Allow only one installer instance: Difference between revisions
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(Note about minimized initial installer) |
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== The advanced way == | == The advanced way == | ||
This code will bring the already running instance to front, instead of opening a new one. | This code will bring the already running instance to front, instead of opening a new one. | ||
Side Note (Jamyn): Strangely, if the user has first minimized the installer, and then tries to launch another copy, the following code will correctly set the first installer as the active window, but won't "pop" it back up from being minimized. Not sure how to do that simply, but that may be useful. | |||
<highlight-nsis> | <highlight-nsis> | ||
System::Call "kernel32::CreateMutexA(i 0, i 0, t '$(^Name)') i .r0 ?e" | System::Call "kernel32::CreateMutexA(i 0, i 0, t '$(^Name)') i .r0 ?e" | ||
Revision as of 16:19, 10 March 2006
| Author: Vytautas (talk, contrib) |
Description
The best way is to use a kernel mutex. You can call the Win32 API using the System plug-in. Put this code in the .onInit function:
The Script
System::Call 'kernel32::CreateMutexA(i 0, i 0, t "myMutex") i .r1 ?e' Pop $R0 StrCmp $R0 0 +3 MessageBox MB_OK "The installer is already running." Abort
'myMutex' should be replaced with a unique value.
The advanced way
This code will bring the already running instance to front, instead of opening a new one. Side Note (Jamyn): Strangely, if the user has first minimized the installer, and then tries to launch another copy, the following code will correctly set the first installer as the active window, but won't "pop" it back up from being minimized. Not sure how to do that simply, but that may be useful.
System::Call "kernel32::CreateMutexA(i 0, i 0, t '$(^Name)') i .r0 ?e" Pop $0 StrCmp $0 0 launch StrLen $0 "$(^Name)" IntOp $0 $0 + 1 loop: FindWindow $1 '#32770' '' 0 $1 IntCmp $1 0 +4 System::Call "user32::GetWindowText(i r1, t .r2, i r0) i." StrCmp $2 "$(^Name)" 0 loop System::Call "user32::SetForegroundWindow(i r1) i." Abort launch:
