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I keep getting this assertion when terminating a vb app that I'm using to call a c++ dll that I made using mfc. Anyone know what I'm doing wrong?
If it's broken, I probably did it
bdiamond
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You're probably passing crud to delete or free somewhere in your DLL. Check anywhere you do malloc/new that you're eventually calling free/delete (and only once!).
You must not use malloc or new and then pass the allocated thing back to VB, since it can't deal with it correctly (and certainly won't be able to free it properly).
Steve S
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the function is declared as an int and is either returning a 1 or a 0 to vb to indicate failure or success. In VB I have it declared as a long. Could that be the problem?
If it's broken, I probably did it
bdiamond
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Unlikely. In that case the value is being passed back directly in a register.
Your function should be __stdcall, as opposed to __thiscall or __cdecl, but it almost certainly is, or you'd get a different error 
Steve S
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this is the error I'm getting in the debug info in my dll:
HEAP[Project1.exe]: Invalid Address specified to RtlFreeHeap( 1150000, 12046d0 )
If it's broken, I probably did it
bdiamond
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Pretty much as I suspected, then.
There are a few causes of this:
o This could be freeing memory twice (more common than you'd expect!)
o Using malloc/new, then altering the pointer before calling free/delete.
o Block overrun (writing past the allocated buffer)
o Accessing memory after freeing it
Also, you might want to read PSS 190799 in the MSDN KB for what you can't pass around via DLLs.
Can you do a debug build of your DLL, and run VB via the debugger or use DBMON/DebugView to see the debug output? It might provide more information...
Steve S
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Hi all,
I am using AddItem() to add tabs to a CTabCtrl but don't know how to actually add content to each tab. Can I just design dialogs or PropPages from the resources and load them into a tab?
Mark
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How do I use rand() with a button to display the random number in an edit box. I know its a simple question but I'm new to C++. please help.
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Hi,
it is very easy. Have you discovered MSDN?
Sincerely Yours,
RadioShark
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thank rdioshark I'll have a look. microsoft developers network right? will it help a newbie like me?
nicolas
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nicolas thompson wrote:
will it help a newbie like me?
A tool is what you make of it. Whether it helps you or not can only be determined by you. Others can offer their perspective but the deciding factor is solely yours. Enjoy!
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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Are you wanting help with the button-click event, or the updating of an edit box?
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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The button-click event.
Thanks very much in advance David.
nicolas
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Handle the BN_CLICKED message. If you are using MFC, use ClassWizard (Ctrl+W) to create a ON_BN_CLICKED() handler.
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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I'using Borland C++ builder 4.0. I've got a button which Ive called btnGenerate an edit box called editA. I want to generate a number in the edit box between 0-9 on the click event of the generate button. Are you familiar with the borland C++ builder. I'm not sure I've heard of the MFC.
Many thanks nicolas.
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Anonymous wrote:
Are you familiar with the borland C++ builder.
I've not used a Borland product in over a decade. Sorry.
Anonymous wrote:
I'm not sure I've heard of the MFC.
It's part of Microsoft Visual C++, the main topic of this board.
Anonymous wrote:
I want to generate a number ... between 0-9
When you are ready for it, here's the code:
int x = rand() % 10;
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I'using Borland C++ builder 4.0. I've got a button which Ive called btnGenerate an edit box called editA. I want to generate a number in the edit box between 0-9 on the click event of the generate button. Are you familiar with the borland C++ builder. I'm not sure I've heard of the MFC.
Many thanks nicolas.
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Hi all,
I have created a DLL from some C++ code (to call from my C# app).
The DLL creates and writes to a couple of files.
However, it writes them to the folder last used by the C# app.
1. Why? (Less important)
2. How do I specify where to write the file, relative to the DLL file. (More Important)
Thanks in advance for any suggestions/hints.
J
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Hi,
Do you use GetModuleFileName() or GetModuleFileNameEx()?
Sincerely Yours,
RadioShark
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No, but I am not experienced in C++.
They sound like what I need - so what's the difference.
J
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RadioShark wrote:
Do you use GetModuleFileName() or GetModuleFileNameEx()?
It appears that neither of these are recognised by the compiler - do I need to include them somehow?
---
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If you are receiving a compiler error, make sure that windows.h is included.
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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Thanks anyway - have solved it another way (in the C#).
J
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Care to share?
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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