
将vector/array从非托管c++传递到c#
目录总结示例1、将一维数组从非托管c++传递到c#2、将二维数组从非托管c++传递到c#3、将vector从非托管c++传递到c#4、Marshalling arrays between C++ and C#5、Passing a dynamic array from unmanaged C++ to C#(C++动态数组传递给C#)6、Passing a vector of structs fr
目录
4、Marshalling arrays between C++ and C#
5、Passing a dynamic array from unmanaged C++ to C#(C++动态数组传递给C#)
6、Passing a vector of structs from unmanaged C++ to C#(C++自定义结构体传递给C#)
7、Passing a vector of strings from unmanaged C++ to C#(C++字符串Vector传递给C#)
8、Passing a vector of custom objects from unmanaged C++ to C#(C++自定义类型vector传递给C#)
9、C++/CLI for bridging C++ and C#
10、Passing a fixed-size array from unmanaged C++ to C#(C++固定大小数组传递给C#)
机翻,有些地方不翻译,更好理解
总结
将vector/array从非托管c++传递到c#涉及到跨托管/非托管边界的数据封送。在c#中有几种方法可以做到这一点,具体取决于具体的场景:
使用P/Invoke:如果c++代码作为DLL公开,您可以使用P/Invoke从c#调用它。您需要在c#中定义c++函数签名,并使用MarshalAs属性来指定数据应该如何封送。例如,使用P/Invoke将一个整数数组从c++传递到c#:
[DllImport("mydll.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern void MyFunction([Out] int[] data, int size);
// ...
int[] data = new int[10];
MyFunction(data, data.Length);
在这个例子中,c++函数签名应该是extern "C" __declspec(dllexport) void __stdcall MyFunction(int* data, int size)。[Out]属性告诉运行时为数组分配内存,并在调用后将数据复制回托管内存。
1、使用COM:如果c++代码作为COM对象公开,你可以使用COM互操作从c#调用它。您需要在c#项目中添加对COM对象的引用,并像调用任何其他。net对象一样调用其方法。
2、使用c++ /CLI:如果你正在编写c++代码和c#代码,你可以使用c++ /CLI来连接这两种语言。c++ /CLI是一种语言,它允许您编写可以调用非托管代码的托管代码,反之亦然。您可以定义一个c++ /CLI包装器类,将c++功能作为托管类公开,并从c#调用这个类。
3、使用内存映射文件:如果数据太大,无法在两种语言之间直接传递,则可以使用内存映射文件在两个进程之间共享数据。c++代码可以将数据写入内存映射文件,c#代码可以从同一文件中读取数据。这种方法比其他方法需要更多的设置和管理,但是在处理大量数据时非常有用。
示例
1、将一维数组从非托管c++传递到c#
描述:学习如何使用P/Invoke将一维数组从非托管c++传递到c#。
// Code Example 1 (C++)
extern "C" __declspec(dllexport) void PassArrayToCSharp(int* array, int size)
{
// Call the C# method using P/Invoke
}
// Code Example 1 (C#)
[DllImport("YourCppLibrary.dll")]
public static extern void PassArrayToCSharp(int[] array, int size);
// Usage
int[] arrayToSend = { 1, 2, 3, 4, 5 };
int size = arrayToSend.Length;
PassArrayToCSharp(arrayToSend, size);
2、将二维数组从非托管c++传递到c#
了解如何使用P/Invoke将二维数组从非托管c++传递到c#。
// Code Example 2 (C++)
extern "C" __declspec(dllexport) void Pass2DArrayToCSharp(int** array, int rows, int cols)
{
// Call the C# method using P/Invoke
}
// Code Example 2 (C#)
[DllImport("YourCppLibrary.dll")]
public static extern void Pass2DArrayToCSharp(int[][] array, int rows, int cols);
// Usage
int[][] arrayToSend = { new int[] { 1, 2, 3 }, new int[] { 4, 5, 6 } };
int rows = arrayToSend.Length;
int cols = arrayToSend[0].Length;
Pass2DArrayToCSharp(arrayToSend, rows, cols);
3、将vector从非托管c++传递到c#
探索如何使用P/Invoke将c++向量从非托管代码传递到c#。
// Code Example 3 (C++)
extern "C" __declspec(dllexport) void PassVectorToCSharp(std::vector<int>* vec)
{
// Call the C# method using P/Invoke
}
// Code Example 3 (C#)
[DllImport("YourCppLibrary.dll")]
public static extern void PassVectorToCSharp(IntPtr vector);
// Usage
List<int> listToSend = new List<int> { 1, 2, 3, 4, 5 };
IntPtr vectorPtr = Marshal.UnsafeAddrOfPinnedArrayElement(listToSend.ToArray(), 0);
PassVectorToCSharp(vectorPtr);
4、Marshalling arrays between C++ and C#
Learn the basics of marshalling arrays between C++ and C# for efficient data transfer.
