Question

我使用FastttCamera作为AVFoundation的包装器，以便在我的应用中实现相机。在我尝试使用以下代码保存捕获的图像之前，情况似乎正常：

- (void)cameraController:(FastttCamera *)cameraController didFinishScalingCapturedImage:(FastttCapturedImage *)capturedImage
{
    //Use the image's data that is received
    pngData = UIImagePNGRepresentation(capturedImage.scaledImage);

    NSLog(@"1 The size of pngData should be %lu",(unsigned long)pngData.length);

    //Save the image someplace, and add the path to this transaction's picPath attribute
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory

    int timestamp = [[NSDate date] timeIntervalSince1970];

    NSString *timeTag = [NSString stringWithFormat:@"%d",timestamp];

    filePath = [documentsPath stringByAppendingString:timeTag]; //Add the file name


    NSLog(@"The picture was saved at %@",filePath);


    [self.imageWell setImage:capturedImage.scaledImage];
}

和

...
    [pngData writeToFile:filePath atomically:YES]; //Write the file

    NSLog(@"The pngData is written to file at %@",filePath);

    NSLog(@"2 The size of this file should be %lu",(unsigned long)pngData.length);

    self.thisTransaction.picPath = filePath;
...

我稍后尝试检索图片以用于tableview单元格，但没有显示任何内容。所以我开始尝试跟踪出错的地方，显然数据实际上并没有写入文件路径指定的文件。我从战略性地NSLog s获得了以下控制台读数：

将pngData写入/ var / mobile / Containers / Data / Application / 114FC402-83E0-4D15-B1E0-68E09DAB34DC / Documents1431292149中的文件此文件的大小应为213633

并从文件路径的文件返回：

fileSizeFromFilePath的大小为0

我已经看了很多SO问题，但是还没有能够解决这个问题。有人可以告诉我哪里出错了吗？

Answer 1

pngData被写入不存在的错误路径/path/to/sandbox/Documents1431292149。

你应该替换

filePath = [documentsPath stringByAppendingString:timeTag];

带

filePath = [documentsPath stringByAppendingPathComponent:timeTag];

数据没有写入文件？

1 个答案: