Microsoft.Office.Interop错误0x800401E3

问题描述：

我试图通过我的服务访问Microsoft word实例但我收到此错误

操作不可用（HRESULT异常：0x800401E3（MK_E_UNAVAILABLE）） ，

我已打开word文档（我也可以在任务管理器中看到WINWORD.EXE），

我正在使用VS 2010和MS Office 2003.这里是我的代码

I am trying to access Microsoft word instance through my service but I am getting this error
Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE)) ,
I have opened word document ( i can also see WINWORD.EXE in Task Manager) ,
I am using VS 2010 and MS Office 2003. Here is my code

Dim fs As New FileStream("D:\log.txt", FileMode.OpenOrCreate, FileAccess.Write)
        Dim sw As New StreamWriter(fs)
        sw.BaseStream.Seek(0, SeekOrigin.End)
        Dim wordapp As Word.Application
        wordapp = Marshal.GetActiveObject("Word.Application")
        For Each doc As Word.Document In wordapp.Documents
            sw.WriteLine(doc.FullName.ToString() + "\n" +
            doc.ActiveWindow.WindowState.ToString())
        Next
        sw.Flush()
        sw.Close()

如果我在Windows窗体应用程序中使用此代码它完美，但在Windows服务中不起作用。为什么这样做？ Windows服务不支持Microsoft.Office.Interop？如果确实有效，请指导。

if i use this code in windows form application it works perfect, but doesn’t works in windows service.Why is that for ? Windows Service Doesn’t support Microsoft.Office.Interop ? If it does work please guide.

答

使用您的凭据运行您的服务 - 否则它将无法访问使用您的凭据运行的Word。

Run your service with your credentials - otherwise it won't be able to access Word running with your credentials.

Add reference only of "Microsoft.Office.Interop.Excel.dll"
try
        {
 //This requires excel app (excel.exe*32) to be running means any excel sheet should be open. If excel not running then it will throw error.
            excelApp = (Excel.Application)Marshal.GetActiveObject("Excel.Application");
            excelApp.Visible = false;
        }
        catch
        {
            //create new excel instance
            excelApp = new Excel.Application();
            excelApp.Visible = false;
        }
This worked for me.
Advantage: No need to copy Microsoft.Office.Interop.Excel.dll to your installed foler. Since MS excel is installed it will take from GAC.

I used Office.dll too but not sure if its really required.

Microsoft.Office.Interop错误0x800401E3

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