NSIS—程序互斥函数（只能运行一个安装程序，安装时不能卸载）

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CheckMutex.nsi

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;NSIS 安装程序与卸载程序互相检查互斥的例子

;编写：zhfi

#定义自己的互斥名称：#

#注意安：装程序不能与卸载程序相同！#

!define MyMutex_Install "MyMutex_Install"

!define MyMutex_UnInstall "MyMutex_UnInstall"
!include "LogicLib.nsh"

;安装程序部分
Function .onInit

InitPluginsDir

Call CreateMutex

FunctionEnd

Function CreateMutex

#检查安装互斥：#

ReCheck:

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${MyMutex_Install}") i .R1 ?e'

Pop $R0

System::Call 'kernel32::CloseHandle(i R1) i.s'

#检查卸载互斥：#

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${MyMutex_UnInstall}") i .R3 ?e'

Pop $R2

System::Call 'kernel32::CloseHandle(i R3) i.s'

#判断安装/卸载互斥的存在#

${If} $R0 != 0

MessageBox MB_RetryCancel|MB_ICONEXCLAMATION "安装程序已经运行！" IdRetry ReCheck

Quit

${ElseIf} $R2 != 0

MessageBox MB_RetryCancel|MB_ICONEXCLAMATION "卸载程序已经运行！" IdRetry ReCheck

Quit

${Else}

#创建安装互斥：#

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${MyMutex_Install}") i .R1 ?e'

Pop $R0

StrCmp $R0 0 +2

Quit

${EndIf}

FunctionEnd

;卸载程序部分
Function un.onInit

InitPluginsDir

Call un.CreateMutex

FunctionEnd

Function Un.CreateMutex

#检查安装互斥：#

ReCheck:

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${MyMutex_Install}") i .R1 ?e'

Pop $R0

System::Call 'kernel32::CloseHandle(i R1) i.s'

#检查卸载互斥：#

CheckUnInstall:

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${MyMutex_UnInstall}") i .R3 ?e'

Pop $R2

System::Call 'kernel32::CloseHandle(i R3) i.s'

#判断安装/卸载互斥的存在#

${If} $R0 != 0

MessageBox MB_RetryCancel|MB_ICONEXCLAMATION "安装程序已经运行！" IdRetry ReCheck

Quit

${ElseIf} $R2 != 0

MessageBox MB_RetryCancel|MB_ICONEXCLAMATION "卸载程序已经运行！" IdRetry ReCheck

Quit

${Else}

#创建卸载互斥：#

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${MyMutex_UnInstall}") i .R1 ?e'

Pop $R0

StrCmp $R0 0 +2

Quit

${EndIf}

FunctionEnd