| CALL_EXTERNAL [message #33883] |
Tue, 04 February 2003 22:14 |
Thomas Gutzler
Messages: 44
Registered: November 2002
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Member |
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Hi again,
please correct me if I'm wrong.
CALL_EXTERNAL
- needs the /CDECL keyword to call a dll built by Borland C++ Compiler
with: extern "C" __declspec(dllexport)
It works with and without /CDECL for me
- can have values and references (default) as arguments but cannot
RETURN a pointer. Just a scalar variable with the value of an address
- cannot have a NullPointer as argument and receive a Pointer to a
variable/array (see below)
What I'm trying to do is:
C function:
int test(int argc, void* argv[])
{
if(argc != 2) return 0;
IDL_UINT *size = (IDL_UINT *) argv[0];
int *array = (int *) argv[1];
array = new int[*size];
for (int i = 0; i < *size; i++) array[i] = i;
return 1;
}
IDL:
IDL> array = PTR_NEW()
IDL> Result = CALL_EXTERNAL('mydll.dll', '_test', 10, array, /CDECL)
IDL> print, array
should be
0 1 2 3 4 5 6 7 8 9
but array is still a NullPointer
If I leave the line
array = new int[*size];
I have to initialize with array=intarr(10) and the returned array is:
0 0 1 0 2 0 3 0 4 0
This is not what I expected (funny values! maybe type-conversion helps?)
and not what I want. I want to receive a pointer to an array, because
IDL doesn't know the size of the array being returned (Yes, I could
allocate a 1000000x1 array and resize it).
Is this possible ?
Tom
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