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关于vb.netget文件的信息

VB.NET获取目录文件夹名称

先用System.IO.Directory.GetDirectories函数获取子目录的名称(包括其路径),再用System.IO.Path.GetFileName获取子目录的名称。下面是代码:

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Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

For Each s In System.IO.Directory.GetDirectories("C:\Windows")

Console.WriteLine(System.IO.Path.GetFileName(s))

Next

End Sub

下面是部分输出:

Application Data

AppPatch

assembly

BOCNET

Boot

Branding

ConfigSetRoot

Cursors

Debug

DigitalLocker

Downloaded Installations

Downloaded Program Files

ehome

en-US

Fonts

Globalization

Help

...

可能有更简洁的方法,你可以到MSDN看看

System.IO.Directory.GetDirectories:

System.IO.Path.GetFileName:

通用 I/O 任务:

vb.net从文件路径中获取文件名

获取方法,参考实例如下:

'获取路径名各部分:

如:

c:\dir1001\aaa.txt

'获取路径路径

c:\dir1001\

Public

Function

GetFileName(FilePathFileName

As

String)

As

String

'获取文件名

aaa.txt

On

Error

Resume

Next

Dim

i

As

Integer,

J

As

Integer

i

Len(FilePathFileName)

J

InStrRev(FilePathFileName,

"\")

GetFileName

Mid(FilePathFileName,

J

+

1,

i)

End

Function

''获取路径路径

c:\dir1001\

Public

Function

GetFilePath(FilePathFileName

As

String)

As

String

'获取路径路径

c:\dir1001\

On

Error

Resume

Next

Dim

J

As

Integer

J

InStrRev(FilePathFileName,

"\")

GetFilePath

Mid(FilePathFileName,

1,

J)

End

Function

'获取文件名但不包括扩展名

aaa

Public

Function

GetFileNameNoExt(FilePathFileName

As

String)

As

String

'获取文件名但不包括扩展名

aaa

On

Error

Resume

Next

Dim

i

As

Integer,

J

As

Integer,

k

As

Integer

i

Len(FilePathFileName)

J

InStrRev(FilePathFileName,

"\")

k

InStrRev(FilePathFileName,

".")

If

k

Then

GetFileNameNoExt

Mid(FilePathFileName,

J

+

1,

i

-

J)

Else

GetFileNameNoExt

Mid(FilePathFileName,

J

+

1,

k

-

J

-

1)

End

If

End

Function

'=====

'获取扩展名

.txt

Public

Function

GetFileExtName(FilePathFileName

As

String)

As

String

'获取扩展名

.txt

On

Error

Resume

Next

Dim

i

As

Integer,

J

As

Integer

i

Len(FilePathFileName)

J

InStrRev(FilePathFileName,

".")

If

J

Then

GetFileExtName

".txt"

Else

GetFileExtName

Mid(FilePathFileName,

J,

i)

End

If

End

Function

vb.net 二进制读取文件

VB.NET打开二进制文件用fileopen完成,打开二进制文件的形式为:openmode.binary

读取二进制文件用的是fileget方法,写入二进制文件用的是fileput方法。

应用示例:将一批随机数保存在一个dat文件中,然后再将其提取到文本框中。

二进制文件的读写一批随机数的存取,程序为:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim x, i, fn As Integer

Dim s As String = ""

fn = FreeFile()

FileOpen(fn, "d:\data.dat", OpenMode.Binary)

For i = 1 To 8

x = Int(Rnd() * 100)

s = s + Str(x)

FilePut(fn, x)

Next

FileClose(fn)

TextBox1.Text = s

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim x, fn As Integer

Dim s As String = ""

fn = FreeFile()

FileOpen(fn, "d:\data.dat", OpenMode.Binary)

Do While Not EOF(fn)

FileGet(fn, x)

s = s + Str(x) + " "

Loop

FileClose(fn)

TextBox1.Text = s

End Sub


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