Capture and save screenshot with ScreenCapture.CaptureScreenshot

Question

I\'ve been trying to take a screenshot and then immediately after, use it to show some sort of preview and some times it works and some times it doesn\'t, I\'m currently not

Answer 1

The ScreenCapture.CaptureScreenshot function is known to have many problems. Here is another one of it.

Here is a quote from its doc:

On Android this function returns immediately. The resulting screenshot is available later.

The iOS behavior is not documented but we can just assume that the behavior is the-same on iOS. Wait for few frames after taking the screenshot before you attempt to read/load it.

public IEnumerator TakeScreenshot()
{

    string imageName = "screenshot.png";

    // Take the screenshot
    ScreenCapture.CaptureScreenshot(imageName);

    //Wait for 4 frames
    for (int i = 0; i < 5; i++)
    {
        yield return null;
    }

    // Read the data from the file
    byte[] data = File.ReadAllBytes(Application.persistentDataPath + "/" + imageName);

    // Create the texture
    Texture2D screenshotTexture = new Texture2D(Screen.width, Screen.height);

    // Load the image
    screenshotTexture.LoadImage(data);

    // Create a sprite
    Sprite screenshotSprite = Sprite.Create(screenshotTexture, new Rect(0, 0, Screen.width, Screen.height), new Vector2(0.5f, 0.5f));

    // Set the sprite to the screenshotPreview
    screenshotPreview.GetComponent().sprite = screenshotSprite;

}

Note that you must use StartCoroutine(TakeScreenshot()); to call this function.

---

If that did not work, don't use this function at-all. Here is another way to take and save screenshot in Unity:

IEnumerator captureScreenshot()
{
    yield return new WaitForEndOfFrame();

    string path = Application.persistentDataPath + "Screenshots/"
            + "_" + screenshotCount + "_" + Screen.width + "X" + Screen.height + "" + ".png";

    Texture2D screenImage = new Texture2D(Screen.width, Screen.height);
    //Get Image from screen
    screenImage.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
    screenImage.Apply();
    //Convert to png
    byte[] imageBytes = screenImage.EncodeToPNG();

    //Save image to file
    System.IO.File.WriteAllBytes(path, imageBytes);
}