How can i create a NULL-Pointer

Question

Hello,
how can i create a NULL-pointer (like in C) to call a DLL-function in Labview 8?
I have this function:
XXXXXX FuncName(int32 handle,
char * aCharName,
void * aVoidName,
int32 aInt32Name,
char * Msg);
and have to call it like this:
rc=InitCasRunF(&handle, NULL, NULL, NULL, msg);
When running the vi i get a popup with this message:
Labview: An exception occured within the external code called by a Call Library Function Node.
This might have corrupted Labview´s memory. Save any work to a new location and restart Labview.
VI "......." was stopped at Call Library Function Node Call Library FuncName 0x13E0 of subVI.
Democall.vi
The attached democall.vi is not the original but its like that.
Thanks for any help how i have to create thi NULL-pointer
Message Edited by NewOne on 01-25-2006 03:42 AM
Attachments:
democall.vi ‏8 KB

Answer 1

Thx for your help. Meanwhile it works. It was a stupid, easy thing i didnt see all the time.
I had to change the first parameter as--> Pass: "Pointer to value" instead of "Value". Thats all.
All NULL-values are passed as Int32-value.
One new problem occurs now: After runnning the function Labview crashes down.
Error-report is attached if someone can read someting in this.
When running the dll-function in a c-program it works
When calling the dll-function it in teststand it also works.
Message Edited by NewOne on 01-26-2006 05:14 AM
Attachments:
dce5_appcompat.txt ‏47 KB