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10/17/1998 at 11:36AM PDT, ID: 10089791
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7.0

Get window handle from process ID

Asked by carceri in Delphi Programming

Tags: process, handle, from, window, id

From a newsgroup I got hold on this piece of sourcecode, which is supposed to get me the window handle from a processID. Well my question is in fact quite simple. It doesn't work, but whats wrong. I know that the if statement in the callback function EnumProc() never equals true, so no handle can be returned. Unfortunatly I can't seem to udnerstand exactly what is going on. Please help

Type
  TEnumData = Record
    hW: HWND;
    pID: DWORD;
  End;

Function EnumProc( hw: HWND; Var data: TEnumData ): Bool; stdcall;
  Var
    pID: DWORD;
  Begin
    Result := True;
    If (GetWindowLong(hw, GWL_HWNDPARENT) = 0) and
       (IsWindowVisible( hw ) or IsIconic(hw)) and
       ((GetWindowLong(hw, GWL_EXSTYLE) and WS_EX_APPWINDOW) <> 0)
    Then Begin
      GetWindowThreadProcessID( hw, @pID );
      If pID = data.pID Then Begin
        data.hW := hW;
        Result := False;
      End; { If }
    End; { If }
  End; { EnumProc }

Function WindowFromProcessID( pID: DWORD ): HWND;
  Var
    data: TEnumData;
  Begin
    data.pID := pID;
    data.hW := 0;
    EnumWindows( @EnumProc, longint(@data) );
    Result := data.hW;
  End; { WindowFromProcessID }

[+][-]10/17/98 12:49 PM, ID: 1343243

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About this solution

Zone: Delphi Programming
Tags: process, handle, from, window, id
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Solution Provided By: viktornet
Participating Experts: 2
Solution Grade: A
 
 
[+][-]10/17/98 12:51 PM, ID: 1343244

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[+][-]10/18/98 09:49 AM, ID: 1343250

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