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Asked: 2026-06-04T22:51:28+00:00

I have a c++ function like, extern C __declspec ( dllexport ) DWORD GetSizeAfterMergeISOTemplates(BYTE*

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I have a c++ function like,

extern "C" __declspec ( dllexport ) DWORD GetSizeAfterMergeISOTemplates(BYTE* StoredISOTemplate, BYTE* CapturedISOTemplate)
{
}

I would like to return the size of array after merging the two byte arrays in the argument. The c++ part is working and its returning the correct value.

But my problem is I need to get the value in DWORD in c#. The function is,

   [DllImport("XFPLibISO")]
        extern static UInt32 GetSizeAfterMergeISOTemplates(Byte[] StoredISOTemplate, Byte[] CapturedISOTemplate);

But its returning the wrong value. Its 3477800 something. But actual value is around 964.

Can anybody suggest how can I do this?

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1 Answer

  1. Editorial Team

    C++ function you provided means CallingConvention.Cdecl. You must specify it, when applying DllImportAttribute:

    [DllImport("XFPLibISO", CallingConvention = CallingConvention.Cdecl)]
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