Marshal.GetActiveObject(String) 方法

定義

命名空間:

System.Runtime.InteropServices

組件:

mscorlib.dll

從執行物件表格 (Running Object Table，ROT) 取得指定之物件的執行中執行個體。

public:
 static System::Object ^ GetActiveObject(System::String ^ progID);

[System.Security.SecurityCritical]
public static object GetActiveObject (string progID);

[<System.Security.SecurityCritical>]
static member GetActiveObject : string -> obj

Public Shared Function GetActiveObject (progID As String) As Object

參數

progID

String

要求之物件的程式設計識別項 (ProgID)。

傳回

Object

要求的物件；否則為 null。 您可以將這個物件轉換為其支援的任何 COM 介面。

屬性

SecurityCriticalAttribute

例外狀況

COMException

找不到物件。

範例

下列範例是在使用執行中 Microsoft Word 實例所設定的電腦上執行。 沒有執行 Microsoft Excel 的實例。

此範例會呼叫 GetActiveObject 兩次。 第一次呼叫會嘗試擷取 Microsoft Word 實例的參考， (對象實例 Word.Application) 。 第二個呼叫會嘗試擷取 Microsoft Excel 實例的參考， (對象實例 Excel.Application) 。

程序代碼會成功擷取 Microsoft Word 實例的參考。 不過，因為 Microsoft Excel 未執行，所以嘗試擷取第二個 COMException物件會引發 。

using System;
using System.Runtime.InteropServices;

class MainFunction
{
    static void Main()
        {
        Console.WriteLine("\nSample: C# System.Runtime.InteropServices.Marshal.GetActiveObject.cs\n"); 

        GetObj(1, "Word.Application");
        GetObj(2, "Excel.Application");
        }

    static void GetObj(int i, String progID)
    {
        Object obj = null;

        Console.WriteLine("\n" +i+") Object obj = GetActiveObject(\"" + progID + "\")");
        try
           { obj = Marshal.GetActiveObject(progID); }
        catch (Exception e)
           {
           Write2Console("\n   Failure: obj did not get initialized\n" + 
                         "   Exception = " +e.ToString().Substring(0,43), 0); 
           }
 
        if (obj != null)
           { Write2Console("\n   Success: obj = " + obj.ToString(), 1 ); }
    }

    static void Write2Console(String s, int color)
        {
        Console.ForegroundColor = color == 1? ConsoleColor.Green : ConsoleColor.Red;
        Console.WriteLine(s); 
        Console.ForegroundColor = ConsoleColor.Gray;
    }
}

/*
Expected Output:

Sample: C# System.Runtime.InteropServices.Marshal.GetActiveObject.cs

1) Object obj = GetActiveObject("Word.Application")

   Success: obj = System.__ComObject

2) Object obj = GetActiveObject("Excel.Application")

   Failure: obj did not get initialized
   Exception = System.Runtime.InteropServices.COMException
*/

Imports System.Runtime.InteropServices

Module Module1

    Sub Main()
        Console.WriteLine(vbcrlf + "Sample: VB System.Runtime.InteropServices.Marshal.GetActiveObject.vb" + vbcrlf) 
        GetObj(1, "Word.Application")
        GetObj(2, "Excel.Application")
    End Sub


    Sub GetObj(ByVal i As Integer, ByVal progID As [String])
        Dim obj As [Object] = Nothing
        
        Console.WriteLine((vbLf & i & ") Object obj = GetActiveObject(""") + progID & """)")
        Try
            obj = Marshal.GetActiveObject(progID)
        Catch e As Exception
            Write2Console((vbLf & "   Failure: obj did not get initialized" & vbLf & "   Exception = ") + e.ToString().Substring(0, 43), 0)
        End Try
        
        If obj IsNot Nothing Then
            Write2Console(vbLf & "   Success: obj = " & obj.ToString(), 1)
        End If
    End Sub

    Sub Write2Console(ByVal s As [String], ByVal color As Integer)
        Console.ForegroundColor = If(color = 1, ConsoleColor.Green, ConsoleColor.Red)
        Console.WriteLine(s)
        Console.ForegroundColor = ConsoleColor.Gray
    End Sub

End Module

'Expected Output:
'
'Sample: VB System.Runtime.InteropServices.Marshal.GetActiveObject.vb
'
'1) Object obj = GetActiveObject("Word.Application")
'
'   Success: obj = System.__ComObject
'
'2) Object obj = GetActiveObject("Excel.Application")
'
'   Failure: obj did not get initialized
'   Exception = System.Runtime.InteropServices.COMException
'

備註

如需此 API 的詳細資訊，請參閱 Marshal.GetActiveObject 的補充 API 備註。