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C# COM 服务器到 C# COM 客户端使用 CoCreateInstance

转载 作者:行者123 更新时间:2023-11-30 23:14:14 25 4
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我需要创建一个 C# COM 服务器和一个 C# COM 客户端,并使用 CoCreateInstance 在两者之间进行通信。

这样客户端可以是 64 位的,服务器可以是 32 位的,使用 Hosting a .NET DLL as an Out-Of-Process COM Server (EXE) 中描述的“DllSurrogate”方法。 .

但是,目前我都有 32 位版本,但正在努力让它工作。

有创建 C# COM 服务器的在线示例:COM Interop Part 2: C# Server Tutorial

并创建一个 C# COM 客户端:COM Interop Part 1: C# Client Tutorial

但我还没有找到同时执行这两种操作的示例。到目前为止,我的尝试都失败了,我怀疑用于 C# COM 客户端示例的 Microsoft COM 服务器包含 C# COM 服务器示例中没有的额外规范。

我目前的尝试如下。
C# 客户端对 CoCreateInstance 的调用显然是成功的,但返回的对象似乎是空的(不是 null),并且尝试将其转换为接口(interface)失败。

任何人都可以发现问题,或提供一个完全结合的例子吗?

这是我的服务器代码:

// AntCsServer.cs
// Project settings:
// compile as a library
// Select 'Make assembly COM Visible'
// Select 'Register for COM Interop'

using System;
using System.Runtime.InteropServices;
namespace AntCsServer
{
// Since the .NET Framework interface and coclass have to behave as
// COM objects, we have to give them guids.
[Guid("555E2D2B-EE00-47AA-AB2B-39F953F6B339")]
public interface IManagedInterface
{
int PrintHi(string name);
}

[Guid("0190D7A6-8D8D-4031-810A-627BA3EE68A6")]
public class InterfaceImplementation : IManagedInterface
{
public int PrintHi(string name)
{
Console.WriteLine("Hello, {0}!", name);
return 33;
}
}
}

这是我的客户端代码:

using System;
using System.Runtime.InteropServices;

namespace ComClient
{
class Program
{
public const string ComSvrInterface_GUID = "555E2D2B-EE00-47AA-AB2B-39F953F6B339";
public const string ComSvrClass_GUID = "0190D7A6-8D8D-4031-810A-627BA3EE68A6";

[STAThread]
static void Main(string[] args)
{
Ole32Methods.CoInitialize((IntPtr)0);

object instance1 = null;
string sErr1;
bool b1;
IManagedInterface cCom = null;

b1 = Ole32Methods.CreateComObject(ComSvrClass_GUID, ComSvrInterface_GUID, out instance1, out sErr1);

if (b1)
{
cCom = instance1 as IManagedInterface;
}

if (cCom != null)
{
cCom.PrintHi("Santa Claus");
Console.WriteLine("Should have just printed Santa Claus");
}

}
}

// -------------------------------------------

// Reproduce the interface here so we can cast to it
[Guid("555E2D2B-EE00-47AA-AB2B-39F953F6B339")]
public interface IManagedInterface
{
int PrintHi(string name);
}

// -------------------------------------------

public class Ole32Methods
{
[DllImport("ole32.Dll")]
static public extern uint CoCreateInstance(ref Guid clsid,
[MarshalAs(UnmanagedType.IUnknown)] object inner,
uint context,
ref Guid uuid,
[MarshalAs(UnmanagedType.IUnknown)] out object rReturnedComObject);

[DllImport("ole32.dll")]
public static extern int CoInitialize(IntPtr pvReserved);

// ------------------------

public static bool CreateComObject(string sClassGuid, string sInterfaceGuid, out object instance, out string sErr)
{
const uint CLSCTX_INPROC_SERVER = 1;
//const uint CLSCTX_LOCAL_SERVER = 4;

// CLSID of the COM object
Guid clsid = new Guid(sClassGuid);

// GUID of the required interface
//Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
Guid IID_Interface = new Guid(sInterfaceGuid);

instance = null;

uint hResult = Ole32Methods.CoCreateInstance(ref clsid, null,
CLSCTX_INPROC_SERVER, ref IID_Interface, out instance);


// Some error codes. See 'winerror.h for more, and use the following to convert the debug value to Hex: http://www.rapidtables.com/convert/number/decimal-to-hex.htm

const uint S_OK = 0x00000000; //Operation successful
const uint E_NOTIMPL = 0x80004001; //Not implemented
const uint E_NOINTERFACE = 0x80004002; //No such interface supported
const uint E_POINTER = 0x80004003; //Pointer that is not valid
const uint E_ABORT = 0x80004004; //Operation aborted
const uint E_FAIL = 0x80004005; //Unspecified failure
const uint E_UNEXPECTED = 0x8000FFFF; //Unexpected failure
const uint E_ACCESSDENIED = 0x80070005; //General access denied error
const uint E_HANDLE = 0x80070006; //Handle that is not valid
const uint E_OUTOFMEMORY = 0x8007000E; //Failed to allocate necessary memory
const uint E_INVALIDARG = 0x80070057; //One or more arguments are not valid

const uint E_CLASSNOTREG = 0x80040154; // Class not registered

sErr = "";
switch (hResult)
{
case S_OK:
sErr = "";
break;
case E_NOTIMPL:
sErr = "E_NOTIMPL: Not implemented";
break;
case E_NOINTERFACE:
sErr = "E_NOINTERFACE: No such interface supported";
break;
case E_POINTER:
sErr = "E_POINTER: Pointer that is not valid";
break;
case E_ABORT:
sErr = "E_ABORT: Operation aborted";
break;
case E_FAIL:
sErr = "E_FAIL: Unspecified failure";
break;
case E_UNEXPECTED:
sErr = "E_UNEXPECTED: Unexpected failure";
break;
case E_ACCESSDENIED:
sErr = "E_ACCESSDENIED: General access denied error";
break;
case E_HANDLE:
sErr = "E_HANDLE: Handle that is not valid";
break;
case E_OUTOFMEMORY:
sErr = "E_OUTOFMEMORY: Failed to allocate necessary memory";
break;
case E_INVALIDARG:
sErr = "E_INVALIDARG: One or more arguments are not valid";
break;

case E_CLASSNOTREG:
sErr = "E_CLASSNOTREG: Class not registered";
break;
}

return hResult == 0;

}

}
}

最佳答案

您正在加载进程中的 COM 服务器。这会导致 CLR 在进程中加载​​您的程序集,因此它使用标准程序集加载来加载它。您从 CoCreateInstance 获得的结果对象是文字 AntCsServer.InterfaceImplementation 类,它在服务器 DLL 中实现接口(interface),而不是在客户端 EXE 中实现接口(interface)。

这可以通过检查从 CoCreateInstance 返回的对象的类型来确认。如果它是 System.__ComObject,您将获得一个真正的 COM 对象(.NET 对象的代理对象)。如果不是,那么问题就是我所描述的——您实际上得到的是程序集类型的一个实例。

关于C# COM 服务器到 C# COM 客户端使用 CoCreateInstance,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43229302/

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