根据进程名获取进程PID以及进程

今天，帮人解答问题时，用VB.NET写了段根据进程名称查找PID的方法。

以前用VB6时积累的API发挥了作用，主要在VB.NET处理API声明时注意一下把所有的long改成Integer,同时如果有Any的话也需要改成Object。

VB6的Long对应VB.NET的Integer。如果混了，会报错的。

既然写了，就记录一下，便于后面使用

Module Module1
Private Const GW_HWNDNEXT = 2
Private Const GW_CHILD = 5
Private Declare Function GetDesktopWindow Lib "user32" () As Integer
Private Declare Function GetParent Lib "user32" (ByVal hwnd As Integer) As Integer
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Integer, ByVal wCmd As Integer) As Integer
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Integer, ByRef lpdwProcessId As Integer) As Integer
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Integer, ByVal lpString As String, ByVal cch As Integer) As Integer
Private Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA"  (ByVal hwnd As Integer) As Integer
'进程名，不带.exe danielinbiti
Public Function ProcessPidOnly(ByVal ProcessName As String) As String
Dim myProcess As Process() = Process.GetProcessesByName(ProcessName)
Dim pid As String = ""
Dim windowname As String = ""
If myProcess.Length - 1 = 0 Then
pid = myProcess(0).Id
Else
For i As Short = 0 To myProcess.Length - 1
pid = pid & myProcess(i).Id & ";"
Next
End If
If Trim(pid) <> "" Then
Dim hwnd As Integer
Dim pidArr = pid.Split(";")
For i As Short = 0 To pidArr.Length - 1
If Trim(pidArr(i)) <> "" Then
hwnd = GetWinHandle(CInt(pidArr(i)))
windowname = windowname + vbCrLf + getWindowName(hwnd)
End If
Next i
End If
ProcessPidOnly = windowname
End Function
Private Function GetWinHandle(ByVal hInstance As Integer) As Integer
Dim tempHwnd As Integer
Dim test_pid As Integer
Dim test_thread_id As Integer
GetWinHandle = 0
tempHwnd = GetDesktopWindow()
tempHwnd = GetWindow(tempHwnd, GW_CHILD)
' Loop until you find a match or there are no more window handles:
Do Until tempHwnd = 0
' Check for PID match
' 取该窗口所属的进程ID
If GetParent(tempHwnd) = 0 Then
test_thread_id = GetWindowThreadProcessId(tempHwnd, test_pid)
If test_pid = hInstance Then
' Return found handle
GetWinHandle = tempHwnd
' Exit search loop
Exit Do
End If
End If
' Get the next window handle
tempHwnd = GetWindow(tempHwnd, GW_HWNDNEXT)
Loop
End Function
Private Function getWindowName(ByVal hwnd As Integer)
Dim sTitle As String = ""
Dim nSize As Integer
nSize = GetWindowTextLength(hwnd)
If nSize > 0 Then

sTitle = Space$(nSize + 1)
GetWindowText(hwnd, sTitle, nSize + 1)
End If
getWindowName = sTitle
End Function

End Module