Michael Fabian Dirks
38af4e7491
- Added and updated examples for more advanced usage. - Added Direct Memory Access (DMA) functions, use with caution. - Fixed a backwards instruction jump caused by using __cdecl instead of __stdcall. - Removed string return type as it caused an unsolvable memory leak.
42 lines
1.3 KiB
BlitzBasic
42 lines
1.3 KiB
BlitzBasic
; ---------------------------------------------------------------------------- ;
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; Example 2 - Calling Functions (Beginner)
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; ---------------------------------------------------------------------------- ;
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; License: Creative Commons Attribution 2.0
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; Author: Michael Fabian Dirks<michael.dirks@realitybends.de>
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; Prerequisite: Example 1
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; Since we now know how to retrieve a function pointer, how about we call it?
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Include "Example_Shared.bb"
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ExampleInit()
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Global fpOurFunction = 0
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Function OurFunction()
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If fpOurFunction = 0 Then
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fpOurFunction = BlitzPointer_GetFunctionPointer()
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Return
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EndIf
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Text 0, 0, "Function Pointer"
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Text 0,15, " 0x" + Replace(RSet(Hex(fpOurFunction),8)," ","0")
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End Function
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OurFunction()
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While Not KeyHit(1)
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ExampleUpdate()
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; BlitzPointer offers many ways of calling our function pointer. Each one
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; describes different return types, parameter count and parameter types.
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; Let's use the one that doesn't return a value for now.
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BlitzPointer_CallFunctionV fpOurFunction
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; Now if we run the program, instead of a fixed native call, we're calling a
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; function pointer instead. Pretty useful in my opinion, especially for UI,
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; networking, fake classes, etc.
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; We'll talk about the other ways of calling a function in Example 3.
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ExampleLoop()
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Wend
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End
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;~IDEal Editor Parameters:
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;~C#Blitz3D |