ASSERTE(_CrtIsValidHeapPointer(pUserData) error / RPC call

Question

Hello, I need some Help and Direction.

I am getting CrtIsValidHeapPointer when I am returning from Server function . here's my idl definition

I have an RPC implelemtation where client calls  mgg_invalid and it populates msg and returns back to client.

void mgg_invl(

[

in] CONTEXT_HANDLE hContext,

[

out,size_is(,80)] char **msg);

and my Client implemenation

*msg = (char

 

*) midl_user_allocate(80*sizeof(char))

but this always give me a run time error , that  using variable before initialize
so i added
msg = (char **)  malloc(char);

and that compiled and ran but now i am getting Heap  error

thanks

Answer 1

Hello,

I'm not very clear about your question, the code is unclear enough, could you please describe it more clear?
Normally, this means your access is out-of-bound, I suspect the calling should be:

char *msg = (char*)malloc(80 * sizeof(char));
mgg_invl(&msg);

Sincerely,
Wesley

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Answer 2

Hello,

How are you? Is your problem resolved? May I know whether the above suggestions helped you?

Thanks,
Wesley

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