如果有多个 NSIS 实例，请采取措施

Question

I am trying to take certain actions based on the number of NSIS instances running.

If there is only one instance does it perform an action, if there are two or more does it perform another

You can check if multiple instances of a process are running and take actions through "if" and "else"?

Thank you

Answer 1

!include LogicLib.nsh
!define INSTALLERMUTEXNAME "TODO: Replace this, your GUID goes here!" ; Get one from guidgen.com

Function .onInit
System::Call 'KERNEL32::CreateMutex(p0, i1, t"${INSTALLERMUTEXNAME}")?e'
Pop $0
${If} $0 = 183 ; ERROR_ALREADY_EXISTS?
  MessageBox MB_OK "Two or more"
${Else}
  MessageBox MB_OK "I'm alone"
${EndIf}
FunctionEnd

Answer 2

Section "REGISTRY"

        !include "Registry.nsh"        
    
    *    !define REGISTRYKEY1 "HKEY_CURRENT_USER\Software\MyApp"        
    *    !define PORTABLEKEY1 "$EXEDIR\User\MyApp.reg"        
    
        ${registry::DeleteKey} "${REGISTRYKEY1}-BackupBy${APPNOSPACE}Portable" $R0    
        Sleep 200                    
    
        ${registry::MoveKey} "${REGISTRYKEY1}" "${REGISTRYKEY1}-BackupBy${APPNOSPACE}Portable" $R0
        Sleep 200                    
    
        ${registry::RestoreKey} "${PORTABLEKEY1}" $R0    
        Sleep 200                        
    
    SectionEnd 


     Section "APPDATA"
    
    *    !define APPDATADIR1 "$APPDATA\MyApp"                
    *    !define PORTABLEDIR1 "$EXEDIR\User\MyApp"    
    
        RMDir "/r" "${APPDATADIR1}-BackupBy${APPNOSPACE}Portable"        
        Rename "${APPDATADIR1}" "${APPDATADIR1}-BackupBy${APPNOSPACE}Portable"    
    
        CreateDirectory "${APPDATADIR1}"                
        CopyFiles /SILENT "${PORTABLEDIR1}\*.*" "${APPDATADIR1}"    
    
    SectionEnd