问个问题,CreateFile函数第四个参数怎么理解?

[yuezifeng]

Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As SECURITY_ATTRIBUTES, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long


总是提示用户定义类型不能用

'获取句柄
lngHandle = CreateFile("d:\MOV030.MOI", GENERIC_READ, FILE_SHARE_READ Or FILE_SHARE_WRITE, ByVal 0&, OPEN_EXISTING, 0, 0)

[VBAdvisor]

Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, ByVal lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long

Read file:
Access = GENERIC_READ
Share = FILE_SHARE_READ
Disposition = OPEN_EXISTING
Flags = FILE_ATTRIBUTE_ARCHIVE Or FILE_ATTRIBUTE_HIDDEN Or FILE_ATTRIBUTE_NORMAL Or FILE_ATTRIBUTE_READONLY Or FILE_ATTRIBUTE_SYSTEM
lGetFileHandle = CreateFile(FileName, Access, Share, ByVal 0&, Disposition, Flags, 0&)

Write file:
Access = GENERIC_READ Or GENERIC_WRITE
Share = 0&
Flags = GetFileAttributes(FileName)

If Flags < 0& Then Flags = FILE_ATTRIBUTE_NORMAL
' CREATE_ALWAYS will delete previous file if necessary
Disposition = CREATE_ALWAYS
lGetFileHandle = CreateFile(FileName, Access, Share, ByVal 0&, Disposition, Flags, 0&)

[chenhui530]

Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long

这样声明就行了