[英]Calling a C# dll from C++ using CoCreateInstance
My ProjectA a C#
class library with one single class : 我的ProjectA是一个C#
类库,只有一个类:
namespace myLib
{
// Interface declaration.
[Guid("Some GUID")]
[InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface ICsClass
{
[DispId(1)]
int Add(int Number1, int Number2);
};
[Guid("Some GUID")]
[ClassInterface(ClassInterfaceType.None)]
[ProgId("myLib.CsClas")]
public class CsClas : ICsClass
{
public int Add(int a, int b)
{
return a + b;
}
}
}
I have checked Register for com interop
using VS2010
which generated dll
& tlb
files for me, Ok until now. 我已经使用VS2010
检查了Register for com interop
,它为我生成了dll
& tlb
文件,好的,到目前为止。
My ProjectB a Win32 Dll
application with single cpp
file: 我的ProjectB是带有单个cpp
文件的Win32 Dll
应用程序:
#import "MyLib.tlb" raw_interfaces_only
using namespace MyLib;
............... ...............
#ifdef __cplusplus
extern "C"{
#endif
__declspec(dllexport) long Add(int a,int b)
{
CoInitialize(NULL);
long lResult = 0;
// Use Smart pointer
CComQIPtr <ICsClass> spCoClass;
if (SUCCEEDED (spCoClass.CoCreateInstance(L"myLib.CsClas")))
{
spCoClass->Add(a,b,&lResult);
wprintf(L"The result is %d\n", lResult);
std::cout << "#"+lResult << '\n';
}
CoUninitialize();
return lResult;
}
#ifdef __cplusplus
}
#endif
....... .......
Iam able to compile this Dll and everything looks ok until now. 我能够编译此Dll,并且到目前为止一切正常。
Question when I use my Win32 Dll & try calling the Add function this line : 当我使用Win32 Dll并尝试在此行中调用Add函数时出现问题:
SUCCEEDED (spCoClass.CoCreateInstance(L"myLib.CsClas"))
Never gets passed, What might be the issue, Didnt it resgistered properly? 永远不会过去,这可能是问题所在,它没有正确地重新装好吗?
Kindly assist. 请协助。
The code as written doesn't give you a good way to diagnose the failure. 编写的代码无法为您提供诊断故障的好方法。 Write it like this instead: 改为这样写:
HRESULT hr = spCoClass.CoCreateInstance(L"myLib.CsClas");
if (SUCCEEDED(hr)) {
// etc..
}
A common error code is 0x80040154, "Class not registered". 常见的错误代码是0x80040154,“类未注册”。 Etcetera. 等等。
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