Core Function DLLStructCreateUnion
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DLLStructCreateUnion( <def string> )
Contents |
Description
Creates a C/C++ style structure (Union) to be used with DLLCall
This is just a simple wrapper for DLLStructCreate that automatically inserts the union property into your struct by placing "union " before the def string like so DllStructCreate("union int a;float b");
Parameters
def string
See DLLStructCreate( ) for def string.
Return Value
See DLLStructCreate( ) for return value.
Remarks
See DLLStructCreate( ) for remarks.
Example
See DLLStructCreate( ) for more examples.
# A union will place all the objects at the same address $a = DLLStructCreateUnion("int a;float b"); # so when we set the floats value it also set the ints value DLLStructSetData($a,"b", 133.77); # Its size is 4 since they are both at the same offset say "Size: " . DLLStructGetSize( $a ); # Lets read the int value as a hex and it will give us the floats # value as a hex (since we wrote to the float which also set the int) $value = DllStructGetData($a,"a"); printf( "Value is %#x\n", $value ); # Prints # Size: 4 # Value is 0x4305c51f