// Code Example 4 (C++)
extern "C" __declspec(dllexport) void MarshalArraysToCSharp(int* array, int size)
{
// Call the C# method using P/Invoke
}
// Code Example 4 (C#)
[DllImport("YourCppLibrary.dll")]
public static extern void MarshalArraysToCSharp(int[] array, int size);
// Usage
int[] arrayToSend = { 1, 2, 3, 4, 5 };
int size = arrayToSend.Length;
MarshalArraysToCSharp(arrayToSend, size);
5、Passing a dynamic array from unmanaged C++ to C#(C++动态数组传递给C#)
Learn how to pass a dynamically allocated array from unmanaged C++ to C# using P/Invoke.
// Code Example 5 (C++)
extern "C" __declspec(dllexport) void PassDynamicArrayToCSharp(int** array, int size)
{
// Call the C# method using P/Invoke
}
// Code Example 5 (C#)
[DllImport("YourCppLibrary.dll")]
public static extern void PassDynamicArrayToCSharp(IntPtr array, int size);
// Usage
int[] arrayToSend = { 1, 2, 3, 4, 5 };
IntPtr arrayPtr = Marshal.AllocHGlobal(arrayToSend.Length * sizeof(int));
Marshal.Copy(arrayToSend, 0, arrayPtr, arrayToSend.Length);
PassDynamicArrayToCSharp(arrayPtr, arrayToSend.Length);
Marshal.FreeHGlobal(arrayPtr);
6、Passing a vector of structs from unmanaged C++ to C#(C++自定义结构体传递给C#)
Explore how to pass a C++ vector of structs to C# using P/Invoke.
// Code Example 6 (C++)
struct MyStruct
{
int field1;
float field2;
};
extern "C" __declspec(dllexport) void PassStructVectorToCSharp(std::vector<MyStruct>* vec)
{
// Call the C# method using P/Invoke
}
// Code Example 6 (C#)
[StructLayout(LayoutKind.Sequential)]
public struct MyStruct
{
public int field1;
public float field2;
}
[DllImport("YourCppLibrary.dll")]
public static extern void PassStructVectorToCSharp(IntPtr vector);
// Usage
List<MyStruct> listToSend = new List<MyStruct> { new MyStruct { field1 = 1, field2 = 2.0f } };
IntPtr vectorPtr = Marshal.UnsafeAddrOfPinnedArrayElement(listToSend.ToArray(), 0);
PassStructVectorToCSharp(vectorPtr);
7、Passing a vector of strings from unmanaged C++ to C#(C++字符串Vector传递给C#)
Learn how to pass a C++ vector of strings to C# using P/Invoke
// Code Example 7 (C++)
extern "C" __declspec(dllexport) void PassStringVectorToCSharp(std::vector<std::string>* vec)
{
// Call the C# method using P/Invoke
}
// Code Example 7 (C#)
[DllImport("YourCppLibrary.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
public static extern void PassStringVectorToCSharp(IntPtr vector);
// Usage
List<string> listToSend = new List<string> { "One", "Two", "Three" };
IntPtr vectorPtr = Marshal.UnsafeAddrOfPinnedArrayElement(listToSend.ToArray(), 0);
PassStringVectorToCSharp(vectorPtr);
8、Passing a vector of custom objects from unmanaged C++ to C#(C++自定义类型vector传递给C#)
Understand how to pass a C++ vector of custom objects to C# using P/Invoke.
// Code Example 8 (C++)
class CustomClass
{
public:
int id;
float value;
};
extern "C" __declspec(dllexport) void PassCustomObjectVectorToCSharp(std::vector<CustomClass>* vec)
{
// Call the C# method using P/Invoke
}
// Code Example 8 (C#)
[StructLayout(LayoutKind.Sequential)]
public class CustomClass
{
public int id;
public float value;
}
[DllImport("YourCppLibrary.dll")]
public static extern void PassCustomObjectVectorToCSharp(IntPtr vector);
// Usage
List<CustomClass> listToSend = new List<CustomClass> { new CustomClass { id = 1, value = 2.0f } };
IntPtr vectorPtr = Marshal.UnsafeAddrOfPinnedArrayElement(listToSend.ToArray(), 0);
PassCustomObjectVectorToCSharp(vectorPtr);
9、C++/CLI for bridging C++ and C#
Explore using C++/CLI to create a bridge between unmanaged C++ and C#.
// Code Example 9 (C++/CLI)
#include <vector>
public ref class CppCliBridge
{
public:
static void PassVectorToCSharp(std::vector<int>* vec)
{
// Call the C# method
}
};
// Code Example 9 (C#)
CppCliBridge.PassVectorToCSharp(vectorPtr);
10、Passing a fixed-size array from unmanaged C++ to C#(C++固定大小数组传递给C#)
Learn how to pass a fixed-size array from unmanaged C++ to C# using P/Invoke.
// Code Example 10 (C++)
extern "C" __declspec(dllexport) void PassFixedSizeArrayToCSharp(int array[5])
{
// Call the C# method using P/Invoke
}
// Code Example 10 (C#)
[DllImport("YourCppLibrary.dll")]
public static extern void PassFixedSizeArrayToCSharp(int[] array);
// Usage
int[] arrayToSend = { 1, 2, 3, 4, 5 };
PassFixedSizeArrayToCSharp(arrayToSend);
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