func getIntProp(device C.IOHIDDeviceRef, key C.CFStringRef) int32 {
var value int32
ref := C.IOHIDDeviceGetProperty(device, key)
if ref != nil {
if C.CFGetTypeID(ref) == C.CFNumberGetTypeID() {
C.CFNumberGetValue(C.CFNumberRef(ref), C.kCFNumberSInt32Type, unsafe.Pointer(&value))
return value
}
}
return 0
}
// CFNumberToInterface converts the CFNumberRef to the most appropriate numeric
// type.
// This code is from github.com/kballard/go-osx-plist.
func CFNumberToInterface(cfNumber C.CFNumberRef) interface{} {
typ := C.CFNumberGetType(cfNumber)
switch typ {
case C.kCFNumberSInt8Type:
var sint C.SInt8
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&sint))
return int8(sint)
case C.kCFNumberSInt16Type:
var sint C.SInt16
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&sint))
return int16(sint)
case C.kCFNumberSInt32Type:
var sint C.SInt32
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&sint))
return int32(sint)
case C.kCFNumberSInt64Type:
var sint C.SInt64
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&sint))
return int64(sint)
case C.kCFNumberFloat32Type:
var float C.Float32
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&float))
return float32(float)
case C.kCFNumberFloat64Type:
var float C.Float64
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&float))
return float64(float)
case C.kCFNumberCharType:
var char C.char
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&char))
return byte(char)
case C.kCFNumberShortType:
var short C.short
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&short))
return int16(short)
case C.kCFNumberIntType:
var i C.int
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&i))
return int32(i)
case C.kCFNumberLongType:
var long C.long
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&long))
return int(long)
case C.kCFNumberLongLongType:
// This is the only type that may actually overflow us
var longlong C.longlong
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&longlong))
return int64(longlong)
case C.kCFNumberFloatType:
var float C.float
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&float))
return float32(float)
case C.kCFNumberDoubleType:
var double C.double
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&double))
return float64(double)
case C.kCFNumberCFIndexType:
// CFIndex is a long
var index C.CFIndex
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&index))
return int(index)
case C.kCFNumberNSIntegerType:
// We don't have a definition of NSInteger, but we know it's either an int or a long
var nsInt C.long
C.CFNumberGetValue(cfNumber, typ, unsafe.Pointer(&nsInt))
return int(nsInt)
}
panic("Unknown CFNumber type")
}
func convertCFNumberToFloat64(cfNumber C.CFNumberRef) float64 {
var double C.double
C.CFNumberGetValue(cfNumber, C.kCFNumberDoubleType, unsafe.Pointer(&double))
return float64(double)
}
func convertCFNumberToUInt32(cfNumber C.CFNumberRef) uint32 {
var sint C.SInt64
C.CFNumberGetValue(cfNumber, C.kCFNumberSInt64Type, unsafe.Pointer(&sint))
return uint32(sint)
}
func convertCFNumberToInt64(cfNumber C.CFNumberRef) int64 {
var sint C.SInt64
C.CFNumberGetValue(cfNumber, C.kCFNumberSInt64Type, unsafe.Pointer(&sint))
return int64(sint)
}