Question

如何将图像转换为字节并发送到流，然后从输入流接收字节，并将字节再次转换为图像？

Answer 1

从图像中获取字节：

NSData *imageData = UIImageJPEGRepresentation(image, imageQuality);

从字节中获取图像：

UIImage *image = [UIImage imageWithData: imageData];

BTW，如果需要NSData中的字节，只需调用其bytes方法。

Answer 2

如何获取流字节并转换回图像，下面是我的代码：但我得到的图像是空白的。为什么呢？

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {

  switch (streamEvent) {
    case NSStreamEventOpenCompleted:
      NSLog(@"Stream opened");
      break;
    case NSStreamEventHasBytesAvailable:

      if (theStream == inputStream) {
        uint8_t buffer[5000]; 
        int len;

        while ([inputStream hasBytesAvailable]) {
          len = [inputStream read:buffer maxLength:sizeof(buffer)];
                    NSLog(@"len=%d", len);
          if (len > 0) {

            NSData *pictureData = [NSData dataWithBytes:buffer length:len];

            UIImage *images = [[UIImage alloc]initWithData:pictureData];
                        [imagesview setImage:imagess];            
          }    
        }
      }
      break;
  }        
}

Answer 3

将图像转换为如下字节：

NSData *imageData = UIImagePNGRepresentation(yourImage.image);  
NSUInteger len = [imageData length];
Byte *byteData= (Byte*)malloc(len);
[imageData  getBytes:byteData length:len];

现在像这样字节成像：

NSData *pictureData = [NSData dataWithBytes:byteData];
UIImage *image = [[UIImage alloc]initWithData:pictureData];

Answer 4

UIImage到字节数组

UIImage *image = [UIImage imageNamed:@"image.png"];
NSData *data = UIImagePNGRepresentation(image);
NSString *byteArray  = [data base64Encoding];

字节数组到UIImage

+ (UIImage *)imageWithData:(NSData *)data;
NSData *data = [NSData dataWithBytes:YOUR_BYTE_ARRAY length:ARRAY_LENGTH];
UIImage *img = [UIImage imageWithData:data];
UIImageView *imgView = [[UIImageView alloc]initWithImage:img];

希望你找到解决方案。

如何将图像转换为字节和字节到图像？

4 个答案: