用API函数遍历指定驱动器、目录的文件

以下代码演示了如何用WindowsAPI函数遍历指定驱动器、目录的所有文件。其思路是：调出浏览文件夹窗口让用户指定所要搜索的起始路径，然后用查找文件的API函数遍历该目录下及其包含的子目录下的所有文件。本例需要：一个按钮，一个TextBox和一个ListBox，其中，TextBox应设置为多行。
核心代码参照API-Guide的两个例子程序，特此声明。

OptionExplicit

'查找第一个文件的API
PrivateDeclareFunctionFindFirstFileLib"kernel32"Alias"FindFirstFileA"(ByVallpFileNameAsString,lpFindFileDataAsWIN32_FIND_DATA)AsLong
'查找下一个文件的API
PrivateDeclareFunctionFindNextFileLib"kernel32"Alias"FindNextFileA"(ByValhFindFileAsLong,lpFindFileDataAsWIN32_FIND_DATA)AsLong
'获取文件属性的API
PrivateDeclareFunctionGetFileAttributesLib"kernel32"Alias"GetFileAttributesA"(ByVallpFileNameAsString)AsLong
'关闭查找文件的API
PrivateDeclareFunctionFindCloseLib"kernel32"(ByValhFindFileAsLong)AsLong
'以下为调用浏览文件夹窗口的API
PrivateDeclareSubCoTaskMemFreeLib"ole32.dll"(ByValhMemAsLong)
PrivateDeclareFunctionlstrcatLib"kernel32"Alias"lstrcatA"(ByVallpString1AsString,ByVallpString2AsString)AsLong
PrivateDeclareFunctionSHBrowseForFolderLib"shell32"(lpbiAsBrowseInfo)AsLong
PrivateDeclareFunctionSHGetPathFromIDListLib"shell32"(ByValpidListAsLong,ByVallpBufferAsString)AsLong

'常量
ConstMAX_PATH=260
ConstMAXDWORD=&HFFFF
ConstINVALID_HANDLE_VALUE=-1
ConstFILE_ATTRIBUTE_ARCHIVE=&H20
ConstFILE_ATTRIBUTE_DIRECTORY=&H10
ConstFILE_ATTRIBUTE_HIDDEN=&H2
ConstFILE_ATTRIBUTE_NORMAL=&H80
ConstFILE_ATTRIBUTE_READONLY=&H1
ConstFILE_ATTRIBUTE_SYSTEM=&H4
ConstFILE_ATTRIBUTE_TEMPORARY=&H100
ConstBIF_RETURNONLYFSDIRS=1
PrivateTypeFILETIME
dwLowDateTimeAsLong
dwHighDateTimeAsLong
EndType

'定义类(用于查找文件)
PrivateTypeWIN32_FIND_DATA
dwFileAttributesAsLong
ftCreationTimeAsFILETIME
ftLastAccessTimeAsFILETIME
ftLastWriteTimeAsFILETIME
nFileSizeHighAsLong
nFileSizeLowAsLong
dwReserved0AsLong
dwReserved1AsLong
cFileNameAsString*MAX_PATH
cAlternateAsString*14
EndType

'定义类(用于浏览文件夹窗口)
PrivateTypeBrowseInfo
hWndOwnerAsLong
pIDLRootAsLong
pszDisplayNameAsLong
lpszTitleAsLong
ulFlagsAsLong
lpfnCallbackAsLong
lParamAsLong
iImageAsLong
EndType

'自定义函数
FunctionStripNulls(OriginalStrAsString)AsString
If(InStr(OriginalStr,Chr(0))>0)Then
OriginalStr=Left(OriginalStr,InStr(OriginalStr,Chr(0))-1)
EndIf
StripNulls=OriginalStr
EndFunction

'自定义函数
FunctionFindFilesAPI(pathAsString,SearchStrAsString,FileCountAsInteger,_
DirCountAsInteger)
DimFileNameAsString'文件名
DimDirNameAsString'子目录名
DimdirNames()AsString'目录数组
DimnDirAsInteger'当前路径的目录数
DimiAsInteger'循环计数器变量
DimhSearchAsLong'搜索句柄变量
DimWFDAsWIN32_FIND_DATA
DimContAsInteger
IfRight(path,1)<>"\"Thenpath=path&"\"
'搜索子目录
nDir=0
ReDimdirNames(nDir)
Cont=True
hSearch=FindFirstFile(path&"*",WFD)
IfhSearch<>INVALID_HANDLE_VALUEThen
DoWhileCont
DirName=StripNulls(WFD.cFileName)
If(DirName<>".")And(DirName<>"..")Then
IfGetFileAttributes(path&DirName)AndFILE_ATTRIBUTE_DIRECTORYThen
dirNames(nDir)=DirName
DirCount=DirCount 1
nDir=nDir 1
ReDimPreservedirNames(nDir)
EndIf
EndIf
Cont=FindNextFile(hSearch,WFD)'获取下一个子目录
Loop
Cont=FindClose(hSearch)
EndIf
'遍历目录并累计文件总数
hSearch=FindFirstFile(path&SearchStr,WFD)
Cont=True
IfhSearch<>INVALID_HANDLE_VALUEThen
WhileCont
FileName=StripNulls(WFD.cFileName)
If(FileName<>".")And(FileName<>"..")Then
FindFilesAPI=FindFilesAPI (WFD.nFileSizeHigh*MAXDWORD) WFD.nFileSizeLow
FileCount=FileCount 1
List1.AddItempath&FileName
EndIf
Cont=FindNextFile(hSearch,WFD)'获取下一个文件
Wend
Cont=FindClose(hSearch)
EndIf
'如果子目录存在则遍历之
IfnDir>0Then
Fori=0TonDir-1
FindFilesAPI=FindFilesAPI FindFilesAPI(path&dirNames(i)&"\",_
SearchStr,FileCount,DirCount)
Nexti
EndIf
EndFunction

'查找按钮代码
SubCommand1_Click()
DimSearchPathAsString,FindStrAsString
DimFileSizeAsLong
DimNumFilesAsInteger,NumDirsAsInteger
DimiNullAsInteger,lpIDListAsLong,lResultAsLong
DimsPathAsString,udtBIAsBrowseInfo
WithudtBI
'设置浏览窗口
.hWndOwner=Me.hWnd
'返回选中的目录
.ulFlags=BIF_RETURNONLYFSDIRS
EndWith

'调出浏览窗口
lpIDList=SHBrowseForFolder(udtBI)
IflpIDListThen
sPath=String$(MAX_PATH,0)
'获取路径
SHGetPathFromIDListlpIDList,sPath
'释放内存
CoTaskMemFreelpIDList
iNull=InStr(sPath,vbNullChar)
IfiNullThen
sPath=Left$(sPath,iNull-1)
EndIf
EndIf

Screen.MousePointer=vbHourglass
List1.Clear
SearchPath=sPath'选中的目录为搜索的起始路径
FindStr="*.*"'搜索所有类型的文件(此处可另作定义)
FileSize=FindFilesAPI(SearchPath,FindStr,NumFiles,NumDirs)
Text1.Text="查找到的文件数："&NumFiles&vbCrLf&"查找的目录数："&_
NumDirs 1&vbCrLf&"文件大小总共为："&vbCrLf&_
Format(FileSize,"#,###,###,##0")&"字节"
Screen.MousePointer=vbDefault
EndSub->