HDM_HITTEST


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HDM_HITTEST
HDM_HITTEST 
    wParam = 0; 
    lParam = (LPARAM) (LPHDHITTESTINFO) phdhti; 
Tests a point to determine which header item, if any, is at the specified point.
Returns the index of the item at the specified position, if any, or – 1 otherwise.

phdhti
Address of an HDHITTESTINFO structure that contains the position to test and receives information about the results of the test.

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