c# - How to add GPS data to metadata on windows phone 8.1 RT -

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i making camera app in c# windows phone 8.1 rt , want add gps location metadata of taken picture.

reading location data gps not problem. reading metadata (in case) image.jpg not problem. writing/editing data is, because fields readonly.

take picture, saving:

public async void take_picture() {     imageencodingproperties format = imageencodingproperties.createjpeg();     format.width = resolutionwidth;     format.height = resolutionheight;      var imagestream = new inmemoryrandomaccessstream();     await capturemanager.capturephototostreamasync(format, imagestream);     //some more code      storagefile file = await knownfolders.pictureslibrary.createfileasync("nameofpicture.jpg", creationcollisionoption.generateuniquename);     var filestream = await file.openasync(fileaccessmode.readwrite);     await randomaccessstream.copyasync(imagestream, filestream); }

read metadata. (these properties empty, properties can read picture.)

private async void metaread_button_click(object sender, routedeventargs e) {     storagefile file1 = await knownfolders.pictureslibrary.getfileasync("nameofpicture.jpg");     var fileprops = await file1.properties.getimagepropertiesasync();     textblock1.text = "manufacturer: " + fileprops.cameramanufacturer; //writable property     textblock2.text = "model: " + fileprops.cameramodel; //writable property     textblock3.text = "title: " + fileprops.title; //writable property     textblock4.text = "latitude: " + fileprops.latitude; //readonly property     textblock5.text = "longtitude: " + fileprops.longitude; //readonly property     textblock6.text = "orientation: " + fileprops.orientation; //readonly property }

modify writable metadata:

private async void metawrite_button_click(object sender, routedeventargs e) {     storagefile file2 = await knownfolders.pictureslibrary.getfileasync("nameofpicture.jpg");     var fileprops = await file2.properties.getimagepropertiesasync();     fileprops.title = "picture me";     await fileprops.savepropertiesasync(); }

question: how can readonly properties set? "imageencodingproperties" set properties of image, not file.

finally found answer one. see rd8388's answer. need convert lat/long degree/minute/second format. not need comment out longitude denominator suggested. make sure seconds (of numerator property) divided denominator falls within expected range.

http://answers.flyppdevportal.com/categories/metro/csharpvb.aspx?id=aaf0b373-b0e0-4d91-84d8-69e768a374d8


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