Enhanced FindWindow for variable window class names: Difference between revisions
From NSIS Wiki
Jump to navigationJump to search
m (Adding new author and category links.) |
No edit summary |
||
| (9 intermediate revisions by 5 users not shown) | |||
| Line 2: | Line 2: | ||
== Introduction == | == Introduction == | ||
Sometimes, you want to send messages to a window, that you don't know the full window class name (wcn) of, or it contains variables and you know the constant part. So you can't use FindWindow | Sometimes, you want to send messages to a window, that you don't know the full window class name (wcn) of, or it contains variables and you know the constant part. So you can't use FindWindow because it doesn't support wildcards. | ||
This function doesn't too. But you can get the handle of any window, | This function doesn't too. But you can get the handle of any window, with only one known part of the wcn. | ||
== Usage == | == Usage == | ||
<highlight-nsis> | <highlight-nsis> | ||
Push | Push 0 # the starting offset of the push below | ||
Push | Push "Application" # the known part of the class name | ||
Call EnhancedFindWindow | Call EnhancedFindWindow | ||
Pop $0 # will contain the | Pop $0 # will contain the full wcn | ||
Pop $1 # will | Pop $1 # will contain the window's handle | ||
# both will | # both will contain "failed", if no matching class name was found | ||
</highlight-nsis> | </highlight-nsis> | ||
| Line 20: | Line 19: | ||
Function EnhancedFindWindow | Function EnhancedFindWindow | ||
; input, save variables | ; input, save variables | ||
Exch $0 # part of the | Exch $0 # part of the class name to search for | ||
Exch | Exch | ||
Exch $1 # starting offset | Exch $1 # starting offset | ||
Push $2 # length of $0 | Push $2 # length of $0 | ||
Push $3 | Push $3 # window handle | ||
Push $4 # class name | |||
Push $ | Push $5 # temp | ||
Push $ | |||
; set up the variables | ; set up the variables | ||
StrCpy $4 0 | |||
StrLen $2 $0 | |||
StrCpy $4 0 | |||
; loop to search for open windows | ; loop to search for open windows | ||
search_loop: | search_loop: | ||
FindWindow $ | FindWindow $3 "" "" 0 $3 | ||
IntCmp $ | IntCmp $3 0 search_failed | ||
IsWindow $ | IsWindow $3 0 search_loop | ||
System::Call | System::Call 'user32.dll::GetClassName(i r3, t .r4, i ${NSIS_MAX_STRLEN}) i .n' | ||
StrCmp $4 0 search_loop | |||
StrCpy $5 $4 $2 $1 | |||
StrCmp $0 $5 search_end search_loop | |||
; no matching class-name found, return "failed" | ; no matching class-name found, return "failed" | ||
search_failed: | search_failed: | ||
StrCpy $3 "failed" | |||
StrCpy $4 "failed" | StrCpy $4 "failed" | ||
; search ended, output and restore variables | ; search ended, output and restore variables | ||
search_end: | search_end: | ||
StrCpy $1 $3 | StrCpy $1 $3 | ||
StrCpy $0 $4 | StrCpy $0 $4 | ||
Pop $5 | Pop $5 | ||
Pop $4 | Pop $4 | ||
Latest revision as of 13:29, 12 February 2011
| Author: Comm@nder21 (talk, contrib) |
Introduction
Sometimes, you want to send messages to a window, that you don't know the full window class name (wcn) of, or it contains variables and you know the constant part. So you can't use FindWindow because it doesn't support wildcards. This function doesn't too. But you can get the handle of any window, with only one known part of the wcn.
Usage
Push 0 # the starting offset of the push below Push "Application" # the known part of the class name Call EnhancedFindWindow Pop $0 # will contain the full wcn Pop $1 # will contain the window's handle # both will contain "failed", if no matching class name was found
The Function
Function EnhancedFindWindow ; input, save variables Exch $0 # part of the class name to search for Exch Exch $1 # starting offset Push $2 # length of $0 Push $3 # window handle Push $4 # class name Push $5 # temp ; set up the variables StrCpy $4 0 StrLen $2 $0 ; loop to search for open windows search_loop: FindWindow $3 "" "" 0 $3 IntCmp $3 0 search_failed IsWindow $3 0 search_loop System::Call 'user32.dll::GetClassName(i r3, t .r4, i ${NSIS_MAX_STRLEN}) i .n' StrCmp $4 0 search_loop StrCpy $5 $4 $2 $1 StrCmp $0 $5 search_end search_loop ; no matching class-name found, return "failed" search_failed: StrCpy $3 "failed" StrCpy $4 "failed" ; search ended, output and restore variables search_end: StrCpy $1 $3 StrCpy $0 $4 Pop $5 Pop $4 Pop $3 Pop $2 Exch $1 Exch Exch $0 FunctionEnd
Feedback
Any suggestions, feature requests or even bug reports? Feel free to send me an email or a private message.
Please post any other question, e.g. about usage and customization at the NSIS forums. Remember: You're not alone ...
Further Reading
See this topic for more information about the function itself and alternatives. See the msdn for more information about the user32 api call "GetClassName".
