Can anyone help me figure out how to retrieve the size (in pixels, bytes) of a picture in a Windows 8 app? I'm using openPicker to select the file but can't seem to find the size attributes. I want to display an error message if the file is too large. Any suggestions on how to obtain this information would be greatly appreciated. Thanks!
To access necessary information from the StorageFile object, there's no need to open or load the file into memory.
Let's assume myFile represents the StorageFile being used.
To obtain image dimensions, utilize myFile.properties.getImagePropertiesAsync. This will return an ImageProperties object containing width and height properties. An example of how to retrieve ImageProperties can be found in the Simple imaging sample, scenario 1.
For file size, use myFile.getBasicPropertiesAsync. This function will provide a BasicProperties object with the corresponding size property value.
After spending several hours searching and experimenting, I finally found a solution that worked for me:
//insert image
document.getElementById("btnAddImg").addEventListener('click', function () {
// Create the picker object and specify options
var openPicker = new Windows.Storage.Pickers.FileOpenPicker();
openPicker.viewMode = Windows.Storage.Pickers.PickerViewMode.thumbnail;
openPicker.suggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.picturesLibrary;
openPicker.fileTypeFilter.replaceAll([".png", ".jpg", ".jpeg"]);
openPicker.pickSingleFileAsync().then(function (file) {
file.openAsync(Windows.Storage.FileAccessMode.read).done(function (stream) {
var fileType = file.contentType;
var blob = MSApp.createBlobFromRandomAccessStream(fileType, stream);
var fdata = new FormData();
fdata.append('upload_field', blob);
//additional code....
});
});
});
I hope this solution can assist others facing similar challenges.
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