Twips, pixels, and conversion between them

I use the following code to move the mouse at one selected spot (20000, 20000) on the screen.

Code:

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mouse_event MOUSEEVENTF_MOVE Or MOUSEEVENTF_ABSOLUTE, 20000, 20000, 0, 0

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If I click the mouse at THAT spot, the Form_MouseDown returns the following coords: x=351, y=237 (There are in PIXELS, I believe). (see EDIT)

I want to know how I can convert 351,237 back to 20000, 20000.. I don't think that mouse_event coords (20000,20000) are in twips (351 * 15 != 20000, but 5265).

I'm sure that's a quite easy one.. Thanks for helping me out.

Edit: I started using the GetCursorPos API to get the X,Y coords in pixels - x=351,y=263 would be more like it. Extra pixels in the Y coord because the form_mousedown would calculate only the visible form, EXCLUDING the title bar. In my case, I need the title bar included... MOUSEEVENTF_MOVE with coords 1000 and 1000 will bring the mouse over the title bar, and that's something I may need to do.

TWIPS are 1440 to an inch.

Screen.TwipsPerPixelX and .TwipsPerPixelY will give you values for translating between pixels (which are device specific) and TWIPS - which are a static value.

Using mouse_event coords VS pixels:

5000, 5000 - 87, 65
10000,10000 - 175,131
20000,20000 - 351,263

By trial an error, I noticed that I could take the X coord in pixel (87, 175 and 351) and multiply it by 57 to have the corresponding "mouse_event X coord".

I can work with this from now on, but I just don't understand WHY "57".

Read szlammy's post. He explained it CLEARLY. 1440 twips per inch. If you change your screen resolution, that number will no longer be valid.
Twip = PixelNum& * screen.twipsperpixelx for horizontal and screen.twipsperpixely for vertical.
If you are using API, you can get the client area of your window with

Code:

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Private Declare Function GetClientRect Lib "user32" (ByVal hWnd As Long, ByRef lpRect As RECT) As Long

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where hwnd is the handle to your window
and you can convert form pixel position to screen pixel position with this:

Code:

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Public Declare Function ClientToScreen Lib "user32" (ByVal hWnd As Long, lpPoint As POINTAPI) As Long

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where as above hwnd is the handle to your form.
Both RECT and POINTAPI are structures defined in the api text browser.