how to debug my dll plugin with delphi 7? i have the soure code .

What exactly do you want to do? Run the plugin from the IDE, put a breakpoint somewhere you find fit, debug.
 
To debug a Plug-In DLL in Delphi 7, go to the Run > Parameters menu item in the IDE, and select the PL/SQL Developer executable as the host application. When you now run your project, PL/SQL Developer will be launched allowing you to set breakpoints and step through your DLL code.

Note that it may be useful to set the PL/SQL Developer Plug-In directory to your Delphi project directory.
 
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