Debugging in MFC code

Question

Debugging in MFC code

Flaviu_ 1,091

I have the following code:

CDBVariant var;
std::unique_ptr<CRecordset> recordset = ... initialized
recordset->GetFieldValue(i, var);

And I got an error:

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I want to explore what is happen in CRecordset::GetFieldValue method, using debugging step by step: F10. But I cannot reach MFC CRecordset::GetFieldValue code at all, with or without this option checked:

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The question is: how can do the debugging inside MFC code? I am using VS2022 on a MFC MDI app.

RLWA32 51,456 Reputation points

2024-10-14T09:51:07.6233333+00:00

When the assertion error dialog appears what happens when you click "Retry"?

Flaviu_ 1,091

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Program: C:\Windows\SYSTEM32\mfc140d.dll
File: D:\a\_work\1\s\src\vctools\VC7Libs\Ship\ATLMFC\Include\atlsimpstr.h
Line: 869
Expression: nLength <= GetData()->nAllocLength
For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.
(Press Retry to debug the application)
A breakpoint instruction (__debugbreak() statement or a similar call) was executed in MyApp.exe.

RLWA32 51,456 Reputation points

2024-10-14T14:13:03.8666667+00:00

Have you tried using the Call Stack to see where the problem originated?
Flaviu_ 1,091 Reputation points

2024-10-14T14:23:18.5+00:00

Of course:
RLWA32 51,456 Reputation points

2024-10-14T14:36:51.9033333+00:00

Well, did you configure symbol usage as I mentioned earlier?
Minxin Yu 13,506 Reputation points Microsoft External Staff

2024-10-15T02:40:44.5033333+00:00

Can you provide an example that reproduces the problem?
RLWA32 51,456 Reputation points

2024-10-21T06:33:50.4633333+00:00

@Flaviu_ Its been a while since we've heard from you. Anything new with this issue?
Flaviu_ 1,091 Reputation points

2024-10-21T14:56:29.25+00:00

So, the VS does not enter in MFC code, either if "Just Enable My Code" is unchecked or not. I suspect this is happen because I am working on a company laptop and I am not administrator?! I don't know for sure ...

For other issue, why I got that error at GetFieldValue method, is because the application does not select the database at the first connection, but this is follow to test though ...

Thnak you a lot!
RLWA32 51,456 Reputation points

2024-10-21T19:56:23.83+00:00

FYI, I have always been able to debug into MFC source code using symbol files when running without elevated administrator privileges.
Flaviu_ 1,091 Reputation points

2024-10-24T15:23:49.2233333+00:00

@RLWA32 Why VS 2022 still not going through VS code with or without Enable Just My code option, remain an enigma :D

And that piece of code, GetFieldValue, got that error because of ODBC driver (I connected on DB via OBDC), the ODBC driver doesn't support MultiByte Character Set, just UNICODE.

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RLWA32 51,456 Reputation points

2024-10-14T09:51:07.6233333+00:00

When the assertion error dialog appears what happens when you click "Retry"?
Flaviu_ 1,091 Reputation points

2024-10-14T14:00:55.9066667+00:00

Program: C:\Windows\SYSTEM32\mfc140d.dll File: D:\a\_work\1\s\src\vctools\VC7Libs\Ship\ATLMFC\Include\atlsimpstr.h Line: 869 Expression: nLength <= GetData()->nAllocLength For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts. (Press Retry to debug the application) A breakpoint instruction (__debugbreak() statement or a similar call) was executed in MyApp.exe.
RLWA32 51,456 Reputation points

2024-10-14T14:13:03.8666667+00:00

Have you tried using the Call Stack to see where the problem originated?
Flaviu_ 1,091 Reputation points

2024-10-14T14:23:18.5+00:00

Of course:
RLWA32 51,456 Reputation points

2024-10-14T14:36:51.9033333+00:00

Well, did you configure symbol usage as I mentioned earlier?
Minxin Yu 13,506 Reputation points Microsoft External Staff

2024-10-15T02:40:44.5033333+00:00

Can you provide an example that reproduces the problem?
RLWA32 51,456 Reputation points

2024-10-21T06:33:50.4633333+00:00

@Flaviu_ Its been a while since we've heard from you. Anything new with this issue?
Flaviu_ 1,091 Reputation points

2024-10-21T14:56:29.25+00:00

So, the VS does not enter in MFC code, either if "Just Enable My Code" is unchecked or not. I suspect this is happen because I am working on a company laptop and I am not administrator?! I don't know for sure ...

For other issue, why I got that error at GetFieldValue method, is because the application does not select the database at the first connection, but this is follow to test though ...

Thnak you a lot!
RLWA32 51,456 Reputation points

2024-10-21T19:56:23.83+00:00

FYI, I have always been able to debug into MFC source code using symbol files when running without elevated administrator privileges.
Flaviu_ 1,091 Reputation points

2024-10-24T15:23:49.2233333+00:00

@RLWA32 Why VS 2022 still not going through VS code with or without Enable Just My code option, remain an enigma :D

And that piece of code, GetFieldValue, got that error because of ODBC driver (I connected on DB via OBDC), the ODBC driver doesn't support MultiByte Character Set, just UNICODE.

Answer 1

RLWA32 51,456

In my VS2022 I can step into MFC functions without a problem. I have set the VS2022 debugging options to use the Microsoft symbol server and load symbols for all modules.

RLWA32 51,456 Reputation points

2024-10-14T14:31:56.48+00:00

@Flaviu_ I reproduced the MFC assertion on my system -

Click "Retry" takes me into the VS2022 debugger -

Now look at the call stack -

And here is the source of the problem -

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Debugging in MFC code

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