- 1 year ago
How to forward/handle WM_GESTURE message to a different window
To forward or handle the WM_GESTURE message to a different window in Windows, you can use the following steps:
Get the handle of the target window:
- Obtain the handle of the window to which you want to forward or handle the WM_GESTURE message. You can use functions like
FindWindow
,FindWindowEx
, or any other method that provides the handle of the target window.
- Obtain the handle of the window to which you want to forward or handle the WM_GESTURE message. You can use functions like
Create a copy of the WM_GESTURE message:
- When you receive the WM_GESTURE message in the source window's message loop or procedure, create a copy of the message using the
CopyMessage
function. This ensures that the original message is not modified or consumed during the forwarding process.
- When you receive the WM_GESTURE message in the source window's message loop or procedure, create a copy of the message using the
Modify the copied message's hwnd field:
- Set the
hwnd
field of the copied message to the handle of the target window obtained in Step 1. This will redirect the message to the desired window.
- Set the
Forward or send the copied message:
- Use the
SendMessage
orPostMessage
function to send the copied WM_GESTURE message to the target window. Pass the modified copied message as the parameter to the function call.
- Use the
Here is an example that demonstrates the above steps:
cpp// Source window procedure receiving WM_GESTURE messages
LRESULT CALLBACK SourceWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_GESTURE:
{
// Create a copy of the WM_GESTURE message
MSG copiedMsg;
if (CopyMessage(&copiedMsg, (const MSG*)lParam))
{
// Modify the copied message's hwnd field
copiedMsg.hwnd = targetWindowHandle;
// Forward the copied message to the target window
SendMessage(copiedMsg.hwnd, copiedMsg.message, copiedMsg.wParam, copiedMsg.lParam);
}
break;
}
// Handle other messages as needed
}
// Call the default window procedure for unhandled messages
return DefWindowProc(hWnd, msg, wParam, lParam);
}
In this example, SourceWndProc
is the window procedure of the source window that receives the WM_GESTURE messages. When a WM_GESTURE message is received, the message is copied, and the hwnd
field of the copied message is modified to the handle of the target window (targetWindowHandle
). Then, the copied message is sent to the target window using SendMessage
or PostMessage
.
Please note that you need to replace targetWindowHandle
with the actual handle of the target window obtained using the appropriate method for your specific scenario.
Make sure to handle any potential error conditions, handle other necessary messages, and adjust the code based on your application's requirements.