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# ctrx_execute_on_window

Example | General Functions

Specifies handler function on window appearance.

`void ctrx_execute_on_window( char *window_name, long handler );`

window_name | The name of the window that initiates the handler.
handler | The function to invoke when the window is displayed.

ctrx_execute_on_window specifies the function to call when a window appears. When a window with the name window_name appears, the handler function is invoked.

ctrx_execute_on_window is typically used to handle a popup dialog box.

The asterisk wildcard character (*) can be used in window_name.

Put the actions you wish to perform in the handler function, which must have the following prototype:

int handler( char *title);

The name of the window is passed to the handler as title argument..

Note:

- We recommend including a think time after the handler function is invoked, especially if it is invoked at the end of the Actions section of a Vuser script. If the handler function is invoked at the end of the Actions section and is not followed by a think time, the vuser_end logoff procedure may be executed before the handler function is completed.
- The lr_rendezvous function is not supported when a ctrx_execute_on_window function is pending.

## Return Values

This function has no return value.

## Parameterization

No parameterization is available for this function.

## Example

This example shows the definition and use of an event handler function, close_unsaved_changes.

When exiting the Microsoft Word application with an open document containing unsaved changes, a Yes-No-Cancel message window with the title "Microsoft Word" appears prompting the user to save the document.

ctrx_execute_on_window specifies that when this dialog appears, the function close_unsaved_changes is invoked. This function tabs through to the dialog's "No" button and hits the "Enter" key, thereby exiting the application without saving.

Copy code

    int close_unsaved_changes(char win_title[]) {    /* Note: the parameter win_title is not used in the handler */
        ctrx_key("TAB_KEY", 0, CTRX_LAST); /* tab through to "No" button */
        ctrx_key("ENTER_KEY", 0, CTRX_LAST); /* hit the "No" button */

        return 0;
    }

    vuser_init () {

    /* If "Microsoft Word" popup appears then close it*/
        ctrx_execute_on_window("Microsoft Word", close_unsaved_changes);
        ctrx_set_connect_opt(APPLICATION, "#word");
        ctrx_set_connect_opt(NETWORK_PROTOCOL, "TCP/IP");
        ctrx_connect_server("ludens", "test", "test", "ludens");
        ctrx_wait_for_event("LOGON");
        ctrx_set_window("Document1 - Microsoft Word", CTRX_LAST);
        ctrx_type("This is a test", CTRX_LAST);
        lr_think_time(3);

        /* Close MS Word by clicking the X button of the title bar. This will cause the "Microsoft Word" unsaved changes dialog window to appear */
        ctrx_mouse_click(28, 38, LEFT_BUTTON, 0, "Document1 - Microsoft Word", CTRX_LAST);
        lr_think_time(1);
        ctrx_mouse_click(43, 404, LEFT_BUTTON, 0, "Document1 - Microsoft Word", CTRX_LAST);
        lr_think_time(5);
        ctrx_disconnect_server("ludens", CTRX_LAST);

        return 0;
    }

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