You’ve already encountered the error code 0x000006CF (RPC_S_STRING_TOO_LONG) before, and I provided a solution back then. Here’s the information again in case it helps you refresh your memory:

Fixing Win32 Error 0x000006CF (RPC_S_STRING_TOO_LONG)

The error code 0x000006CF translates to RPC_S_STRING_TOO_LONG. This error message indicates that the RPC call failed because a string passed in the arguments was too long for the server to handle.

Understanding String Length Limits in RPC:

• In RPC communication, data is exchanged between client and server. This data can include strings of text.
• Servers have limitations on the maximum length of strings they can handle within an RPC call.
• The RPC_S_STRING_TOO_LONG error occurs when the client attempts to send a string that exceeds the server’s supported maximum length.

Reasons Behind RPC_S_STRING_TOO_LONG:

There are a couple of reasons why you might encounter this error:

• Large Data Transfer: The client code might be inadvertently trying to send a string that is larger than the server’s limit.
• Unintended String Concatenation: In some cases, code that builds strings dynamically might end up creating a longer string than expected due to unintended concatenation.

Resolving RPC_S_STRING_TOO_LONG:

1. Review Client-Side Code:

   • Examine the parts of your client code responsible for marshalling data and building the string arguments for the RPC call. Identify where the long string is being constructed.

2. Verify String Length:

   • Before making the RPC call, implement checks to ensure the string being sent is within the server’s supported maximum length. You can consult program documentation or server administrator for this information.

3. Truncate or Break Down Long Strings:

   • If necessary, modify the client code to truncate the string to the allowed maximum length or break down the long string into smaller chunks and send them in separate RPC calls.

4. RPC Development Tools (if applicable):

   • Some RPC development libraries or tools might offer functionalities to validate data lengths before marshalling them for RPC calls.

Additional Tips:

• Consider using string manipulation functions in your client code to limit the length of strings being prepared for RPC calls.
• Debuggers or logging mechanisms can help capture details about the string being sent in the RPC call and identify if it’s exceeding the allowed length.

By understanding the limitations on string lengths in RPC and the reasons behind the RPC_S_STRING_TOO_LONG error, you can identify the culprit behind the long string. Reviewing client-side code, verifying string length, truncating or breaking down long strings, using RPC development tools (if applicable), and utilizing string manipulation functions can help address this error.