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Editorial Team
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Asked: 2026-06-12T08:29:30+00:00

I’m trying to compile legacy code in Qt Creator using the Microsoft Visual C++

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I’m trying to compile legacy code in Qt Creator using the Microsoft Visual C++ Compiler 10.0 (x86), and I am getting the classic error:

cannot convert parameter 1 from ‘char *’ to ‘LPCWSTR’

Rather than edit the code (something I should not be doing, it is a 3rd party SDK), the solution is to go into Visual Studio general settings and change the character set to

‘Use Multi-byte character set’

(as described here and here)

However, I’m not using the Visual Studio IDE and don’t have that setting. So I need to know what setting that actually does in terms of code/compilation. Does it set a compiler flag or #define something? How can I achieve the same in Qt Creator?

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  1. Editorial Team

    A quick check in Visual Studio and this is what I found:

    If the option is Use Unicode Character Set, you’ll have these two compiler options:

    /D "_UNICODE" /D "UNICODE"

    However, if it’s Use Multi-Byte Character Set, you’ll have:

    /D "_MBCS"

    So you either need to update the command line and change from /D "_UNICODE" /D "UNICODE" to /D "_MBCS" or #define somewhere an _MBCS symbol.

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