從啓動進程獲取窗口處理程序

Question

我看到有win32process.GetWindowThreadProcess()獲取窗口處理程序並返回它的進程ID。有沒有辦法做相反的事情：通過它的進程ID獲取正在運行的進程的窗口處理程序？像win32gui.GetWindowHandler(processId)？

具體是什麼，我試圖做的事：

我有一個運行外部程序Python腳本，讓說的notepad.exe。
當調用runProgram()方法時，記事本被觸發。我想防止此方法多次運行記事本。我做到這一點以如下方式，使用win32process：

import win32process as process 
import sys 

PORTABLE_APPLICATION_LOCATION = "C:\\Windows\\system32\\notepad.exe" 
processHandler = -1 

def runProgram(): 
    global processHandler 
    #don't run a process more than once 
    if (isLiveProcess(processHandler)): 
     #Bring focus back to running window! 
     return; 
    try: 
     startObj = process.STARTUPINFO() 
     myProcessTuple = process.CreateProcess(PORTABLE_APPLICATION_LOCATION,None,None,None,8,8,None,None,startObj) 
     processHandler = myProcessTuple[2] 
    except: 
     print(sys.exc_info[0]) 

def isLiveProcess(processHandler): #Process handler is dwProcessId 
    processList = process.EnumProcesses() 
    for aProcess in processList: 
     if (aProcess == processHandler): 
      return True 
    return False 

runProgram() 

可正常工作，但如果該進程被發現是已經活着，我希望把它的窗口後到前與win32gui

Answer 1

我不認爲Windows API爲此提供了一種方法，但是您可以遍歷所有打開的窗口，並找到屬於您的窗口。

我已經修改了你的程序，所以它看起來是這樣的：

import win32process 
import win32process as process 
import win32gui 
import sys 

PORTABLE_APPLICATION_LOCATION = "C:\\Windows\\system32\\notepad.exe" 
processHandler = -1 


def callback(hwnd, procid): 
    if procid in win32process.GetWindowThreadProcessId(hwnd): 
     win32gui.SetForegroundWindow(hwnd) 

def show_window_by_process(procid): 
    win32gui.EnumWindows(callback, procid) 


def runProgram(): 
    global processHandler 
    #don't run a process more than once 
    if (isLiveProcess(processHandler)): 
     #Bring focus back to running window! 
     show_window_by_process(processHandler) 
     return; 
    try: 
     startObj = process.STARTUPINFO() 
     myProcessTuple = process.CreateProcess(PORTABLE_APPLICATION_LOCATION,None,None,None,8,8,None,None,startObj) 
     processHandler = myProcessTuple[2] 
    except: 
     print(sys.exc_info[0]) 

def isLiveProcess(processHandler): #Process handler is dwProcessId 
    processList = process.EnumProcesses() 
    for aProcess in processList: 
     if (aProcess == processHandler): 
      return True 
    return False 

runProgram()