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Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
API
The Informix® GLS API Programmer's Guide describes the global language support (GLS) application programming interface (API) available in Informix ESQL/C and HCL Informix DataBlade® modules.
Character processing
These topics describe the character-processing capabilities of the library.
String operations
The library supports string traversal and string processing operations on multibyte-character and wide-character strings.
String processing
The library provides functions for concatenation, string copying, string-length determination, and character searching. The library provides both multibyte and wide-character functions for these string-processing tasks.
String-length determination

Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
- Change Data Capture API Programmer's Guide
  The Informix® Change Data Capture API Programmer's Guide describes how to program applications to process changed data from HCL Informix databases using the Informix Change Data Capture API.
- Embedded SQLJ for HCL Informix®
  The Informix® Embedded SQLJ User's Guide contains information about using Informix Embedded SQLJ.
- ESQL/C Guide
  The Informix® ESQL/C Programmer's Manual explains how to use Informix ESQL/C, the Informix implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
- GLS User's Guide
  The Informix® GLS User's Guide describes the Global Language Support (GLS) feature available in Informix products.
- API
  The Informix® GLS API Programmer's Guide describes the global language support (GLS) application programming interface (API) available in Informix ESQL/C and HCL Informix DataBlade® modules.
  - Using Informix® GLS
    The library enables a program to access the culture-specific information in the GLS locales that Informix® provides.
  - Character processing
    These topics describe the character-processing capabilities of the library.
    - Types of characters
      A GLS locale supports a particular code set, which maps characters to unique bit patterns called code points.
    - Character operations
      The library supports character classification, case conversion, and code-set conversion operations on multibyte and wide characters.
    - String operations
      The library supports string traversal and string processing operations on multibyte-character and wide-character strings.
      - String traversal
        Because a single-byte character occupies only one byte, string traversal of a single-byte character string can use the built-in scaling of the C compiler. However, you must take special steps to handle string traversal of multibyte-character and wide-character strings.
      - String processing
        The library provides functions for concatenation, string copying, string-length determination, and character searching. The library provides both multibyte and wide-character functions for these string-processing tasks.
        Concatenation
        Concatenation is the process of appending one string to the end of another string.
        String copying
        String-length determination
        Character searching
      - Character/string comparison and sorting
        Collation involves the sorting of character data that is either stored in a database or manipulated in a client application.
    - Other operations
      In addition to the operations on characters and strings, the library provides support for terminating characters and strings, allocating memory for characters and strings, and truncating and fragmenting strings.
  - Data formatting
    You must handle the format of locale-specific data in your applications.
  - Informix® GLS functions
    These topics describe the functions that the library provides. First is a summary of functions by categories. The rest of the topics provide reference information about the public functions, in alphabetical order.
  - Appendix
- Informix® Object Interface for C++ Guide
  The Informix® Object Interface for C++ Programmer's Guide describes how to develop HCL Informix client applications by using the object-oriented C++ programming language.
- Informix® ODBC Driver Guide
  The Informix® ODBC Driver Programmer's Manual serves as a user guide and reference for Informix ODBC Driver, which is the Informix implementation of the Microsoft™ Open Database Connectivity (ODBC) interface, Version 3.0.
- .NET provider options
  The Data Server Provider for .NET DB2® provider option is the preferred Informix® provider for developing new applications.
- Informix® JDBC Driver Guide
  The Informix® JDBC Driver Programmer's Guide describes how to install, load, and use Informix JDBC Driver to connect to the Informix database from within a Java™ application or applet.
- Informix International Language Supplement (ILS) User Guide
  These topics include information about the translated user interface files for Informix® UNIX™ products, locales, and code set conversion tables
- Informix® OLE DB Provider Guide
  The Informix® OLE DB Provider Programmer's Guide describes the software requirements for using Informix OLE DB Provider, show how to install and configure the provider for your use, and explain how to use Informix OLE DB Provider to enable client applications, such as ActiveX Data Object (ADO) applications and web pages, to access data on the Informix server.

String-length determination

The following table lists the multibyte functions and their wide-character equivalents that determine string length or number of characters.


String-length task	Multibyte-character function	Wide-character function
Determine the number of characters in the string, not including any terminating null characters.	ifx_gl_mbslen()	ifx_gl_wcslen()
Determine the number of bytes in a multibyte string, not including any trailing space characters.	ifx_gl_mbsntsbytes()	None
Determine the number of characters in a string, not including the trailing space characters.	ifx_gl_mbsntslen()	ifx_gl_wcsntslen()
Determine the number of characters in the initial substring of one string that consists entirely of characters in a second specified character string.	ifx_gl_mbsspn()	ifx_gl_wcsspn()
Determine the number of characters in the initial substring of one string that consists entirely of characters not in a specified second character string.	ifx_gl_mbscspn()	ifx_gl_wcscspn()