用VB怎么计算远程服务器上的延迟
因为服务器禁止ping，所以想用vb编写个程序可以获得他返回的延迟，比如15ms这样 --------------------编程问答--------------------Option Explicit--------------------编程问答-------------------- 楼上的这位兄弟，服务器是禁止ping的，你的方式是用ping，无法满足要求，呵呵，不好意思 --------------------编程问答-------------------- 没人知道吗 --------------------编程问答-------------------- 是否可以用timer+transfer来实现啊？ --------------------编程问答-------------------- 用其他端口的方式去获取，换个思路 --------------------编程问答-------------------- 如果能以某种方式访问服务器，则应该可以，否则应该不行吧？
Private Const NORMAL_PRIORITY_CLASS = &H20&
Private Const STARTF_USESTDHANDLES = &H100&
Private Const STARTF_USESHOWWINDOW = &H1
Private Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type
Private Type STARTUPINFO
cb As Long
lpReserved As Long
lpDesktop As Long
lpTitle As Long
dwX As Long
dwY As Long
dwXSize As Long
dwYSize As Long
dwXCountChars As Long
dwYCountChars As Long
dwFillAttribute As Long
dwFlags As Long
wShowWindow As Integer
cbReserved2 As Integer
lpReserved2 As Long
hStdInput As Long
hStdOutput As Long
hStdError As Long
End Type
Private Type PROCESS_INFORMATION
hProcess As Long
hThread As Long
dwProcessID As Long
dwThreadID As Long
End Type
Private Declare Function CreatePipe Lib "kernel32" (phReadPipe As Long, phWritePipe As Long, lpPipeAttributes As SECURITY_ATTRIBUTES, ByVal nSize As Long) As Long
Private Declare Function CreateProcess Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As SECURITY_ATTRIBUTES, lpThreadAttributes As SECURITY_ATTRIBUTES, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, ByVal lpBuffer As String, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Sub Form_Load()
MsgBox retunCmdResult("ping www.baidu.com") '这里会显示ping返回的信息，用纯字符串处理即可。
End Sub
Public Function retunCmdResult(strCommand As String) As String
Dim Proc As PROCESS_INFORMATION '进程信息
Dim Start As STARTUPINFO '启动信息
Dim SecAttr As SECURITY_ATTRIBUTES '安全属性
Dim hReadPipe As Long '读取管道句柄
Dim hWritePipe As Long '写入管道句柄
Dim lngBytesRead As Long '读出数据的字节数
Dim strBuffer As String * 256 '读取管道的字符串buffer
Dim Command As String 'DOS命令
Dim ret As Long 'API函数返回值
Dim lpOutputs As String '读出的最终结果
'设置安全属性
With SecAttr
.nLength = LenB(SecAttr)
.bInheritHandle = True
.lpSecurityDescriptor = 0
End With
'创建管道
ret = CreatePipe(hReadPipe, hWritePipe, SecAttr, 0)
If ret = 0 Then
MsgBox "无法创建管道", vbExclamation, "错误"
Exit Function
End If
'设置进程启动前的信息
With Start
.cb = LenB(Start)
.dwFlags = STARTF_USESHOWWINDOW Or STARTF_USESTDHANDLES
.hStdOutput = hWritePipe '设置输出管道
.hStdError = hWritePipe '设置错误管道
End With
'启动进程
Command = strCommand 'DOS进程以ipconfig.exe为例
ret = CreateProcess(vbNullString, Command, SecAttr, SecAttr, True, NORMAL_PRIORITY_CLASS, ByVal 0, vbNullString, Start, Proc)
If ret = 0 Then
MsgBox "无法启动新进程", vbExclamation, "错误"
ret = CloseHandle(hWritePipe)
ret = CloseHandle(hReadPipe)
Exit Function
End If
'因为无需写入数据，所以先关闭写入管道。而且这里必须关闭此管道，否则将无法读取数据
ret = CloseHandle(hWritePipe)
'从输出管道读取数据，每次最多读取256字节
Do
ret = ReadFile(hReadPipe, strBuffer, 256, lngBytesRead, ByVal 0)
lpOutputs = lpOutputs & Left(strBuffer, lngBytesRead)
DoEvents
Loop While (ret <> 0) '当ret=0时说明ReadFile执行失败，已经没有数据可读了
'读取操作完成，关闭各句柄
ret = CloseHandle(Proc.hProcess)
ret = CloseHandle(Proc.hThread)
ret = CloseHandle(hReadPipe)
retunCmdResult = lpOutputs
End Function
long t0
t0=gettickcount
访问服务器过程
msgbox "延时:"+cstr(gettickcount-t0)
补充：VB , 网络编程
