OGeek|极客世界-中国程序员成长平台

标题: iOS - 获取从照片卷轴中选择的图像的文件大小 [打印本页]

---

作者: 菜鸟教程小白    时间: 2022-12-12 13:09
标题: iOS - 获取从照片卷轴中选择的图像的文件大小

我正在构建一个应用程序，允许用户从他们的设备中选择照片和视频并将它们上传到服务器。试图获取每个项目选择的文件大小(以字节为单位)，有人可以帮我吗？

if ([dict objectForKey:UIImagePickerControllerMediaType] == ALAssetTypePhoto){ // image file
        if ([dict objectForKey:UIImagePickerControllerOriginalImage]){
            NSURL* urlPath=[dict objectForKey"UIImagePickerControllerReferenceURL"];

            item = [BundleItem itemWithPath:urlPath AndDescription:nil];
            item.itemImage = [dict objectForKeyedSubscript:UIImagePickerControllerOriginalImage];
            item.itemType = 1; // image
            item.itemSize = // what do I need here??
            [m_items addObject:item];
        }
    } else if ([dict objectForKey:UIImagePickerControllerMediaType] == ALAssetTypeVideo){ // video file
        if ([dict objectForKey:UIImagePickerControllerOriginalImage]){
            NSURL* urlPath=[dict objectForKey"UIImagePickerControllerReferenceURL"];
            item = [BundleItem itemWithPath:urlPath AndDescription:nil];
            item.itemImage = [dict objectForKeyedSubscript:UIImagePickerControllerOriginalImage];
            item.itemType = 2; // video
            item.itemSize = // what do I need here??
            [m_items addObject:item];
        }
    }

编辑

通过视频获取 NSCocaoErrorDomain 256:

            NSURL* urlPath=[dict objectForKey"UIImagePickerControllerReferenceURL"];

            item = [BundleItem itemWithPath:urlPath AndDescription:nil];
            item.itemImage = [dict objectForKeyedSubscript:UIImagePickerControllerOriginalImage];
            item.itemType = 2; // video

            //Error Container
            NSError *attributesError;
            NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:[urlPath path] error:&attributesError];
            NSNumber *fileSizeNumber = [fileAttributes objectForKey:NSFileSize];
            long fileSize = [fileSizeNumber longValue];
            item.itemSize = fileSize;

            [m_items addObject:item];

---

Best Answer-推荐答案

仅用于图像数据选择:

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

希望这会对你有所帮助。

以下方法是泛化的，它适用于图像和视频:

这样的事情应该注意查找从 UIImagePickerController

返回的所选图像或视频的文件大小

- (void)imagePickerControllerUIImagePickerController *)picker didFinishPickingMediaWithInfoNSDictionary *)info
{

        NSURL *videoUrl=(NSURL*)[info objectForKey:UIImagePickerControllerMediaURL];

        //Error Container
        NSError *attributesError;
        NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:[videoUrl path] error:&attributesError];
        NSNumber *fileSizeNumber = [fileAttributes objectForKey:NSFileSize];
        long long fileSize = [fileSizeNumber longLongValue];
}

关于iOS - 获取从照片卷轴中选择的图像的文件大小，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27244714/

---

欢迎光临 OGeek|极客世界-中国程序员成长平台 (http://ogeek.cn/)

Powered by Discuz! X3.4