Re: V3R6 APIs Turn ILE *SRVPGMs into DLLs

[John Dorn <jdorn@xxxxxxxxxx>]

Does anyone know what system service program exports QleActBndPgm and
QleGetExp?  What ILE C headers are required?  Are these functions
available under V3R1 and/or V3R2?  Require a PTF?

Are the developers out there ready to start writing "exit functions"?

Thanks in advance,

John Dorn
I/NET, Inc.
http://www.inetmi.com/

Neil Palmer wrote:
> 
> The following is an excerpt from today's NEWSWire/400
> 
> V3R6 APIs TURN ILE *SRVPGMs INTO DLLs
> V3R6 has two new APIs that turn ordinary ILE service programs
> (*SRVPGMs) into AS/400 dynamic link libraries (DLLs). DLLs let
> you skip activating code you rarely need or delay activating code
> until later, says Scott Gerard, an AS/400 Division senior
> programmer. Rather than hard-coding *SRVPGM and procedure names
> at compile time, you can use the two new DLL APIs -- QleActBndPgm
> (Activate Bound Program) and QleGetExp (Get Export) -- to compute
> the names at runtime. Postponing these decisions from compile
> time to runtime gives your ILE programs more control and
> flexibility.
> 
> To see how powerful the DLL APIs can be, consider the following
> example: A main program starts up and displays a screen that has
> three input fields. The first two fields are the library name and
> object name of a *SRVPGM; the third field is a procedure name.
> The application dynamically activates the *SRVPGM, looks up the
> procedure by name in the *SRVPGM, and then calls it. This
> application would be impossible to write without the DLL APIs,
> Gerard notes.
> 
> The APIs let you 1) dynamically activate or load a *SRVPGM and 2)
> get pointers to procedures and data items in the activated
> *SRVPGM. Calling procedures in a DLL is the same as calling
> producedures using a procedure pointer. API QleActBndPgm
> activates the appropriate service program and all service
> programs that are bound to it. The API does this by returning a
> value called an activation mark, which is an integer that
> uniquely identifies the *SRVPGM's activation. The second DLL API,
> QleGetExp, finds an exported symbol in a *SRVPGM. The API returns
> a value that indicates whether the symbol was found, whether the
> symbol is a procedure or a variable, and a procedure pointer or
> space pointer. The two DLL APIs are fully described in OS/400
> Program and CL Command APIs (SC41-4870-00).
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