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Client APIs and toolsYou can use the HCL Informix® implementation of client APIs to develop applications for Informix® database servers.
Informix® Object Interface for C++ GuideThe Informix® Object Interface for C++ Programmer's Guide describes how to develop HCL Informix® client applications by using the object-oriented C++ programming language.
AppendixesThis section contains additional reference information.
The ITLocale classThis section describes the ITLocale class, which encapsulates the GLS API.
Character classification methodsThis section describes the ITLocale methods for classifying characters.
The IsCntrl methodThis method determines whether multibyte character c or wide character c is a control character according to the rules of the current locale.

The IsCntrl method

This method determines whether multibyte character c or wide character c is a control character according to the rules of the current locale.

ITBool IsCntrl(const char *c, int nbytes = ITLocale::ScanNoLimit) const

ITBool IsCntrl(ITWChar c) const

The nbytes parameter specifies the length of the corresponding multibyte character c. You can provide an integer to specify the number of bytes in c, in which case this method reads up to this many bytes from c when trying to form a complete character. Or you can set nbytes to ITLocale::ScanNoLimit (the default), in which case this method reads as many bytes as necessary to form a complete character.

This method returns TRUE if c is a control character; otherwise it returns FALSE.

If there is an error, this method returns FALSE. Call ITLocale::GetError() to retrieve a specific error message.

For more information, see the ifx_gl_ismcntrl function in the Informix® GLS User's Guide.

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