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how to calculate postmessage's position?

xuyunhai asked:

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when i want to use postmessage API that send single click message,i want to know how to calculate the component's position?

i konw the forth parameter that is position,the formula is that x+y*65536。
But i don't know how to get x and y's value?
maybe i didn't explain very well,
i mean's how to get the mouse x and y coordinates in the client.
after got the x and y coordinates,how to calculate and set the forth parameter.
so that i can click somewhere that i need.
Tags: C++, C#, VB, API, SDK


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