# Launch Zoom from your app

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Normally, you would embed a meeting invitation URL in your app which
when clicked by a user, launches the Zoom app and lets the user join the
meeting.

It is also possible to allow users to launch just the Zoom app from your
app by pressing a link or a button without specifying a meeting
parameter.

Here are the ways to achieve that on iOS:

## Use URL

Parse the URL `zoomus://` and check whether it is openable or not and
then launch it. In order to be able to launch the external app on iOS (
in this case, the Zoom app), you should add
`LSApplicationQueriesSchemes` scheme as a key in the `info.plist` file:

```objectivec
<key>LSApplicationQueriesSchemes</key>

<array>

<string>zoomus</string>

</array>
```

> **Note:** If the key is missing from your app's `.plist` file, the
> following error will occur: _This app is not allowed to query for
> scheme._

```objectivec
- (void)onZoomClient
{
    NSString *Uri = @"zoomus://";

    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:Uri]])
    {
        if (@available(iOS 10.0, *)) { // If the system OS is iOS 10.0 and above
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:Uri] options:@{} completionHandler:nil];
        } else {
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:Uri]];
        }
    }
}
```

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