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The SendMsg utility is used to post messages to various windows in the Windows operating system using the built-in messaging subsystem. Messages which can be posted include, (but are not limited to) closing, hiding, resizing, and user-defined messages as well. If you are not familiar with how the messaging system works, please consult the Windows SDK, or the Microsoft MSDN library for more information, specifically the SendMessage and PostMessage and related system calls.
The utility is designed to run from a command line. It has no graphical output. Messages can be posted to windows based on their title text, class name, or handle.
In addition to posting messages, this utility can also be used to list windows which match a certain criteria.
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The format of the command line is as follows: (this information is also available by running the SENDMSG with the /? parameter)
SendMsg {switches} [SearchStr] {Message} {wParam} {lParam}
Switches:
/CLASS or /TEXT Specify whether to search for window classname or title
/NOWAIT Post message without waiting for result
/[IN]VISIBLE Include only [in]visible windows
/TOP Include only top-level windows
/PAUSExxx Delay for xxx seconds after sending each message
/EXAMPLES Show example command lines
SearchStr String to search for. Wildcards ? and * allowed
SearchStr is NOT case sensitive
Use "double quotations" if SearchStr contains spaces
Message Message to send. If omitted, find windows only
Constants in CONST.TXT [+/- offset] allowed
wParam wParam parameter. If omitted, use "0" as default
lParam lParam parameter. If omitted, use "0" as default
All numeric values can be listed in either decimal or $hexadecimal.
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