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Editorial Team
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Asked: 2026-06-11T18:46:29+00:00

I have code designed for Win32 (XP and later) that I am porting to

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I have code designed for Win32 (XP and later) that I am porting to Windows Mobile 6. It contains this line:

int count = ::WideCharToMultiByte( CP_ACP, WC_NO_BEST_FIT_CHARS, ..., 0, 0 );

On Windows XP, this works fine, but on Windows Mobile it returns 0 and GetLastError() returns error 1004 “Invalid flags”. WC_NO_BEST_FIT_CHARS is defined in winnls.h in the Windows Mobile 6 SDK.

This code will work in my limited tests if I either replace the call with ::wcstombs or replace WC_NO_BEST_FIT_CHARS with 0.

I’d like to know what is the ramification of making either of those changes. Will this still work if I run my program on a Chinese or Russian version of Windows Mobile?

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1 Answer

  1. Editorial Team

    Windows Mobile is based on Windows CE, and acording to the documentation, WideCharToMultiByte does not support the flag WC_NO_BEST_FIT_CHARS in Windows CE.

    According to that page, supported flags are:

    WC_COMPOSITECHECK   Convert composite characters to precomposed characters.
WC_DISCARDNS        Discard nonspacing characters during conversion.
WC_SEPCHARS         Generate separate characters during conversion.
                    (This is the default conversion behavior).
WC_DEFAULTCHAR      Replace exceptions with the default character during conversion.
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