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Closing Window Instances

Posted on 1998-08-30
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Last Modified: 2010-04-02
Does any one know how to close all instances of a window, like Internet Exlporer or Netscape Navigator for example. I would prefer an example of C++ code. I know it has something to do with findWindow() or findWindowEx().
Can any one help?

Thanks
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Question by:bsugden
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by:bsugden
ID: 1171578
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alexo earned 100 total points
ID: 1171579
You have two options.

You can use FindWindow() in a loop.  FindWindow() returns a top-level window that matches the requested title and/or class.  The problem is, the title of NS or IE usually changes to reflect the page it currently views and the class can depend on the version.  The loop will look like this:
    HWND hwnd;
    while ((hwnd = FindWindow(title, class) != NULL)
        DestroyWindow(hwnd);

A more flexible approach is to use EnumWindows().  EnumWindows() loops over all top-level windows and passes their handles to a user-specified function.  That function can get the title of the window, the class, the position or any other property.  It can compare substrings and do whatever it likes.

    EnumWindows(EnumWindowsProc, NULL);


    BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
    {
        /* Do whatever you want with the handle */
        return TRUE;
    }

Much more flexible but a bit less efficient.
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by:alexo
ID: 1171580
An example:

        #define SUBSTRING "Notepad"

        #define STRICT
        #include <windows.h>

        BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam);

        int main()
        {
            EnumWindows(EnumWindowsProc, NULL);
            return 0;
        }

        BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
        {
            char buffer[512];
            GetWindowText(hwnd, buffer, sizeof buffer);
            if (strstr(buffer, SUBSTRING))
                SendMessage(hwnd, WM_SYSCOMMAND, SC_MINIMIZE, 0);
                // or: ShowWindow(hwnd, SW_MINIMIZE);
            return TRUE;
        }

Modify as needed.
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Expert Comment

by:alexo
ID: 1171581
And the autograder hits again!
Thank you so much for your consideration.
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