FindWindow在Windows 7中返回0

我有一个C＃程序。该程序创建一个Adobe Reader进程并打印一个PDF文档。它工作在Windows XP中正常，但在Windows 7我已经检查不工作的AcroRd32.exe路径是正确的在Windows 7的FindWindow方法总是返回0在Windows 7FindWindow在Windows 7中返回0

[DllImport("user32.dll")] 
    public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow); 

    [DllImport("User32.dll")] 
    public static extern IntPtr FindWindow(string ClassN, string WindN); 

    [DllImport("user32.dll", EntryPoint = "SendMessageA")] 
    private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam); 

    [DllImport("user32.dll", SetLastError = true)] 
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow); 

    [DllImport("shell32.dll ")] 
    public static extern int ShellExecute(IntPtr hwnd, string lpszOp, string lpszFile, string lpszParams, string lpszDir, int FsShowCmd); 

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)] 
    public static extern uint WinExec(string lpCmdLine, uint uCmdShow); 

    public bool isAcrobatExsists(string acrobatLoc) 
    { 
     IntPtr currentHandle = getWindowHandlerByClass("AcrobatSDIWindow"); 
     if (currentHandle != IntPtr.Zero) 
     { 
      return true; 
     } 
     return false; 
    } 

    private static IntPtr getWindowHandlerByClass(string className) 
    { 
     IntPtr currentHandle = FindWindow(className, null); 
     return currentHandle; 
    } 

    private static IntPtr getWindowHandlerByName(string appName) 
    { 
     IntPtr currentHandle = FindWindow(null, appName); 
     return currentHandle; 
    }

来源

2014-01-08 user3171372

你是如何调用'getWindowHandlerByName（）'？我启动了Adobe Reader X，运行你的代码（调用'getWindowHandlerByName（“Adobe Reader”）;'），并找回了一个有效的句柄。 –

我试过了。它仍然返回0。 – user3171372