Exploring image retrieval documents in PhoneGap

In the process of developing a PhoneGap application that involves capturing images using the camera and subsequently uploading them, I have encountered an issue. In PhoneGap, there are two modes for camera operation: raw base64-encoded data or a file URI.

According to the documentation:

Note: The image quality of pictures taken with the camera on newer devices is excellent. However, encoding these images using Base64 has resulted in memory problems on certain devices such as iPhone 4 and BlackBerry Torch 9800. As a solution, it is strongly recommended to use FILE_URI as the 'Camera.destinationType'.

I am interested in utilizing the FILE_URI option. It functions effectively, allowing me to display images in IMG tags. An example of the URL structure is as follows:

file://localhost/var/mobile/Applications/4FE4642B-944C-449BB-9BD6-1E442E47C7CE/tmp/photo_047.jpg

However, at a later point in time, I need to access the contents of the file in order to upload it to a server. Initially, I attempted to achieve this using the FileReader type but encountered difficulties due to an inability to access the file via the aforementioned URL.

The error code I receive from readDataUrl is 1: FileError.NOT_FOUND_ERR = 1;

Do you have any suggestions on how I can successfully locate the file? I experimented with extracting just the last part of the path (photo_047.jpg) based on another example I came across, but unfortunately without success.

javascriptiphoneioscordova

Answer №1

Just dipping my toes into the world of PhoneGap, and while this question may have been sitting here for a while, I'll take a shot at providing an answer.

Have you considered utilizing the built-in FileTransfer object? It requires a file: URI as input.

If the FileTransfer option isn't suitable and you need to handle file data directly, you'd likely require PhoneGap's File objects such as FileReader. However, most of these objects expect a standard pathname instead of a full URI to identify the file. The NOT_FOUND_ERR you're encountering is likely due to it trying to open a file named file:/localhost/var....

Here's a simple one-liner to pull out the path portion from your URI:

var path = /file:\/\/.*?(\/.*)/.exec(fileuri)[1];

Trust this aids in your understanding!

Answer №2

Although the advice given by jgarbers was somewhat helpful, it did not completely resolve my issue. Upon further investigation, I discovered that the camera was saving photos in the Temp folder instead of the Document folder. By adjusting my local file system settings to temporary access, I was able to successfully locate the camera images.

window.requestFileSystem(LocalFileSystem.TEMPORARY, 0, ...

Answer №3

...

Using the LocalFileSystem.TEMPORARY parameter, request access to the file system

...

Extract the path from the file URI using regular expressions

Based on the solutions provided by jgarbers and Rik (successfully tested on iOS 7)

Answer №4

To easily upload files to the server, utilize the file transfer plugin.

//// Specify your file's URI in the mediaFile parameter
function sendFileToServer(mediaFile) {
    var fileTransfer = new FileTransfer();
    var filePath = mediaFile.fullPath;
    var fileName = mediaFile.name;
//// Define the URL for your service method
    var apiUrl = http://yourwebsite.com;


    fileTransfer.upload(filePath,
        apiUrl,
        function (response) {
            alert("Upload successful");


        },
        function (err) {
            alert('Error uploading file ' + filePath + ': ' + err.code);
        },
        { fileName: fileName });
}

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