如何让用户只能同时运行一个安装程序

Put the following code in your .onInit function:

 System::Call 'kernel32::CreateMutexA(i 0, i 0, t "myMutex") i .r1 ?e'
 Pop $R0
 
 StrCmp $R0 0 +3
   MessageBox MB_OK|MB_ICONEXCLAMATION "The installer is already running."
   Abort

'myMutex' should be replaced by a unique value.