无法将__delegate指针传递给C ++函数？ [英] Cannot pass a __delegate pointer to C++ function?
问题描述
我将__delegate ptrs传递给DLL中的本机C函数没有问题，
但是当试图将__delegate ptr传递给本机C ++函数时
在DLL中我得到以下运行时异常：未处理的异常
类型''System.EntryPointNotFoundException''。
如果入口点是没找到，我想我会在链接期间得到一个未解决的符号错误。此外，我可以
成功地将void，int *和函数指针等传递给C ++ DLL
函数，但是当尝试传递__delegate时，这个错误仍然存在>
指针，用于回调托管C ++函数。
这是相关的代码片段 - DLL代码只包含
$ b $的存根b这里调用的函数：
#include" stdafx.h"
#using< mscorlib.dll>
using namespace System;
using namespace System :: Runtime :: InteropServices;
__delegate void testCB（）;
[DllImport（" unmdll.dll"）]
void fnunmdll_2（testCB * UpdateProgMeter）;
int fnunmdll_0（void）;
void fnunmdll_1（int * x）; // testCB * UpdateProgMeter）;
__gc class C1
{
public：
static void handleCB（）
{
return;
}
};
in t _tmain（）
{
int k = 9;
//总是有效（与C / C ++一样）< br $>
fnunmdll_0（）;
//总是有效（和C / C ++一样）
fnunmdll_1（& k）;
testCB * pCB = new testCB（0，& C1 :: handleCB）;
//如果这是一个C ++函数，期待一个函数指针，
出现上述错误。如果这是一个外部的C。功能，一切都好！
fnunmdll_2（pCB）;
返回0;
}
听起来很疯狂，我开始认为这不可能用原生C ++函数来实现
。
谢谢提前，乔治
I have no trouble passing __delegate ptrs to native C functions in DLLs,
however when attempting to pass the __delegate ptr to a native C++ function
in a DLL I get the following runtime exception: An unhandled exception of
type ''System.EntryPointNotFoundException''.
This is confusing b/c if the entry point was not found, I would think I''d
get an unresolved symbol error during linking. Furthermore, I can
successfully pass void, int *, and function pointers, etc to C++ DLL
functions, but this error persists when attempting to pass a __delegate
pointer, which is used for callbacks to managed C++ functions.
Here is the relevant code snippet - the DLL code simply contains stubs of
the functions called here:
#include "stdafx.h"
#using <mscorlib.dll>
using namespace System;
using namespace System::Runtime::InteropServices;
__delegate void testCB();
[DllImport("unmdll.dll")]
void fnunmdll_2(testCB *UpdateProgMeter);
int fnunmdll_0(void);
void fnunmdll_1(int *x);//testCB *UpdateProgMeter);
__gc class C1
{
public:
static void handleCB()
{
return;
}
};
int _tmain()
{
int k = 9;
//always works (as both C/C++)
fnunmdll_0();
//always works (as both C/C++)
fnunmdll_1(&k);
testCB *pCB = new testCB(0, &C1::handleCB);
//if this is a C++ function expecting a function pointer, the
aforementioned error occurs. If this is an extern "C" function, all is ok!
fnunmdll_2(pCB);
return 0;
}
As crazy as it sounds, I''m beginning to think this is not possible to do
with native C++ functions.
Thanks in advance, George
推荐答案
这与代表无关，这是一个C ++名称重整问题，
你的DllImport函数（fnunmdll_2）必须使用C链接导出，或者一个
相应的.DEF文件。
externC
{
....
}
威利。
" ; glutz7878" < GL ******* @ discussions.microsoft.com>在消息中写道
news：42 ********************************** @ microsof t.com ...
This has nothing to do with delegates, this is a C++ name mangling issue,
your DllImport functions (fnunmdll_2) must use C linkage exports, or an
appropriate .DEF file.
extern "C"
{
....
}
Willy.
"glutz7878" <gl*******@discussions.microsoft.com> wrote in message
news:42**********************************@microsof t.com...
我将__delegate ptrs传递给DLL中的本机C函数没有问题，但是当试图将__delegate ptr传递给本机C ++
函数时在DLL中我得到以下运行时异常：
类型''System.EntryPointNotFoundException''的未处理异常。
如果入口点不是b / c这会令人困惑发现，我认为在链接过程中我会得到一个未解决的符号错误。此外，我可以成功地将void，int *和函数指针等传递给C ++ DLL
函数，但是当尝试传递__delegate
指针时，此错误仍然存在，该指针用于回调管理C ++函数。
这是相关的代码片段 - DLL代码只包含这里调用函数的存根：
#include" stdafx。 h"
#using< mscorlib.dll>
使用命名空间系统;
使用命名空间System :: Runtime :: InteropServices;
__delegate void testCB（）;
[DllImport（" unmdll.dll"）]
void fnunmdll_2（testCB * UpdateProgMeter）;
int fnunmdll_0（void）;
void fnunmdll_1（int * x）; // testCB * UpdateProgMeter）;
__gc class C1
{
public：
static void handleCB（）
{
返回;
}
};
int _tmain（）
{
int k = 9;
//总是有效（和C / C ++一样）
fnunmdll_0（）;
//总是有效（和C / C ++一样）
fnunmdll_1（& k）;
testCB * pCB = new testCB（0，& C1 :: handleCB）;
//如果这是一个期望函数指针的C ++函数，则会发生上述错误。如果这是一个外部的C。功能，一切都好了！
fnunmdll_2（pCB）;
返回0;
}
听起来很疯狂，我我开始认为用原生C ++函数做这个是不可能的。
提前谢谢，George
I have no trouble passing __delegate ptrs to native C functions in DLLs,
however when attempting to pass the __delegate ptr to a native C++
function
in a DLL I get the following runtime exception: An unhandled exception of
type ''System.EntryPointNotFoundException''.
