C/C++ Programmer's Guide (G06.25+)

HP C/C++ Programmer’s Guide for NonStop Systems—429301-008
8-1
8
Mixed-Language Programming for
TNS/R and TNS/E Native Programs
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Introducing the CRE on page 8-2
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Using Standard Files in Mixed-language Programs on page 8-2
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Declaring External Routines on page 8-2
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Considerations When Interfacing to pTAL on page 8-6
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Using Identifiers on page 8-7
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Matching Data Types on page 8-7
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Calling C Routines From pTAL Modules on page 8-8
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C Routines That You Cannot Call Directly on page 8-9
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Calling pTAL Routines From C Modules on page 8-9
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pTAL Procedures That You Cannot Call Directly on page 8-10
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Sharing Data on page 8-12
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Sharing pTAL Data With C Using Pointers on page 8-13
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Sharing C Data With pTAL Using Pointers on page 8-14
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Sharing pTAL Data With C Using BLOCK Declarations on page 8-15
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Sharing pTAL Global Data With C/C++ Using BLOCK Declarations on
page 8-15
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Parameters and Variables on page 8-17
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STRING and char Variables on page 8-17
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Arrays on page 8-17
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Structures on page 8-18
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Multidimensional Arrays on page 8-19
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Arrays of Structures on page 8-20
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Redefinitions and Unions on page 8-20
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Pointers on page 8-20
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Enumeration Variables on page 8-21
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pTAL Routines as Parameters to C on page 8-22
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C Routines as Parameters to pTAL on page 8-23
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Differences Between Native and TNS Mixed-Language Programs on page 8-24
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Interfacing to Native COBOL on page 8-26
This section describes the Common Run-Time Environment (CRE) and the interface
declarations that are necessary to interface from native C or C++ to other programming
languages. The CRE and the interface declarations are HP features for NonStop
systems that are not available in standard ISO/ANSI C.
You can write native mixed-language programs targeted for either the Guardian or
OSS environments. Programs can contain routines written in native C, C++, pTAL, and