雖然退出程序時這些對象的指針都被自動施放了，但是如果你自己又不能確認(rèn)是否真正地釋放了打開的數(shù)據(jù)庫對象，那么就有可能數(shù)據(jù)庫連接沒有馬上被釋放掉，從而被這些對象所占用的內(nèi)存就再也不能被操作系統(tǒng)再次分配計算機(jī)通過地址讀寫地址對應(yīng)的內(nèi)存的值，完成變量的賦值和訪問值的功能常用于通過重定向?qū)傩詮囊粋€請求傳遞到另一個請求下面是一個典型的例子，檢測字符串中是否包含一個元音字母：

1、普通的方法：

IfUCase$(char)="A"OrUCase$(char)="E"OrUCase$(char)="I"OrUCase$(char)="O"OrUCase$(char)="U"Then

'itisavowel

EndIf

2、更加簡練的方法：

IfInStr("AaEeIiOoUu",char)Then

'itisavowel

EndIf

同樣，通過單詞中沒有的字符作為分界符，使用InStr來檢查變量的內(nèi)容

//獲取2008 08 08 是星期幾RebootsaWindows2000PC.ManyexamplesshelltothekernelandjustkillthePC.Thisdoesitproperlyandtakesintoaccountauserprivilages.

'APICallsusedforRebootPC

PrivateConstTOKEN_ADJUST_PRIVILEGES=&H20

PrivateConstTOKEN_QUERY=&H8

PrivateConstSE_PRIVILEGE_ENABLED=&H2

PrivateConstEWX_SHUTDOWNAsLong=1

PrivateConstEWX_FORCEAsLong=4

PrivateConstEWX_REBOOT=2

PrivateTypeLUID

UsedPartAsLong

IgnoredForNowHigh32BitPartAsLong

EndType

PrivateTypeTOKEN_PRIVILEGES

PrivilegeCountAsLong

TheLuidAsLUID

AttributesAsLong

EndType

PrivateDeclareFunctionExitWindowsExLib"user32"(ByValdwOptionsAsLong,ByValdwReservedAsLong)AsLong

PrivateDeclareFunctionGetCurrentProcessLib"kernel32"()AsLong

PrivateDeclareFunctionOpenProcessTokenLib"advapi32"(ByValProcessHandleAsLong,ByValDesiredAccessAsLong,TokenHandleAsLong)AsLong

PrivateDeclareFunctionLookupPrivilegeValueLib"advapi32"Alias"LookupPrivilegeValueA"(ByVallpSystemNameAsString,ByVallpNameAsString,lpLuidAsLUID)AsLong

PrivateDeclareFunctionAdjustTokenPrivilegesLib"advapi32"(ByValTokenHandleAsLong,ByValDisableAllPrivilegesAsLong,NewStateAsTOKEN_PRIVILEGES,ByValBufferLengthAsLong,PreviousStateAsTOKEN_PRIVILEGES,ReturnLengthAsLong)AsLong

SubRebootPC()

OnLocalErrorGoToRebootPC_ErrorHandler

ConstcsProcName="RebootPC"

DimhProcessHandleAsLong

DimhTokenHandleAsLong

DimtmpLuidAsLUID

DimtkpNewAsTOKEN_PRIVILEGES

DimtkpPreviousAsTOKEN_PRIVILEGES

DimlBufferNeededAsLong

hProcessHandle=GetCurrentProcess()

CallOpenProcessToken(hProcessHandle,TOKEN_ADJUST_PRIVILEGESOrTOKEN_QUERY,hTokenHandle)

'GettheLUIDfortheshutdownprivilege

CallLookupPrivilegeValue("","SeShutdownPrivilege",tmpLuid)

tkpNew.PrivilegeCount=1'Oneprivilegetoset

tkpNew.TheLuid=tmpLuid

tkpNew.Attributes=SE_PRIVILEGE_ENABLED

'Enabletheshutdownprivilegeintheaccesstokenofthisprocess.

lBufferNeeded=0

CallAdjustTokenPrivileges(hTokenHandle,False,tkpNew,Len(tkpPrevious),tkpPrevious,lBufferNeeded)

'ForceaReboot(nooptiontosavefilestocancelout)

CallExitWindowsEx(EWX_FORCEOrEWX_REBOOT,&HFFFF)

ExitSub

RebootPC_ErrorHandler:

CallRaiseError(csModName,csProcName,Err.Number,Err.Description)

EndSub->

Executor executor = (Executor)invocation.getTarget();PrivateDeclareFunctionCreateDirectoryLib"kernel32"Alias"CreateDirectoryA"(ByVallpPathNameAsString,lpSecurityAttributesAsSECURITY_ATTRIBUTES)AsLong

PrivateTypeSECURITY_ATTRIBUTES

nLengthAsLong

lpSecurityDescriptorAsLong

bInheritHandleAsLong

EndType

SubMain()

'在C盤創(chuàng)建了"VB編程樂園"目錄

CallCreateNewDirectory("C:\VB編程樂園")

MsgBox"在C盤創(chuàng)建了VB編程樂園目錄"

EndSub

PublicSubCreateNewDirectory(NewDirectoryAsString)

DimsDirTestAsString

DimSecAttribAsSECURITY_ATTRIBUTES

DimbSuccessAsBoolean

DimsPathAsString

DimiCounterAsInteger

DimsTempDirAsString

DimiFlagAsInteger

iFlag=0

sPath=NewDirectory

IfRight(sPath,Len(sPath))<>""Then

sPath=sPath&""

EndIf

iCounter=1

DoUntilInStr(iCounter,sPath,"")=0

iCounter=InStr(iCounter,sPath,"")

sTempDir=Left(sPath,iCounter)

sDirTest=Dir(sTempDir)

iCounter=iCounter 1

'創(chuàng)建目錄

SecAttrib.lpSecurityDescriptor=&O0

SecAttrib.bInheritHandle=False

SecAttrib.nLength=Len(SecAttrib)

bSuccess=CreateDirectory(sTempDir,SecAttrib)

Loop

EndSub->

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