hi,
I need to wirite code in delhi5 using the API of a software

but I don't know wher I have to begin...

;)

Depends, if the code comes with a PAS file with all the APIs you will need defined, use it. If it doesnt and only c code you will need to change a few variable types and depending on size of project, would say either add the function definitions on the top of your current unit, or make your own separate file (recommended thing to do ) to use.

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