how to change the window style of a form outside your app?hard question?
i am actually trying to move a form witch is topmost and has no border.
i have the handle(hWnd) of the window.
i can write thousands of lines of code if guaranteed to work.
how to change the window style of a form outside your app?
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Assuming that this window could be from any app produced from any kind of Win32-based runtime, it looks like you'll have to resort to p/invoke of the core Win32 apis for window operations.
For example, you could use SetWindowPos, which can be imported from user32.dll. It's signature is this:
I'm not going to assume that you've done a p/invoke import before, so let's go from the top. Let's just bash out a windows forms app:
1) Create a windows forms app and then add these declarations to the Form1 class:
The annoying thing with p/invoke of Win32 windows methods is that you then have to start importing various numeric constants etc that Win32 uses - hence all the gumph beforehand.
Refer to the MSDN link for the SetWindowPos method for an explanation of what they do.
2) Add a button to the form called cmdMakeHidden and then write the handler as follows:
Replace the 'this.Handle' with the window handle of your choice to hide that window.
This method is actually used to apply multiple changes at once, hence the need to use some of the
SWP_NO*
options. For example, you should specify SWP_NOSIZE otherwise passing 0 for cx and cy will cause the window to shrink to zero width and height at the same time.To demonstrate moving a window, add another button your form called cmdMove and then write the click handler as follows:
This code moves your form to 100,100 whenever you hit the button.
Again, replace the this.Handle as you see fit. HWND_TOP here is completely optional, since reordering has been disabled with the SWP_NOZORDER and SWP_NOREPOSITION flags.
Hope this helps get you on the right track!