Delphi中三种方法获取Windows任务栏的高度

第一种：需要引用Windows单元

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1. ShowMessage(IntToStr(GetSystemMetrics(SM_CYSCREEN)-GetSystemMetrics(SM_CYFULLSCREEN)-GetSystemMetrics(SM_CYCAPTION)));

第二种：需要引用Windows单元

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1. function GetSystemTaskBarHeight:Integer;
2. var
3. R:TRect;
4. begin
5. SystemParametersInfo(SPI_GETWORKAREA,0,@R,0);
6. Result:=Screen.Height-R.Bottom;
7. end;

第三种：要引用ShellAPI单元

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1. function GetTaskBarRect: Integer;
2. var
3. TBData: TAPPBARDATA;
4. begin
5. TBData.cbSize := SizeOf(TAPPBARDATA);
6. SHAppBarMessage(ABM_GETTASKBARPOS, TBData);
7. Result :=Screen.Height-TBData.rc.Top;
8. end;

http://blog.csdn.net/chaijunkun/article/details/5577285