我有一个来自指纹传感器设备的字节数组,我想把它转换成位图。我尝试了几个例子,但是得到的都是空的UIImage。
如果有任何方法能够完成这个操作,请告诉我。
谢谢。
这是我的函数所做的:
func didFingerGrabDataReceived(data: [UInt8]) {
if data[0] == 0 {
let width1 = Int16(data[0]) << 8
let finalWidth = Int(Int16(data[1]) | width1)
let height1 = Int16(data[2]) << 8
let finalHeight = Int(Int16(data[3]) | height1)
var finalData:[UInt8] = [UInt8]()
// i dont want the first 8 bytes, so am removing it
for i in 8 ..< data.count {
finalData.append(data[i])
}
dispatch_async(dispatch_get_main_queue()) { () -> Void in
let msgData = NSMutableData(bytes: finalData, length: finalData.count)
let ptr = UnsafeMutablePointer<UInt8>(msgData.mutableBytes)
let colorSpace = CGColorSpaceCreateDeviceGray()
if colorSpace == nil {
self.showToast("color space is nil")
return
}
let bitmapContext = CGBitmapContextCreate(ptr, finalWidth, finalHeight, 8, 4 * finalWidth, colorSpace, CGImageAlphaInfo.Only.rawValue);
if bitmapContext == nil {
self.showToast("context is nil")
return
}
let cgImage=CGBitmapContextCreateImage(bitmapContext);
if cgImage == nil {
self.showToast("image is nil")
return
}
let newimage = UIImage(CGImage: cgImage!)
self.imageViewFinger.image = newimage
}
}
我得到了一个扭曲的图像。有人能帮忙吗?