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There are other useful tidbits in this section such as creating a main menu, opening an HTML page and using the property syntax to change colors. Notably, WinDev, like Clarion, uses RGB color codes. Few other tools do.
Passing parameters
In WinDev, when you create a window there's an implicit procedure that calls that window. If you want to pass parameters to the window you need to add a statement like the following to the window's global variables code section:
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Note the syntax for Param3 - this is an optional parameter because it's assigned a default value.
Control groups
Controls can be grouped logically. Just select the controls and choose Control | Groups | Associate the selection. At that point you are supposed to be able to name the group and then change any common properties of the contained controls by changing the values on the group.
I had trouble getting this to work - I could create the group, but I'd done so and then clicked on some other control I couldn't find a way to get back to the group - clicking on the controls just selected them individually again.
Databases and analyses
Lesson 4.1 covers the different ways of accessing databases. Available data access modes include:
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OLE DB supports both the SQL* and the HRead* functions, as does ODBC via OLE DB.
The data access function library
The HRead* functions are part of a larger library of around HyperFileSQL 200 functions. This has caused me a little confusion, because although the H at the start of each function name apparently stands for HyperfileSQL most of these functions can be used with databases other than WinDev's own SQL database. So maybe it's a case of the library originally being written only for HyperFileSQL and the repurposed for databases in general.
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