Option Explicit
' Copyright ? 1997 by Desaware Inc. All Rights Reserved
Dim DemoFile$
Private Const NORMAL_PRIORITY_CLASS = &H20 '如果进程位于前台，则基本值是9；如果在后台，则优先值为7
Private Const INFINITE = &HFFFFFFFF
Private Const WAIT_TIMEOUT = &H102& '对象保持未发出信号的状态，但等待超时时间已经超过
'说明∶PROCESS_INFORMATION结构由CreateProcess函数将关于新建立的进程和
'主要线索的信息写入其中成员变量
Private Type PROCESS_INFORMATION '
hProcess As Long
hThread As Long
dwProcessId As Long
dwThreadId As Long
End Type
'说明∶STARTUPINFO结构用在CreateProcess函数中指定为新进程建立的新窗口的主要属性。这一
'一信息影响由CreateWindows函数建立的第一个窗口
Private Type STARTUPINFO
cb As Long
lpReserved As String
lpDesktop As String
lpTitle As String
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 Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function CreateProcess Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, ByVal lpProcessAttributes As Long, ByVal lpThreadAttributes As Long, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDirectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function WaitForInputIdle Lib "user32" (ByVal hProcess As Long, ByVal dwMilliseconds As Long) As Long
Private Sub command1_Click()
Dim res&
Dim sinfo As STARTUPINFO
Dim pinfo As PROCESS_INFORMATION
sinfo.cb = Len(sinfo)
sinfo.lpReserved = vbNullString
sinfo.lpDesktop = vbNullString
sinfo.lpTitle = vbNullString
sinfo.dwFlags = 0
Label1.Caption = "正在启动程序"
Label1.Refresh
' CreateProcess函数，用于创建一个新的进程
res = CreateProcess(DemoFile, vbNullString, 0, 0, True, _
NORMAL_PRIORITY_CLASS, ByVal 0&, vbNullString, sinfo, pinfo)
If res Then
Label1.Caption = "程序正在运行"
WaitForTerm pinfo
End If
Label1.Caption = "程序已经结束"
End Sub
Private Sub WaitForTerm(pinfo As PROCESS_INFORMATION)
Dim res&
' 等待指定的进程进入空闲状态，,空闲(Idle)指的是进程准备处理
'一条消息、但目前暂时没有消息需要处理的一种状态
Call WaitForInputIdle(pinfo.hProcess, INFINITE)
' 关闭指定进程
Call CloseHandle(pinfo.hThread)
Command1.Enabled = False
Label1.Refresh
Do
'等待发出信号
res = WaitForSingleObject(pinfo.hProcess, 0)
If res <> WAIT_TIMEOUT Then '如果对象发出了信号
Exit Do
End If
DoEvents
Loop While True
Command1.Enabled = True
Call CloseHandle(pinfo.hProcess)
End Sub
Private Sub Form_Load()
DemoFile = InputBox$("请输入需要运行的程序名", , "C:\WINDOWS\notepad.exe")
End Sub
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