CODEWITHSUNDEEP
c++visual-studiodebuggingbreakpoints
Adrian
Adrian

Reputation: 20058

How to put a conditional breakpoint to test if a CString variable is empty

So I have this simple code snippet:

CString str;
..................
if ( str.IsEmpty() )
   str = spRelease->GetID();

I want to put a conditional breakpoint on the last line to test if str is empty. I tried this first:

str == ""

But I get this:

Error overloaded operator not found

Then this:

str.isEmpty() == 0

And get this:

Symbol isEMpty() not found

Any idee how this could be done ? Any workaround ?

Thanks.

Upvotes: 1

Views: 2965

Answers (3)

IronMensan
IronMensan

Reputation: 6821

One pattern that I've seen for things like this is to add a bit of code like this:

if (some_condition) {
   int breakpoint=rand();
}

This generates a warning about breakpoint being initialized but not used so it is easy to remember to take it back out. This also allows you test any condition you want, including invoking functions or anything else, without having to worry about restructions of the debugger. This also avoids the limit on the number of conditional breakpoints you can have that some debuggers have.

The obvious downsides are that you can't add one during a debug session, recompiling, remembering to take them out, etc.

Upvotes: 0

duedl0r
duedl0r

Reputation: 9414

Why don't you just put a normal breakpoint on the last line? You already know str is empty. If you want to double check whether your string is empty, I would use an ASSERT instead.

If you really have to check your string, you have to check m_pszData in your CString, so your condition looks like this:

str.m_pszData[0] == '\0'

Upvotes: 5

Pedro Ferreira
Pedro Ferreira

Reputation: 860

In Visual Studio 6 you have the operation IsEmpty(), note that the first 'I' is uppercase. You also have the Compare() operation. Which version of VS are you using?

Upvotes: 1

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