Core Function DLLStructGetData
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Success: Data in the element of the struct. -- NOTE - The return value is exactly what you asked for ie your SV will become an Int32 etc. | Success: Data in the element of the struct. -- NOTE - The return value is exactly what you asked for ie your SV will become an Int32 etc. | ||
| − | Failure: | + | Failure: null. |
=== Remarks === | === Remarks === | ||
Revision as of 00:30, 26 August 2013
DLLStructGetData( <dllstruct>, <element>, <index> )
Contents |
Description
Returns the data of an element of the struct
Parameters
dllstruct
The struct returned by DLLStructCreate.
element
Which element of the struct you want to access by its element name as defined in DllStructCreate.
index
Optional; If the element is an array, you need to specify which index to return, otherwise it returns index 0. The first element is 0.
Return Value
Success: Data in the element of the struct. -- NOTE - The return value is exactly what you asked for ie your SV will become an Int32 etc.
Failure: null.
Remarks
Used in DLLCall.
When the element is char[n] and index is omitted the data returned is a String, otherwise it returns a number.
When the element is byte[n] OR ubyte[n] and index is omitted the data is returned as a Binary Variable example :
// Create a struct with a byte array of 20 in size $Struct = DLLStructCreate("ubyte a[20]; ubyte b[5]"); DLLStructSetData($Struct, "a", 12, 0); DLLStructSetData($Struct, "a", 22, 1); DLLStructSetData($Struct, "a", 44, 2); DLLStructSetData($Struct, "b", 44, 0); DLLStructSetData($Struct, "b", 66, 1); DLLStructSetData($Struct, "b", 88, 2); // Get the whole byte array and store it as Binary data $BinaryA = DLLStructGetData($Struct, "a"); println("\nData in A"); Foreach ($BinaryA as $i) { println( "Byte: " . $i . " | Hex: " . Hex($i) ); } $BinaryB = DLLStructGetData($Struct, "b"); println("\nData in B"); Foreach ($BinaryB as $i) { println( "Byte: " . $i . " | Hex: " . Hex($i) ); }
Example
/*========================================================= Create the struct struct { int var1; unsigned char var2; unsigned int var3; char var4[128]; } =========================================================*/ $str = "int var1;ubyte var2;uint var3;char var4[128]"; $a = DllStructCreate($str); if ( !$a ) { MsgBox("Error in DllStructCreate"); exit(); } /*========================================================= Set data in the struct struct.var1 = -1; struct.var2 = 255; struct.var3 = 777; strcpy(struct.var4,"Hello"); struct.var4[0] = 'h'; =========================================================*/ DllStructSetData($a,"var1",-1); DllStructSetData($a,"var2",255); DllStructSetData($a,"var3",777); DllStructSetData($a,"var4","Hello"); DllStructSetData($a,"var4","G",0); /*========================================================= Display info in the struct ;=========================================================*/ MsgBox("Struct Size: " . DllStructGetSize($a) . @CRLF . "Struct pointer: " . DllStructGetPtr($a) . @CRLF . "Data:" . @CRLF . DllStructGetData($a,"var1") . @CRLF . DllStructGetData($a,"var2") . @CRLF . DllStructGetData($a,"var3") . @CRLF . DllStructGetData($a,"var4"), "DllStruct");
