Function Reference

DllStructGetSize

Returns the size of the struct in bytes.

DllStructGetSize ( Struct )

 

Parameters

Struct The struct returned by DllStructCreate.

 

Return Value

Success: The size of the struct in bytes.
Failure: 0.
@Error: 0 = No Error.
1 = Struct not a correct struct returned by DllStructCreate.

 

Remarks

Used when data in the struct needs to hold the struct size.

 

Related

DllCall, DllStructCreate, DllStructSetData

 

Example


;=========================================================
;   Create the struct
;   struct {
;       int             var1;
;       unsigned char   var2;
;       unsigned int    var3;
;       char            var4[128];
;   }
;=========================================================
$str        = "int;ubyte;uint;char[128]"
$a          = DllStructCreate($str)
if @error Then
    MsgBox(0,"","Error in DllStructCreate " & @error);
    exit
endif

;=========================================================
;   Set data in the struct
;   struct.var1 = -1;
;   struct.var2 = 255;
;   struct.var3 = INT_MAX; -1 will be typecasted to (unsigned int)
;   strcpy(struct.var4,"Hello");
;   struct.var4[0]  = 'h';
;=========================================================
DllStructSetData($a,1,-1)
DllStructSetData($a,2,255)
DllStructSetData($a,3,-1)
DllStructSetData($a,4,"Hello")
DllStructSetData($a,4,Asc("h"),1)

;=========================================================
;   Display info in the struct
;=========================================================
MsgBox(0,"DllStruct","Struct Size: " & DllStructGetSize($a) & @CRLF & _
        "Struct pointer: " & DllStructGetPtr($a) & @CRLF & _
        "Data:" & @CRLF & _
        DllStructGetData($a,1) & @CRLF & _
        DllStructGetData($a,2) & @CRLF & _
        DllStructGetData($a,3) & @CRLF & _
        DllStructGetData($a,4))

;=========================================================
;   Free the memory allocated for the struct
;=========================================================
$a = 0