “theNewValue == 42” … Read more
There is a much easier way in Visual Studio 2010/2012. To accomplish what you are looking for in ANSI use this: strcmp(newString._Bx._Ptr,”my value”)==0 And in unicode (if newString were unicode) use this: wcscmp(newString._Bx._Ptr, L”my value”)==0 There are more things you can do than just a compare, you can read more about it here: http://blogs.msdn.com/b/habibh/archive/2009/07/07/new-visual-studio-debugger-2010-feature-for-c-c-developers-using-string-functions-in-conditional-breakpoints.aspx
Put your breakpoint. Right-click the breakpoint image on the margin and choose Breakpoint Properties: Configure condition as you see fit:
You can use strcmp: break x:20 if strcmp(y, “hello”) == 0 20 is line number, x can be any filename and y can be any variable.
In the Visual Studio 2005 menu: Debug -> New Breakpoint -> New Data Breakpoint Enter: &myVariable