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Use Windows DLL

Posted on 2001-06-17
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Last Modified: 2010-04-06
Anyone can tell me how to use MS Windows DLL (for example, i want to shutdown Windows using my Delphi program).
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Question by:vfxyb
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by:Mohammed Nasman
ID: 6199644
Hello

  Delphi made a great job, you can use most of functions of DLL (API) without declare them, they Encapsulate  most of them in delphi units, like windows, messages, and more, but u still could to declare them and use any api function
if you want to shutdown the computer u can simply call the ExitWindowsEx, it found in the windows unit, if you press ctrl and move teh mouse above the ExitWindowsEx, when u see it in blue in underline click the on it by the mouse and it will take u to the windows unit for the declartion


ExitWindowsEx( EWX_FORCE or EWX_SHUTDOWN, 0 );


if you want to see the API reference from delphi help menu, choose windows SDK

Mohammed
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Author Comment

by:vfxyb
ID: 6199651
I already read the windows sdk but i still confused is ExitWindowsEx a function in delphi's unit or in user32.dll. If i'm not wrong it's from user32.dll. so it's not a delphi unit. How can i use it?
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Accepted Solution

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Mohammed Nasman earned 150 total points
ID: 6199670
you are right, the ExitWindowsEx it's a function in user32.dll, and if you want to use an api or function you need to declare it in ur program
ExitWindowsEx need declaration to use if as the follow in
interface seciotn


function ExitWindowsEx(uFlags: UINT; dwReserved: DWORD): BOOL; stdcall;
and then in implementation section

function ExitWindowsEx; external user32 name 'ExitWindowsEx';

try to took a look at the windows unit, and you will find most of api declared in it

Mohammed
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Expert Comment

by:Aum
ID: 6201810
MS's "Win32 Programmer's Reference" help file, which comes with Delphi, explains the meaning and use of all the API calls.
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Author Comment

by:vfxyb
ID: 6204328
thank you for your comment, now i will try it at home. if you have a sample delphi program about using windows dll, please send it to vfxyb@yahoo.com
Thanks
Yopie
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