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Asked: 2026-06-18T06:49:13+00:00

I have the following COM visible property in a C# class: [ComVisible] bool[] Values;

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I have the following COM visible property in a C# class:

[ComVisible]
bool[] Values;

I have an instance of the class in C++ and used the following code to set this property (only pseudocode)

CComSafeArray<VARIANT_BOOL> values(3);
values[0] = VARIANT_FALSE;
values[1] = VARIANT_FALSE;

HRESULT hr = instance->put_Values(values.Detach());

The last line of the above code returns COR_E_SAFEARRAYTYPEMISMATCH (0x80131533). I tried with BYTE and VARIANT (with BOOL), but no success.

Can anyone please help?

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1 Answer

  1. Editorial Team

    Took me a while to figure it out but I got it: pass VT_BOOL as the second template parameter to CComSafeArray:

    CComSafeArray<VARIANT_BOOL, VT_BOOL> values(3);

    Without that template parameter, the SAFEARRAY will be created with the VARTYPE VT_I2 (a 2-byte integer, because VARIANT_BOOL is an alias for short), which is not what a C# property of type bool[] expects.

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