COM RCW 上的地址引用

发布于 2024-08-29 11:08:12 字数 483 浏览 4 评论 0原文

是否可以增加未知接口上的 RCW 引用计数？（即不是底层 COM 对象的引用计数）

我有一些旧的 COM 服务器代码

int Method1(object comobject) {
    try {
        // do something with comobject
        return 0;
    }
    finally {
        Marshal.ReleaseComObject(comobject);
    }
 }

此代码工作正常，但现在我需要从另一个方法调用它。

int Method2(object comobject) {
    int result = Method1(comobject);
    // Do something with combject
}

comobject 的类型会有所不同（这就是它是 object 的原因）

原文

Is it possible to increase the RCW reference count on an unknown interface?
(i.e. not the reference count on the underlying COM object)

I have some old COM server code

int Method1(object comobject) {
    try {
        // do something with comobject
        return 0;
    }
    finally {
        Marshal.ReleaseComObject(comobject);
    }
 }

This code works fine but now I need to call it from another method.

int Method2(object comobject) {
    int result = Method1(comobject);
    // Do something with combject
}

The type of comobject will vary (that is why it is object)

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ㄖ落Θ余辉 2024-09-05 11:08:12

有一种方法，RCW 计数计算对象已被封送的次数，您可以通过执行额外的封送来增加此数字。

public static T AddRcwRef<T>(T t) 
{
    IntPtr ptr = Marshal.GetIUnknownForObject(t);
    try {
        return (T)Marshal.GetObjectForIUnknown(ptr);
    }
    finally {
         Marshal.Release(ptr); // done with the IntPtr
    }
}

我不确定是否会推荐使用此方法，最好尝试摆脱 ReleaseComObject 调用。

如需进一步阅读，请参阅我撰写的关于该主题的博客文章。

There is a way, the RCW count counts how many times the object has been marshaled you can increase this number by performing an additional marshal.

public static T AddRcwRef<T>(T t) 
{
    IntPtr ptr = Marshal.GetIUnknownForObject(t);
    try {
        return (T)Marshal.GetObjectForIUnknown(ptr);
    }
    finally {
         Marshal.Release(ptr); // done with the IntPtr
    }
}

I'm not sure I would recommend using this method, it's probably better to try and get rid of your ReleaseComObject calls.

For further reading, see this blog post on the subject I wrote.

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