Allow only one installer instance: Difference between revisions
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== The advanced way == | == The advanced way == | ||
This code will bring the already running instance to front, instead of | This code will bring the already running instance to front, instead of opening a new one. | ||
<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 10:23, 10 November 2005
| 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 $R0 0 +3 MessageBox MB_OK "The installer is already running." Abort
'myMutex' should be replaced with a unique value.
The advanced way
This code will bring the already running instance to front, instead of opening a new one.
System::Call "kernel32::CreateMutexA(i 0, i 0, t '$(^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:
