我想从图像中获取有关地理位置的信息,如下图所示
void cam_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
Image cameraImage = new Image();
BitmapImage bImage = new BitmapImage();
bImage.SetSource(e.ChosenPhoto);
cameraImage.Source = bImage;
e.ChosenPhoto.Position = 0;
ExifReader reader = new ExifReader(e.ChosenPhoto);
double gpsLat, gpsLng;
reader.GetTagValue<double>(ExifTags.GPSLatitude,
out gpsLat))
reader.GetTagValue<double>(ExifTags.GPSLongitude,
out gpsLng))
MessageBox.Show(gpsLat.ToString() + "" + gpsLng.ToString());
}
}
这样我们就可以检测出拍摄图像的位置。请帮助找到这些财产。
您将需要EXIF
从图像中读取数据。
您可以使用这样的库
// Instantiate the reader
ExifReader reader = new ExifReader(@"..path to your image\...jpg");
// Extract the tag data using the ExifTags enumeration
double gpsLat, gpsLng;
if (reader.GetTagValue<double>(ExifTags.GPSLatitude,
out gpsLat))
{
// Do whatever is required with the extracted information
//...
}
if (reader.GetTagValue<double>(ExifTags.GPSLongitude,
out gpsLng))
{
// Do whatever is required with the extracted information
//...
}
更新。代码改为使用MemoryStream
void cam_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
using (MemoryStream memo = new MemoryStream())
{
e.ChosenPhoto.CopyTo(memo);
memo.Position = 0;
using (ExifReader reader = new ExifReader(memo))
{
double[] latitudeComponents;
reader.GetTagValue(ExifTags.GPSLatitude, out latitudeComponents);
double[] longitudeComponents;
reader.GetTagValue(ExifTags.GPSLongitude, out longitudeComponents);
// Lat/long are stored as D°M'S" arrays, so you will need to reconstruct their values as below:
var latitude = latitudeComponents[0] + latitudeComponents[1] / 60 + latitudeComponents[2] / 3600;
var longitude = longitudeComponents[0] + longitudeComponents[1] / 60 + longitudeComponents[2] / 3600;
// latitude and longitude should now be set correctly...
}
}
}
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句