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Using DllCall and Pass back Address to WIL
Keywords: dllcall binary buffer
Question:
I'm experimenting with writing customized DLLs in C++ to be used in our WinBatch scripts. I've written a DLL in C++ that passes back some numeric values to the WinBatch script. A sample DllCall statement I've used is
b=0
a1=dllcall(dllname, void:"MyTest", word:b)
Message("b is ", b)
The MyTest function in the DLL returns some
calculated value. The C++ Dll looks like this:
__declspec(dllexport) void WINAPI PASCAL MyTest(int* len)
{ int i;
i = 43;
*len = i;
}
The Dll compiles and links ok but when I run the WinBatch, the value of b is displayed as 0 not the
expected 43. I have success passing back string values using char* and lpbinary but not with int* and long
(or word). Any ideas what I am missing?
If I forget the b=0 statement before the dllcall, WinBatch aborts with a "Tag Overwrite 1" error message. But I guess that is supposed to happen.
Answer:
This should work:
bb=BinaryAlloc(4)
BinaryEODSet(bb,4)
a1=dllcall(dllname, void:"MyTest", lpbinary:bb)
b=BinaryPeek4(bb,0)
BinaryFree(bb)
Message("b is ", b)
Article ID: W12870
Filename: Using Dll Created in C to Pass Address.txt
File Created: 1999:04:15:16:50:12
Last Updated: 1999:04:15:16:50:12