Скачать или смотреть Resolving Shared Library Errors when Running Messenger Example in OpenDDS on Linux

Learn how to troubleshoot and fix the `error while loading shared libraries` issue when running the Messenger example in OpenDDS on Linux.
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Troubleshooting Shared Library Errors in OpenDDS Messenger Example

When working with OpenDDS, particularly the Messenger example in DCMS for OpenDDS-3.14 on Linux, you may encounter frustrating errors that halt your progress. One common issue is the “error while loading shared libraries” message, which can be tricky to resolve if you're not familiar with handling shared libraries in Linux. In this guide, we’ll explore this problem and provide a step-by-step solution to get you running the Messenger example smoothly.

The Problem

Upon attempting to execute the run_test.pl script for the Messenger example, you might see output resembling this:

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This error indicates that the required shared library file, libOpenDDS_InfoRepoServ.so.3.14.0, is missing or not accessible. Without this library, the system cannot run the program, leading to frustration for developers eager to test their applications.

The Solution

Resolving this issue is typically straightforward. Here are the steps you need to follow:

Step 1: Configure and Make

The error often stems from the way the OpenDDS environment is set up. To address this, you will need to reconfigure and compile the OpenDDS package:

Open a terminal window.

Navigate to your OpenDDS installation directory.

Run the following commands:

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Step 2: Avoid Setting a Prefix

It’s crucial that when you run the configure command, you do not set a prefix for the installation on the command line. Setting a prefix can create issues with library paths and prevent the shared libraries from being found correctly.

Step 3: Check for Library Availability

After you reconfigure and build the project, make sure the shared library file libOpenDDS_InfoRepoServ.so.3.14.0 is present in the appropriate directory (/home/user/OpenDDS-3.14/lib by default). You can check for its existence using:

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If you see the .so file listed, you’re ready to proceed to the next step.

Step 4: Run the Messenger Example

Now, you can attempt to run the Messenger example again by executing the run_test.pl script:

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You should now see the Messenger example output smoothly without any shared library errors.

Conclusion

Errors related to missing shared libraries can be daunting, especially for those new to programming in Linux. However, by following these simple steps—configuring correctly, avoiding prefixes, verifying library files, and rerunning your tests—you can resolve these issues efficiently. If you follow this guide, getting the Messenger example up and running in OpenDDS should be a breeze.

Don’t let shared library errors slow you down; tackle them with the solutions outlined above. Happy coding!