Allow only one installer instance: Difference between revisions
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'myMutex' should be replaced with a unique value. | 'myMutex' should be replaced with a unique value. | ||
== The advanced way == | |||
This code will bring the already running instance to front, instead of open a new one. | |||
<highlight-nsis> | |||
System::Call "kernel32::CreateMutexA(i 0, i 0, t '$(^Name)') i .r0 ?e" | |||
Pop $0 | |||
StrCmp $0 0 launch | |||
StrLen $0 "$(^Name)" | |||
loop: | |||
FindWindow $1 '#32770' '' 0 $1 | |||
IntCmp $1 0 +4 | |||
System::Call "user32.dll::GetWindowText(i r1, t .r2, i $0) i." | |||
StrCmp $2 "$(^Name)" 0 loop | |||
System::Call "user32::SetWindowPos(i r1, i -1, i 0, i 0, i 0, i 0, i 0x02|0x01) i." | |||
Abort | |||
launch: | |||
</highlight-nsis> | |||
Page author: [[User:Vytautas|Vytautas]] | Page author: [[User:Vytautas|Vytautas]] | ||
Revision as of 17:12, 23 April 2005
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 $R0 0 +3 MessageBox MB_OK "The installer is already running." Abort
'myMutex' should be replaced with a unique value.
The advanced way
This code will bring the already running instance to front, instead of open a new one.
System::Call "kernel32::CreateMutexA(i 0, i 0, t '$(^Name)') i .r0 ?e" Pop $0 StrCmp $0 0 launch StrLen $0 "$(^Name)" loop: FindWindow $1 '#32770' '' 0 $1 IntCmp $1 0 +4 System::Call "user32.dll::GetWindowText(i r1, t .r2, i $0) i." StrCmp $2 "$(^Name)" 0 loop System::Call "user32::SetWindowPos(i r1, i -1, i 0, i 0, i 0, i 0, i 0x02|0x01) i." Abort launch:
Page author: Vytautas
