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- Monitoring Messages with SPY
-
-
- SUMMARY
- =======
-
- The SPY tool demonstrates how to monitor system messages sent to a specified
- window. SPY records the messages and displays them on the specified device.
- SPY is also useful in debugging, to verify that the messages you think a
- window is receiving are actually being received.
-
- SPY demonstrates the following techniques:
-
- - Using a system message hook.
- - Using the WM_COPYDATA message to pass data to another application.
- - Reading and writing the registry.
- - Creating a thread.
- - Creating a DLL for the hook.
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- MORE INFORMATION
- ================
-
- To use SPY to monitor messages, do the following:
-
- 1. Choose the Options menu to select the following:
-
- - Messages: Selects the messages you wish to monitor.
- - Font: Selects the font you wish to have displayed.
- - Output: Selects the output device to which you want messages to go.
-
- 2. Select the window whose messages you want to watch by choosing the
- Select Window command from the Spy menu. This brings up a dialog box
- listing the current windows to watch. The default is all windows.
-
- 3. The Edit menu allows you to use the clipboard from the SPY window.
-
- 4. Choose Start! to start monitoring. Once this option is chosen, the menu
- item changes to Stop!. Choose Stop! to cease monitoring messages.
-