C# 调用C++的dll，通过DllImport方式。
以下例子包含以下几种参数传递方式：
传递string、Int、Int数组、结构体、结构体数组。
比较懒，没写注释，呵呵，各位辛苦了。
C++ Dll 如下：
// dllmain.cpp : Defines the entry point for the DLL application.#include "stdafx.h"#include <stdio.h>#include <tchar.h>BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ){ switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: case DLL_THREAD_ATTACH: case DLL_THREAD_DETACH: case DLL_PROCESS_DETACH: break; } return TRUE;}struct PersonInfo{ int id; wchar_t name;};struct StudentInfo{ int id; wchar_t name[100];};int Add(int para1,int para2){ return para1+para2;};int TestStruct(struct PersonInfo* person){ person->id=10; return 0;};int TestStructArray(struct PersonInfo persons[5] ){ persons[0].id=11; persons[0].name = L'a'; persons[1].id=22; persons[1].name = L'b'; persons[2].id=33; persons[2].name = L'c'; persons[3].id=44; persons[3].name = L'd'; persons[4].id=55; persons[4].name = L'e'; return 0;};int TestStructArray2(struct StudentInfo students[3] ){ students[0].id=11; wcscpy(students[0].name,L"aaaaaaa"); TCHAR szMsg[200] = {0}; _stprintf_s(szMsg, 200, _T("size of PersonInfo2:%d"), sizeof(StudentInfo)); ::OutputDebugString(szMsg); students[1].id=22; wcscpy(students[1].name,L"bbbb"); students[2].id=33; wcscpy(students[2].name,L"ccc"); return 0;};int TestIntArr(int tt[5]){ tt[0]=0; tt[1]=1; tt[2]=2; tt[3]=3; tt[4]=4; return 0;}int TestString(LPTSTR buffer, DWORD size){ wcscpy_s(buffer,size,L"eststsetwet"); return 0;} |
C++ def文件如下：
LIBRARY "Win32Dll"EXPORTS Add TestStruct TestStructArray TestStructArray2 TestIntArr TestString |
C# 调用代码如下：
/// <summary>/// Interaction logic for Window1.xaml/// </summary>public partial class Window1 : Window{ public Window1() { InitializeComponent(); Loaded += new RoutedEventHandler(button1_Click); } private void button1_Click(object sender, RoutedEventArgs e) { int num1 = 0, num2 = 0; if (!string.IsNullOrEmpty(textBox1.Text) && !string.IsNullOrEmpty(textBox2.Text)) { num1 = Convert.ToInt32(textBox1.Text); num2 = Convert.ToInt32(textBox2.Text); int ret = DllTest.Add(Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text)); textBlock3.Text = ret.ToString(); } PersonInfo p = new PersonInfo(); DllTest.TestStruct(ref p); //int dd = p.id; int[] intArray = new int[5]; DllTest.TestIntArr(intArray); Debug.WriteLine(intArray); PersonInfo[] ps = new PersonInfo[5]; DllTest.TestStructArray(ps); int t = Marshal.SizeOf(new StudentInfo()); // var t = sizeof(PersonInfo2); StudentInfo[] ps2 = new StudentInfo[3]; DllTest.TestStructArray2(ps2); short[] name = ps2[0].name; string ret13 = new string(name.Where(o => o != 0).Select(o => (char)o).ToArray()); char[] chars = new char[100]; StringBuilder builder = new StringBuilder(256); DllTest.TestString(builder, 256); }}public class DllTest{ [DllImport("Win32Dll.dll", EntryPoint = "Add")] public static extern Int32 Add(int a, int b); [DllImport("Win32Dll.dll", EntryPoint = "TestStruct")] public static extern Int32 TestStruct(ref PersonInfo person); [DllImport("Win32Dll.dll", EntryPoint = "TestStructArray")] public static extern Int32 TestStructArray([In, Out] PersonInfo[] persons); [DllImport("Win32Dll.dll", EntryPoint = "TestStructArray2")] public static extern Int32 TestStructArray2([In, Out] StudentInfo[] students); [DllImport("Win32Dll.dll", EntryPoint = "TestIntArr")] public static extern Int32 TestIntArr([In, Out] int[] intArray); [DllImport("Win32Dll.dll", EntryPoint = "TestString")] public static extern Int32 TestString([MarshalAs(UnmanagedType.LPTStr)]StringBuilder buffer, Int32 length);}[ComVisible(false), StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]public struct PersonInfo{ public int id; public char name;}[StructLayout(LayoutKind.Sequential)]public struct StudentInfo{ public int id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 100)] public short[] name;} |