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Learn how to update the window text dynamically using WinAPI by incrementing an integer variable every second and repopulating the display with the new value.
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This video is based on the question https://stackoverflow.com/q/62252685/ asked by the user 'zhaoyun' ( https://stackoverflow.com/u/12714702/ ) and on the answer https://stackoverflow.com/a/62253003/ provided by the user 'Remy Lebeau' ( https://stackoverflow.com/u/65863/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dynamically Change Window Text in WinAPI

If you're developing a Windows application using the WinAPI, you might find yourself wanting to update the text displayed in a window dynamically. A common scenario is when you want to display a variable value that changes over time, like a counter that increments every second.

In this guide, we’ll explore how to change the window text effectively to showcase an integer that increases over time, using the WM_PAINT and WM_TIMER messages.

The Challenge: Updating the Window Text

You might already have a piece of code that writes static text in a window using the WM_PAINT message, but now you need to adapt it so that the text changes based on a variable. You want to show a counter (let’s call it i) that increments every second.

Here’s the basic structure you might start with:

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Now, let’s break down how to modify this to support a dynamic counter:

The Solution: Implementing a Dynamic Counter

Step 1: Initialize the Counter Variable

First, you need to define and initialize the counter variable i globally or in a scope accessible to both the WM_TIMER and WM_PAINT cases.

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Step 2: Set up a Timer

You will need to set up a timer that sends WM_TIMER messages to your window every second. In the timer handler, increment the counter and trigger a repaint by calling InvalidateRect().

Here's how to handle it:

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Step 3: Update the Paint Handler

Now, modify the WM_PAINT case to output the current value of i. Instead of static text, you will display the integer variable.

Update your WM_PAINT handler as follows:

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Step 4: Starting the Timer

Don't forget to set the timer in your window's initialization code:

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Putting It All Together

Here’s a complete example of how your window procedure might look:

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Conclusion

By following the steps outlined in this guide, you can successfully change window text dynamically in your WinAPI applications. This will allow you to display real-time data, such as a counter that increments every second, giving your application a more interactive feel. Happy coding!