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DLL Talk / CreateDeleteString crashes dbpro

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harrie215
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Posted: 18th Apr 2008 17:22


I use VC++2008, for some reason CreateDeleteString crashes dbpro.
So far I understand that for returning a string, you return a pointer to that string.

Who has more understanding of C++ then myself. And is willing to change the above code so that CreateDeleteString is gone and changed for other code.
IanM
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Posted: 18th Apr 2008 19:20
First, move the removal of the old string to the end of the function. If you use lines such as 'a$ = CopyString(a$)', your code will have problems.

Next, check your code to ensure that the Core pointer is being correctly populated. Something like this at the start of the function will do as a quick check:


harrie215
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Posted: 18th Apr 2008 21:06
Quote: "if (!Core) MessageBox(0, "Core not set", "", MB_OK);"


This msg is always displayed. So the core is not set.
I now use testcommands2 from dbpro third party and also the msg is always displayed.

I don't know the ins and outs of c++.
Could you tell me what I should do or change.
IanM
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Posted: 18th Apr 2008 23:10
Make sure you have the ReceiveCoreDataPtr function defined with exactly the same types as it is in section 6 of the TPC document.

If that doesn't solve the problem can you post the code you have so far - debugging without seeing the code is straining my psychic powers to the limit

harrie215
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Posted: 19th Apr 2008 15:59

IanM
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Posted: 19th Apr 2008 17:09
Well, I don't know what you were doing, but I had no problems getting things to work with your code.

The complete project is attached.

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harrie215
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Posted: 19th Apr 2008 19:37
I 've got it working here to.
I really don't know what I did wrong, but I can finish my SQL Server DLL finally.
Thanks alot for the help.

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