How to pass a byte array from VB to C++ DLL

[Saman]

Define the C++ DLL function as below.

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int __stdcall MyFunc(char *buf, long length);

Now declare the function in VB6 as below.

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Declare Function MyFunc(ByVal buf as Long, ByVal len As Long) As Long

Here is how you need to call it.

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Dim buf(1023) as Byte ' 1024 element array
MyFunc VarPtr(buf(0)), 1024