Скачать или смотреть How to Effectively Simulate Mouse Clicks in a Specific Window Using C++

Learn how to resolve mouse click and movement simulation issues in a specific window using C++. This guide covers the necessary Windows API functions and provides clear, structured guidance.
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This video is based on the question https://stackoverflow.com/q/75048743/ asked by the user 'Cartier' ( https://stackoverflow.com/u/17121547/ ) and on the answer https://stackoverflow.com/a/75050592/ 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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Simulating Mouse Clicks in a Specific Window Using C++

Are you struggling to make mouse click and movement simulations work in a specific window with C++? If you've been using the Windows API and hit a wall, you're not alone. This common issue arises when the cursor does not move to the intended position, resulting in clicks being registered in the wrong location. In this post, we'll walk through the problem and provide you with a straightforward solution to achieve the desired results in your applications.

Understanding the Problem

In your original code, you've attempted to simulate a mouse movement and click using the SendMessage() function. Below is an excerpt of your code:

[[See Video to Reveal this Text or Code Snippet]]

While this may seem logical, it’s important to understand how WM_MOUSEMOVE works. This message is sent to notify the specified window that a mouse movement has occurred, but it does not actually move the cursor on the screen. As a result, the mouse may continue to click wherever the cursor currently is, rather than the intended coordinates of (0, 0) in the specified window.

The Solution

To correctly simulate mouse clicks at a specific location in a window, you can follow these steps below, which involve some different Windows API functions that will handle the mouse movement as well as the click events effectively:

1. Move the Cursor Position

To move the cursor to the desired coordinates, you can utilize one of the following functions:

SetCursorPos(): This function sets the cursor's position to a specified point in screen coordinates.

SendInput(): This is a more advanced function that simulates mouse input in a more elaborate way, allowing for smooth and customizable control.

2. Convert Client Coordinates to Screen Coordinates

Since mouse coordinates (0, 0) are specified in the client area of your window, you need to convert these coordinates to screen coordinates using one of two functions:

ClientToScreen(): This function maps client-area coordinates to screen coordinates.

MapWindowPoints(): This can also be used to convert coordinates by taking a reference window and providing a series of points.

Example Code

Here’s how you can implement these steps in your code:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By replacing your initial usage of WM_MOUSEMOVE and incorporating the cursor movement via SetCursorPos(), alongside the necessary coordinate conversion, your mouse simulation should now effectively target the specific window. Through this approach, the mouse will accurately move to (0, 0) in the defined window and perform the click correctly.

Now that you have a clearer understanding of how to handle mouse simulations in C++, go ahead and try out the provided solution in your projects. Happy coding!