如何将 UIImagePicker 图片转换为字节数组 objective-c

Question

我正在从图像选择器中选择 UIImage。然后我想将我选择的图像作为字节数组传递给服务器。所以在这个委托中，我得到了我选择的图像的路径。

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info

filePath=info[UIImagePickerControllerReferenceURL];

然后转换成我喜欢的字节数组

NSData *data = [NSData dataWithContentsOfURL:filePath];
NSUInteger len = [data length];
Byte *byteData = (Byte*)malloc(len);
memcpy(byteData, [data bytes], len);
NSLog(@"----BITE DATA----%@",byteData);

但是这个data总是得到零。这是为什么？请帮我。谢谢

Answer 1

请使用这个

  UIImage *Image = (UIImage*)[info valueForKey:UIImagePickerControllerOriginalImage];
        NSData *imgData = UIImageJPEGRepresentation(Image, 1); //1 it represents the quality of the image.
        NSLog(@"Size of Image(bytes):%d",[imgData length]);

Answer 2

内部方法 didFinishPickingMediaWithInfo 使用以下代码获取图像。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(chosenImage)];
    NSLog(@"image string : %@",info[UIImagePickerControllerEditedImage]);

    // save using nsuserdefaults or any other your local database
    [[NSUserDefaults standardUserDefaults] setObject:imageData forKey:@"imageData"];
}

现在使用以下代码将其显示到任何地方。

NSData *imageData = [[NSUserDefaults standardUserDefaults] valueForKey:@"imageData"];
UIImage *image = [UIImage imageWithData:imageData];
self.imageView.image = image;

Answer 3

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

  UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];


  NSData* imageData=UIImageJPEGRepresentation(image,1.0);

    // Add selected imageData in Array and pass imageData to server
     [imageDataArray addObject:imageData];


}

如何将 UIImagePicker 图片转换为字节数组 objective-c

How to convert UIImagePicker image into a byte array objective-c

bytearray

objective-c

uiimagepickercontroller

uiimage

ios