NSIS打包的软件开启时已安装检测机制

#-- 根据 NSIS 脚本编辑规则，所有 Function 区段必须放置在 Section 区段之后编写，以避免安装程序出现未可预知的问题。--#
Function .onInit
 
        ;检查重复运行
   System::Call 'kernel32::CreateMutexA(i 0, i 0, t "MicroSetup") i .r1 ?e'
 
 
  ;;安装程序已经运行
 
  StrCmp $R1 0 +3
   ;MessageBox MB_OK|MB_ICONINFORMATION|MB_TOPMOST "程序已经在运行。"
   Abort
 Push $0
 Push $1
   ReadRegStr $0 HKLM ${PRODUCT_UNINST_KEY} "UninstallString"
   ReadRegStr $1 HKLM ${PRODUCT_UNINST_KEY} "DisplayVersion"
   StrCmp $0 "" onInit.End
 
  IfFileExists $0 0 onInit.End

  ;;杀死安装包启动的程序;;
 
  KillProcDLL::KillProc "${PRODUCT_NAME}.exe" 

 
  MessageBox MB_YESNO|MB_ICONQUESTION "检测到系统已经安装了${PRODUCT_NAME} $1。$\r$\n继续之前必须先执行卸载,继续吗?" IDNO onInit.GoAbort

   # 静默卸载
   IfFileExists "$DESKTOP\${PRODUCT_NAME}.lnk" 0 +2
         Delete "$DESKTOP\${PRODUCT_NAME}.lnk"
         IfFileExists "$SMPROGRAMS\${PRODUCT_NAME} $1\${PRODUCT_NAME}.lnk" 0 +4
           Delete "$SMPROGRAMS\${PRODUCT_NAME} $1\${PRODUCT_NAME}.lnk"
           Delete "$SMPROGRAMS\${PRODUCT_NAME} $1\Uninstall.lnk"
           RMDir "$SMPROGRAMS\${PRODUCT_NAME} $1"
         IfFileExists "$SMPROGRAMS\${PRODUCT_NAME}\${PRODUCT_NAME}.lnk" 0 +4
                 Delete "$SMPROGRAMS\${PRODUCT_NAME}\${PRODUCT_NAME}.lnk"
           Delete "$SMPROGRAMS\${PRODUCT_NAME}\Uninstall.lnk"
 
          RMDir "$SMPROGRAMS\${PRODUCT_NAME}"
  ;;删除文件夹和文件;;
 
  RMDir /r "$INSTDIR\platforms"
   RMDir /r "$INSTDIR\imageformats"
   RMDir /r "$INSTDIR\iconengines"
   RMDir /r "$INSTDIR\bearer"
   RMDir /r "$INSTDIR\*.*"
   RMDir /r "$INSTDIR\..\${PRODUCT_NAME}"
   RMDir /r "$INSTDIR"

   MessageBox MB_OK "卸载完成！"
   Goto Next
 onInit.GoAbort:
     Abort
 onInit.End:
   Pop $1
   Pop $0
 Next:
ExecShell "" "${PRODUCT_NAME}_${PRODUCT_VERSION}.exe"
 FunctionEnd