当我们在卸载程序或者更新安装程序时，我们需要先将运行的进程杀掉再进行安装或者卸载程序。NSIS本身并没有提供杀掉进程的脚本，但是有一个插件可以实现此功能，插件的名字叫KillProcDLL，插件下载地址为http://nsis.sourceforge.net/KillProcDLL_plug-in。插件的用法请参考插件页面所提供的内容。下面给出在安装包中的代码：

;This callback will be called when the installer is nearly finished initializing. If the '.onInit' function calls Abort, the installer will quit instantly Function .onInit KillProcDLL::KillProc "myprogram.exe" FunctionEnd ;This callback is called when the user hits the 'cancel' button after the install has failed (if it could not extract a file, or the install script used the Abort command). Function .onInstFailed ExecShell "open" "$INSTDIRmyprogram.exe" FunctionEnd ;This callback will be called when the uninstaller is nearly finished initializing. If the 'un.onInit' function calls Abort, the uninstaller will quit instantly. Note that this function can verify and/or modify $INSTDIR if necessary. Function un.onInit   MessageBox MB_ICONQUESTION|MB_YESNO|MB_DEFBUTTON2 "Are you sure you want to uninstall $(^Name) and its componments?" IDYES NoAbort IDYES +2   Abort NoAbort: KillProcDLL::KillProc "myprogram.exe" FunctionEnd

　　本文中的方法仅供参考，在使用过程中请自行修改此脚本。

转载原文地址：http://bcoder.com/others/kill-process-when-install-or-uninstall-programs-by-the-package-made-by-nsis