CODEWITHSUNDEEP
iosxcodeswiftui-testingxcode-ui-testing
Tomasz Bąk
Tomasz Bąk

Reputation: 6204

Limit on launch arguments characters for iOS application

I'm trying to pass images to UI Tests. To do this I use launch arguments.

let bundle = NSBundle (forClass: self.dynamicType)
let images = ["img1", "img2"]
    .map {
        bundle.URLForResource($0, withExtension: "jpg")!
    }
    .map {
        NSData(contentsOfURL: $0)!
    }
    .map {
        $0.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: .allZeros))
    }

XCUIApplication().launchArguments= ["IMAGES", images.joinWithSeparator("_")]

I unpack them the same way. A one or two small images work as expected, but if I use large pictures I get:

The operation couldn’t be completed. (FBSOpenApplicationErrorDomain error 1.)

Is there some arbitrary number of characters I can pass as the launch arguments?

Upvotes: 2

Views: 769

Answers (1)

Nikolai Ruhe
Nikolai Ruhe

Reputation: 81868

The terminal can tell you the maximum length of the command line:

$ sysctl kern.argmax
kern.argmax: 262144

This value includes space needed for the environment. It's probably a bad idea to pass blobs directly in the arguments.

You should pass the URLs and read the contents of the files in the process.

Upvotes: 3

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