C#调用C++编译Dll

C++编译DLL

这里以C++编译数组排序为例

extern "C" __declspec(dllexport) void array_sort(int* a, int len)
{
	for (int i = 0; i < len; i++)
	{
		for (int j = i + 1; j < len; j++)
		{
			if (a[i] > a[j])
			{
				int tmp = a[i];
				a[i] = a[j];
				a[j] = tmp;
			}
		}
	}
}

注意库的编译方式x86/x64/Debug/Release

C#调用DLL

using System.Runtime.InteropServices;
[DllImport("CppDll.dll", EntryPoint = "array_sort")]

static extern int array_sort(int[] a, int b);

private void button1_Click(object sender, EventArgs e)
{
    int[] array = new int[5];
    array[0] = 10;
    array[1] = 12;
    array[2] = 11;
    array[3] = 15;
    array[4] = 13;
    array_sort(array,5);

    for (int i = 0; i < 5; i++)
    {
        Console.Write(array[i].ToString()+",");
    }
}

同样需要注意库的编译方式x86/x64/Debug/Release，C#中默认为Any CPU

参考：

[1].https://www.codeguru.com/csharp/csharp/cs_data/article.php/c4217/Calling-Unmanaged-Code-Part-1--simple-DLLImport.htm