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Blitz/Example02.bb

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+; ---------------------------------------------------------------------------- ;
+; Example 2 - Calling Functions (Beginner)
+; ---------------------------------------------------------------------------- ;
+; License: Creative Commons Attribution 2.0
+; Author: Michael Fabian Dirks<michael.dirks@realitybends.de>
+; Prerequisite: Example 1
+
+; Since we now know how to retrieve a function pointer, how about we call it?
+
+Include "Example_Shared.bb"
+ExampleInit()
+
+Global fpOurFunction = 0
+Function OurFunction()
+	If fpOurFunction = 0 Then
+		fpOurFunction = BlitzPointer_GetFunctionPointer()
+		Return
+	EndIf
+	
+	Text 0, 0, "Function Pointer"
+	Text 0,15, "  0x" + Replace(RSet(Hex(fpOurFunction),8)," ","0")
+End Function
+OurFunction()
+
+While Not KeyHit(1)
+	ExampleUpdate()
+	
+;   BlitzPointer offers many ways of calling our function pointer. Each one
+;    describes different return types, parameter count and parameter types. 
+;   Let's use the one that doesn't return a value for now.
+	BlitzPointer_CallFunctionV fpOurFunction
+;   Now if we run the program, instead of a fixed native call, we're calling a
+;    function pointer instead. Pretty useful in my opinion, especially for UI,
+;    networking, fake classes, etc.
+;   We'll talk about the other ways of calling a function in Example 3.
+	
+	ExampleLoop()
+Wend
+
+End
+;~IDEal Editor Parameters:
+;~C#Blitz3D