Hi all,
I am using angular file saver to download a file from the server. My Application Service creates an image on the fly and return a byte array from a memory stream. On the client side, the data is received as string. The file saver get the data with a Blob object and it save the file to disk. But, when I try to open it it is wrong.
Can you provide some code sample with the correct way to do this? Is the ApplicationService the correct place to do it? I am using mvc5/angularjs version of aspnetzero.
Thanks in advance.
Josus
4 Answer(s)
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Hi @josus,
If your project is MVC 5.x and AngularJS, you can check how we handle the profile image of the user.
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I saw it, but it is done in a MVC controller and the return type is a FileResult. I need to return the image data, something like a byte array from an ApplicationService, where no reference to System.Web.Mvc is needed. Any other option to make it work?
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I answer myself:
My ApplicationService now returns a Dto with a byte[] for the image data and other additional properties. When this Dto is serialized as Json string the byte[] is converted to a Base64 string.
In my controler I used this;
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from
to convert back this Base64 string to a javascript byte array that is the source for a Blob passed to FileSaver module. And it works!!
The final client code looks like this:
employeeService.getEmployeeCard(employee.id) .then(function (result) { var bytes = Uint8Array.from(atob(result.data.image), c => c.charCodeAt(0)); var data = new Blob([bytes], { type: 'image/jpeg' }); fileSaver.saveAs(data, result.data.employeeName + '.jpeg'); });Regards!
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@josus Thanks!
