C#调用C++ Dll

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如果想在C#中调用C++的dll，按照以下步骤操作即可：

（1）在C#程序中加入导入语句，如下：

[DllImport("CVocrModelSDKClr.dll", EntryPoint = "Init", CallingConvention = CallingConvention.Cdecl)]
public static extern int Init(string libPath, int imageWidth, int imageHeight);

（2）将dll拷贝到C#的exe目录；

以下是示例代码：

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Runtime.InteropServices;

namespace CSharpTestSDK
{
unsafe public struct CSubtitleBlockInfo
{
public int fontIndex;
public int subtitleRect_L;
public int subtitleRect_T;
public int subtitleRect_R;
public int subtitleRect_B;
public int foreColor_R;
public int foreColor_G;
public int foreColor_B;
public int backgroundColor_R;
public int backgroundColor_G;
public int backgroundColor_B;
public int characterHeight;
public int characterWidth;
};
unsafe public struct CSubtitleBlockInfoSet
{
public CSubtitleBlockInfo* subtitleBlockInfo;
public int count;
public int capacity;
};
unsafe public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

[DllImport("CVocrModelSDKClr.dll", EntryPoint = "Init", CallingConvention = CallingConvention.Cdecl)]
public static extern int Init(string libPath, int imageWidth, int imageHeight);

[DllImport("CVocrModelSDKClr.dll", EntryPoint = "GetSubtitleInfo", CallingConvention = CallingConvention.Cdecl)]
public static extern int GetSubtitleInfo(int[] aImageData, int aImageSize, ref CSubtitleBlockInfoSet aSubtitleBlockInfoSet);

[DllImport("CVocrModelSDKClr.dll", EntryPoint = "ReleaseResource", CallingConvention = CallingConvention.Cdecl)]
public static extern int ReleaseResource();

private void button1_Click(object sender, EventArgs e)
{
int ret;
string rootPath;
int imageWidth = 0, imageHeight = 0, topRowNum = 0;
Image img = Image.FromFile("f:/21.jpg");
Bitmap btp = (Bitmap)img;
imageWidth = img.Width;
imageHeight = img.Height / 3;
topRowNum = img.Height - imageHeight;
int[] imageData = new int[imageWidth*imageHeight*3];
CSubtitleBlockInfoSet subtitleBlockInfoSet;
subtitleBlockInfoSet.capacity = 0;
subtitleBlockInfoSet.count = 0;
subtitleBlockInfoSet.subtitleBlockInfo = null;
for (int i = 0; i < imageHeight; i++)
{
for (int j = 0; j < imageWidth; j++ )
{
imageData[i * imageWidth * 3 + 3 * j] = btp.GetPixel(j, i + topRowNum).R;
imageData[i * imageWidth * 3 + 3 * j + 1] = btp.GetPixel(j, i + topRowNum).G;
imageData[i * imageWidth * 3 + 3 * j + 2] = btp.GetPixel(j, i + topRowNum).B;
}
}

//
rootPath = System.Environment.CurrentDirectory;
ret = Init(rootPath, imageWidth, imageHeight);
if (ret == 0)
{
MessageBox.Show("内部错误");
}
ret = GetSubtitleInfo(imageData, imageWidth*imageHeight, ref subtitleBlockInfoSet);
if (ret == 0)
{
MessageBox.Show("内部错误");
}
for (int i = 0; i < subtitleBlockInfoSet.count; i++ )
{
subtitleBlockInfoSet.subtitleBlockInfo[i].subtitleRect_T += imageHeight;
subtitleBlockInfoSet.subtitleBlockInfo[i].subtitleRect_B += imageHeight;
}
//ReleaseResource();
}
}
}

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