Question

可能重复：
How Do I Get The Correct Latitude and Longitude From An Uploaded iPhone Photo?

我需要从使用iPhone相机拍摄并从相机胶卷中选择的照片访问地理编码位置（纬度和经度）信息。首先，用相机拍摄的照片......

使用相机拍摄图像后，我正在使用以下代码。然后我将图像元数据拉出并存储到NSMutableDictionary中。但是我没有在字典中看到任何GPS信息......它在哪里？我如何访问此信息。我找不到关于这方面的好文件......

以下代码：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{    
    // snip out code above to keep this question short.

    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if([mediaType isEqualToString:(__bridge NSString *)kUTTypeImage])
    {
        // images taken with camera have direct access to the metadata by using UIImagePickerControllerMediaMetadata
        NSMutableDictionary *metadata = [[NSMutableDictionary alloc] initWithDictionary:[info objectForKey:UIImagePickerControllerMediaMetadata]];
        NSLog(@"dictionary: %@", metadata);

        // rest of code snipped out to keep this question short

NSLog输出以下信息 - 但没有GPS信息

dictionary: {
DPIHeight = 72;
DPIWidth = 72;
Orientation = 6;
"{Exif}" =     {
    ApertureValue = "2.970853654340484";
    BrightnessValue = "-1.198278557694757";
    ColorSpace = 1;
    DateTimeDigitized = "2012:04:11 21:55:29";
    DateTimeOriginal = "2012:04:11 21:55:29";
    ExposureMode = 0;
    ExposureProgram = 2;
    ExposureTime = "0.06666666666666667";
    FNumber = "2.8";
    Flash = 24;
    FocalLength = "3.85";
    ISOSpeedRatings =         (
        1000
    );
    MeteringMode = 5;
    PixelXDimension = 2592;
    PixelYDimension = 1936;
    SceneType = 1;
    SensingMethod = 2;
    Sharpness = 1;
    ShutterSpeedValue = "3.911199862602335";
    SubjectArea =         (
        1295,
        967,
        699,
        696
    );
    WhiteBalance = 0;
};
"{TIFF}" =     {
    DateTime = "2012:04:11 21:55:29";
    Make = Apple;
    Model = "iPhone 4";
    Software = "5.0.1";
    XResolution = 72;
    YResolution = 72;
};

我也尝试过另一种方法，使用ALAssetLibrary但是我从不输入我的if语句，只输入else部分 - 这显然会产生与上面相同的信息。结果是，没用，因为我还没有任何GPS数据。

代码如下：

创建名为@property

的NSMutableDictionary类型photoMetadataDictionary_

然后在.m文件中执行以下操作：

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.1f) 
    {
        NSURL* assetURL = nil;
        if ((assetURL = [info objectForKey:UIImagePickerControllerReferenceURL])) 
        {
            // I never get here... Not sure why...


            ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
            [library assetForURL:assetURL resultBlock:^(ALAsset *asset)  
                {
                    NSDictionary *metadata = asset.defaultRepresentation.metadata;
                    [photoMetadataDictionary_ addEntriesFromDictionary:metadata];
                }
                    failureBlock:^(NSError *error) 
            {
            }];
        }
        else 
        {
            NSDictionary *metadata = [info objectForKey:UIImagePickerControllerMediaMetadata];
            if (metadata)
            {
                [photoMetadataDictionary_ addEntriesFromDictionary:metadata];
            }
        }
    }

从相机拍摄的照片和/或从相机胶卷中选择的照片访问地理编码（lat / lon）元数据

0 个答案: