Using GetLastError() in a loop or within an event handler.Not storing the previous error code in a variable before overwriting it with a new value.Trying to retrieve the previous error code after the current one has been overwritten.

How do I fix: Method 2: Use a Stack-Based Approach?

Step 1: Create an array or stack to store the error codes.Step 2: Push the current error code onto the stack, and then pop the previous error code off the stack.Step 3: Use the popped error code instead of GetLastError().

Software⏱️ 3 min read📅 2026-05-29

How to Fix: Is there a way to retrieve the last error code of an application?

Q: Step-by-Step Verified FixesMethod 1: Save and Retrieve the Previous Error Code?

Step 1: Declare a variable to store the previous error code, for example int prevError = 0;.Step 2: Assign the current error code to both sc and prevError, like this: sc = GetLastError(); prevError = sc;.Step 3: Use prevError instead of GetLastError() to retrieve the previous error code.

Retrieve last error code in C++ application without modifying the app.

Quick Answer: Use the Windows API function GetLastErrorEx to retrieve the previous error level.

📋 Table of Contents

⚠️ Common Causes
🛠️ Step-by-Step Verified Fixes
💡 Conclusion

The error you're encountering is due to the fact that GetLastError() returns a local variable, which gets overwritten on each call. This means that once you've assigned a value to sc, it's no longer available for subsequent calls to GetLastError(). As a result, the previous error code is lost and can't be retrieved.

⚠️ Common Causes

Using GetLastError() in a loop or within an event handler.
Not storing the previous error code in a variable before overwriting it with a new value.
Trying to retrieve the previous error code after the current one has been overwritten.

🛠️ Step-by-Step Verified Fixes

Method 1: Save and Retrieve the Previous Error Code

Step 1: Declare a variable to store the previous error code, for example int prevError = 0;.
Step 2: Assign the current error code to both sc and prevError, like this: sc = GetLastError(); prevError = sc;.
Step 3: Use prevError instead of GetLastError() to retrieve the previous error code.

Method 2: Use a Stack-Based Approach

Step 1: Create an array or stack to store the error codes.
Step 2: Push the current error code onto the stack, and then pop the previous error code off the stack.
Step 3: Use the popped error code instead of GetLastError().

💡 Conclusion

By using one of these methods, you should be able to retrieve the previous error code and diagnose issues more effectively.

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