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When my Web browser control navigates to some websites it fires various events of Document Completion. Once I have what I need in WebBrowser_Document_Completed() I want to ignore all further Document Completion.
If I show a MessageBox() in Document_Completed(...), It shows multiple message boxes, looks like it is running in parallel threads, but when I debug it I find that it runs always on main thread.
Also, when I press Close it closes the window but the process is still running in the background. I am not using any other thread yet I still see two other threads when I debug.
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The main difference between the two functions is that GetMessage does not return until a message matching the filter criteria is placed in the queue, whereas PeekMessage returns immediately regardless of whether a message is in the queue.
The message loop is an obligatory section of code in every program that uses a graphical user interface under Microsoft Windows. Windows programs that have a GUI are event-driven. Windows maintains an individual message queue for each thread that has created a window. Usually only the first thread creates windows.
Message queues is used to route mouse and keyboard input to the appropriate window. Nonqueued messages are sent immediately to the destination window procedure, bypassing the system message queue and thread message queue.
The MsgBox is a dialog box in the excel VBA that can be used to inform the users of your program. It displays a pop-up style message box and waits for the user to click a button, and then an action is performed based on the clicked button by the user.
The most direct way to do this will be to intercept and evaluate messages being propagated to your control by overriding it's WndProc() method. With a little bit of debugger observation you can identify the wm_message constant that corresponds to your target event and then alter execution flow accordingly. There is a pretty good example of this on the MSDN site: https://msdn.microsoft.com/en-us/library/system.windows.forms.control.wndproc%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
To get an idea of the message(s) you are seeing/looking for, reference: http://www.pinvoke.net/default.aspx/Constants/WM.html
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