如何从 C# 调用 C++ 函数
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How can I call to a C++ function from C#
提问by Piraba
I have C++ code. That code contains Windows mobile GPS enable/disable functionality. I want to call that method from C# code, that means when the user clicks on a button, C# code should call into C++ code.
我有 C++ 代码。该代码包含 Windows 移动 GPS 启用/禁用功能。我想从 C# 代码中调用该方法，这意味着当用户单击按钮时，C# 代码应该调用 C++ 代码。
This is the C++ code for enabling the GPS functionality:
这是用于启用 GPS 功能的 C++ 代码：
#include "cppdll.h"
void Adder::add()
{
// TODO: Add your control notification handler code here
HANDLE hDrv = CreateFile(TEXT("FNC1:"), GENERIC_READ | GENERIC_WRITE,
0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (0 == DeviceIoControl(hDrv, IOCTL_WID_GPS_ON, NULL, 0, NULL, 0, NULL, NULL))
{
RETAILMSG(1, (L"IOCTL_WID_RFID_ON Failed !! \r\n")); return;
}
CloseHandle(hDrv);
return (x+y);
}
And this is the header file cppdll.h:
这是头文件cppdll.h：
class __declspec(dllexport) Adder
{
public:
Adder(){;};
~Adder(){;};
void add();
};
How can I call that function using C#?
如何使用 C# 调用该函数？
Please, can anybody help me out with this issue?
请问有人能帮我解决这个问题吗？
采纳答案by Gleno
I'll give you an example.
我给你举个例子。
You should declare your C++ functions for export like so (assuming recent MSVC compiler):
您应该像这样声明用于导出的 C++ 函数（假设最近的 MSVC 编译器）：
extern "C" //No name mangling
__declspec(dllexport) //Tells the compiler to export the function
int //Function return type
__cdecl //Specifies calling convention, cdelc is default,
//so this can be omitted
test(int number){
return number + 1;
}
And compile your C++ project as a dll library. Set your project target extension to .dll, and Configuration Type to Dynamic Library (.dll).
并将您的 C++ 项目编译为 dll 库。将项目目标扩展名设置为 .dll，将配置类型设置为动态库 (.dll)。
Then, in C# declare:
然后，在 C# 中声明：
public static class NativeTest
{
private const string DllFilePath = @"c:\pathto\mydllfile.dll";
[DllImport(DllFilePath , CallingConvention = CallingConvention.Cdecl)]
private extern static int test(int number);
public static int Test(int number)
{
return test(number);
}
}
Then you can call your C++ test function, as you would expect. Note that it may get a little tricky once you want to pass strings, arrays, pointers, etc. See for example thisSO question.
然后，您可以按预期调用 C++ 测试函数。请注意，一旦您想传递字符串、数组、指针等，它可能会变得有点棘手。请参阅例如这个SO 问题。
