如何将UIImagePicker图像转换为字节数组objective-c

Posted 2023-02-23

【中文标题】如何将UIImagePicker图像转换为字节数组objective-c

【英文标题】：How to convert UIImagePicker image into a byte array objective-c

【发布时间】：2016-08-30 07:10:20

【问题描述】：

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];

然后转换成我喜欢这样的字节数组。

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 总是为零。这是为什么？请帮我。 谢谢

【问题讨论】：

查看我更新的代码..

【参考方案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]);

【参考方案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"];

现在使用下面的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;

【参考方案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];