How do I hook API in Delphi

To create an API hook in Delphi, you can use the HookAPI() function from the JclHookExcept unit, which is part of the JEDI Code Library (JCL). Here is an example of how you might use this function:

uses
  JclHookExcept;

function MyHookProc(ExceptionInfo: PExceptionRecord): Boolean;
begin
  // This is where you can add your own code to handle the API call
  Result := True; // Return True to prevent the original API call from being executed
end;

begin
  // Hook the API function using the name of the DLL and the function name
  HookAPI(‘user32.dll’, ‘MessageBoxA’, @MyHookProc);
end.

uses

JclHookExcept;

function MyHookProc(ExceptionInfo: PExceptionRecord): Boolean;

begin

// This is where you can add your own code to handle the API call

Result := True; // Return True to prevent the original API call from being executed

end;

begin

// Hook the API function using the name of the DLL and the function name

HookAPI(‘user32.dll’, ‘MessageBoxA’, @MyHookProc);

end.

This will hook the MessageBoxA function in the user32.dll library, and redirect any calls to this function to the MyHookProc function. You can then add your own code to this function to handle the API call in any way you like.

How do I hook API in Delphi

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