This is confusing b/c if the entry point was not found, I would think I''d
get an unresolved symbol error during linking. Furthermore, I can
successfully pass void, int *, and function pointers, etc to C++ DLL
functions, but this error persists when attempting to pass a __delegate
pointer, which is used for callbacks to managed C++ functions.
Here is the relevant code snippet - the DLL code simply contains stubs of
the functions called here:
#include "stdafx.h"
#using <mscorlib.dll>
using namespace System;
using namespace System::Runtime::InteropServices;
__delegate void testCB();
[DllImport("unmdll.dll")]
void fnunmdll_2(testCB *UpdateProgMeter);
int fnunmdll_0(void);
void fnunmdll_1(int *x);//testCB *UpdateProgMeter);
__gc class C1
{
public:
static void handleCB()
{
return;
}
};
int _tmain()
{
int k = 9;
//always works (as both C/C++)
fnunmdll_0();
//always works (as both C/C++)
fnunmdll_1(&k);
testCB *pCB = new testCB(0, &C1::handleCB);
//if this is a C++ function expecting a function pointer, the
aforementioned error occurs. If this is an extern "C" function, all is
ok!
fnunmdll_2(pCB);
return 0;
}
As crazy as it sounds, I''m beginning to think this is not possible to do
with native C++ functions.
Thanks in advance, George
这与代理无关，这是一个C ++名称修改问题，
您的DllImport函数（fnunmdll_2）必须使用C链接导出，或者
适当.DEF文件。
extern" C"
{
....
}
威利。
" glutz7878" < GL ******* @ discussions.microsoft.com>在消息中写道
news：42 ********************************** @ microsof t.com ...
This has nothing to do with delegates, this is a C++ name mangling issue,
your DllImport functions (fnunmdll_2) must use C linkage exports, or an
appropriate .DEF file.
extern "C"
{
....
}
Willy.
"glutz7878" <gl*******@discussions.microsoft.com> wrote in message
news:42**********************************@microsof t.com...
我将__delegate ptrs传递给DLL中的本机C函数没有问题，但是当试图将__delegate ptr传递给本机C ++
函数时在DLL中我得到以下运行时异常：
类型''System.EntryPointNotFoundException''的未处理异常。
如果入口点不是b / c这会令人困惑发现，我认为在链接过程中我会得到一个未解决的符号错误。此外，我可以成功地将void，int *和函数指针等传递给C ++ DLL
函数，但是当尝试传递__delegate
指针时，此错误仍然存在，该指针用于回调管理C ++函数。
这是相关的代码片段 - DLL代码只包含这里调用函数的存根：
#include" stdafx。 h"
#using< mscorlib.dll>
使用命名空间系统;
使用命名空间System :: Runtime :: InteropServices;
__delegate void testCB（）;
[DllImport（" unmdll.dll"）]
void fnunmdll_2（testCB * UpdateProgMeter）;
int fnunmdll_0（void）;
void fnunmdll_1（int * x）; // testCB * UpdateProgMeter）;
__gc class C1
{
public：
static void handleCB（）
{
返回;
}
};
int _tmain（）
{
int k = 9;
//总是有效（和C / C ++一样）
fnunmdll_0（）;
//总是有效（和C / C ++一样）
fnunmdll_1（& k）;
testCB * pCB = new testCB（0，& C1 :: handleCB）;
//如果这是一个期望函数指针的C ++函数，则会发生上述错误。如果这是一个外部的C。功能，一切都好了！
fnunmdll_2（pCB）;
返回0;
}
听起来很疯狂，我我开始认为用原生C ++函数做这个是不可能的。
提前谢谢，George
I have no trouble passing __delegate ptrs to native C functions in DLLs,
however when attempting to pass the __delegate ptr to a native C++
function
in a DLL I get the following runtime exception: An unhandled exception of
type ''System.EntryPointNotFoundException''.
This is confusing b/c if the entry point was not found, I would think I''d
get an unresolved symbol error during linking. Furthermore, I can
successfully pass void, int *, and function pointers, etc to C++ DLL
functions, but this error persists when attempting to pass a __delegate
pointer, which is used for callbacks to managed C++ functions.
Here is the relevant code snippet - the DLL code simply contains stubs of
the functions called here:
#include "stdafx.h"
#using <mscorlib.dll>
using namespace System;
using namespace System::Runtime::InteropServices;
__delegate void testCB();
[DllImport("unmdll.dll")]
void fnunmdll_2(testCB *UpdateProgMeter);
int fnunmdll_0(void);
void fnunmdll_1(int *x);//testCB *UpdateProgMeter);
__gc class C1
{
public:
static void handleCB()
{
return;
}
};
int _tmain()
{
int k = 9;
//always works (as both C/C++)
fnunmdll_0();
//always works (as both C/C++)
fnunmdll_1(&k);
testCB *pCB = new testCB(0, &C1::handleCB);
//if this is a C++ function expecting a function pointer, the
aforementioned error occurs. If this is an extern "C" function, all is
ok!
fnunmdll_2(pCB);
return 0;
}
As crazy as it sounds, I''m beginning to think this is not possible to do
with native C++ functions.
Thanks in advance, George
感谢帖子，但是你知道为什么传递
void或int *，甚至函数指针都没有问题？难道他们也没有名字错误
问题？奇怪的是，唯一失败的是传递
__delegates。
再次感谢，George
Thanks for the post but do you know why there are no problems when passing
void or int *, even function pointers? Wouldn''t they also have name mangling
issues? It seems strange that the only thing that fails is passing
__delegates.
Thanks again, George
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