⚠️ Important note

This c-client-sdk has been superseded by the C++ Client SDK with C bindings.

Please use the examples provided with the new SDK.

LaunchDarkly Sample C Client-Side Application

We've built a simple console application that demonstrates how LaunchDarkly's SDK works.

Below, you'll find the basic build procedure, but for more comprehensive instructions, you can visit your Quickstart page or the Client-Side C/C++ SDK reference guide.

Build instructions

1. Download the latest SDK for your platform with fetch-linux.sh, fetch-mac.sh, or fetch-windows.ps1.

2. Edit hello.c and set the value of MOBILE_KEY to your LaunchDarkly mobile key. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, set FEATURE_FLAG_KEY to the flag key.

#define MOBILE_KEY "1234567890abcdef"

#define FEATURE_FLAG_KEY "my-flag"

3. On the command line, run build-linux.sh, build-mac.sh, or build-windows.ps1 to build for your platform.

4. Run ./hello

You should see the message "Feature flag '<flag key>' is <true/false> for this user".