ANSI Standard PL/B Language and Visual PL/B
PL/B Windows API calls
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High level languages such as PL/B provide the majority of functions that a programmer might need. But they don't do everything that is possible in a particular environment such as Windows.
The Windows API (Application Program Interface) call allows a programmer access to all the features and routines within Windows itself.
Finding documentation to the Windows API can be a challenge. Most of the resources are aimed at the Visual BASIC or the "C" programmer. The PL/B API calls are very similar to those languages, but they are not exactly the same. You'll have to do some translation which means understanding the other languages. Visual BASIC resources seem to be the easiest to work with.
There are a number of web sites that contain good API information.
Sunbelt has documented several of the most useful API calls and included the information in the code unit "PROFILE.INC" which is found in the "DEMO" folder that is created when you install the PLBWIN system.
Before using an API you must define the thing with PL/B's PROFILE
This is the same as "declaring" the API in VB. For example:
Declare Function FindFirstFile Lib "kernel32.dll" _
Alias "FindFirstFileA" _
(ByVal lpFileName As String, _
lpFindFileData As WIN32_FIND_DATA) As Long
FindFirst PROFILE kernel32: ;DLL name
FindFirstFileA: ;API name
INT4: ;File Handle return value
DIM: ;Search File Name
DIM ;FileData structure
To actually USE the PL/B profile you'd code:
WINAPI FindFirst GIVING FHANDLE USING NAME,FileData
Visual BASIC Notes
Data can be typed by designating as long
or something like as string
. The types of interest are
MORE TO COME
- integer which is a 2 byte integer number
- long which is a 4 byte integer number
- string which is just string data