轻松学习C#：百度行驶证C++离线SDK接入详解
DotNet NB
共 22165字，需浏览 45分钟
·
2024-04-21 08:00
效果
先看最终效果
SDK
拿到完整包如图，687M
解压后看看内容
发现有个readme.txt，那就先看看内容
1:用vs2015打开sln工程，最好用vs2015 comunity版本，可微软官网下载。
2:sdk的doc目录有pdf接口文档。
3:工程总入口main.cpp、请参考示例实现您的功能。
4:sdk支持windows x7、10等主流平台的64位模式。
5:工程不支持debug模式，请切换到Release x64。
做个听劝的人，不当犟拐拐，用VS2015打开工程看看
直接运行看看
LICENSE err！！！找销售要个测试的license先试试。
加入license以后，再运行试试。
封装DLL
下面开始动手封装一个DLL给C#调用
新建一个项目，起名DLSharp
附加包含目录
附加库目录
附加依赖项
opencv_world410.lib
ocr_vehiclecard_front.lib
ocr_vehiclecard_back.lib定义头文件
#pragma once
#include "targetver.h"
#define WIN32_LEAN_AND_MEAN // 从 Windows 头中排除极少使用的资料
// Windows 头文件:
#include <windows.h>
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
// 初始化正页SDK授权
extern "C" _declspec(dllexport) int __stdcall dl_front_init_license(char* key, char* licenseFile, bool is_remote);
// 创建正页SDK实例
extern "C" _declspec(dllexport) void* __stdcall dl_front_create();
//正页SDK实例初始化
extern "C" _declspec(dllexport) int __stdcall dl_front_init(void* engine, char* ini_path);
//正页SDK识别
extern "C" _declspec(dllexport) int __stdcall dl_front_ocr(void* engine, char* image_path, char* ocr_result1, char* ocr_result2);
//正页SDK识别2
extern "C" _declspec(dllexport) int __stdcall dl_front_ocr2(void* engine, Mat* image, char* ocr_result1, char* ocr_result2);
//正页SDK释放
extern "C" _declspec(dllexport) void __stdcall dl_front_destroy(void* engine);
代码实现
#define _CRT_SECURE_NO_WARNINGS
#include "stdafx.h"
// TODO: 在 STDAFX.H 中引用任何所需的附加头文件，
//而不是在此文件中引用
#include <memory>
#include "dirent.h"
#include <sys/stat.h>
#include <fstream>
#include <string>
#include <fstream>
#include <io.h>
#include <codecvt>
#include <wchar.h>
#include "front/include/iocrgve_engine.h"
#include "front/include/response.h"
#include "front/include/DLL_API.h"
#include "back/include/iocrgve_engine.h"
#include "back/include/response.h"
#include "back/include/DLL_API.h"
// 初始化正页SDK授权
int __stdcall dl_front_init_license(char* key, char* licenseFile, bool is_remote)
{
vis_vehiclecard_front::IOcrgveEngine::set_log(vis_vehiclecard_front::OFF_LOG, "", false);
std::cout << "vis_vehiclecard_front key:" << key << std::endl;
std::cout << "vis_vehiclecard_front licenseFile:" << licenseFile << std::endl;
return (int)vis_vehiclecard_front::IOcrgveEngine::init_license(key, licenseFile, is_remote);
}
// 创建正页SDK实例
void* __stdcall dl_front_create() {
vis_vehiclecard_front::IOcrgveEngine* engine = vis_vehiclecard_front::IOcrgveEngine::create();
return engine;
}
//实例初始化
int __stdcall dl_front_init(void* engine, char* ini_path) {
vis_vehiclecard_front::IOcrgveEngine* _engine = (vis_vehiclecard_front::IOcrgveEngine*)engine;
return (int)_engine->init(ini_path);
}
//识别
int __stdcall dl_front_ocr(void* engine, char* image_path, char* ocr_result1, char* ocr_result2) {
int res = 0;
vis_vehiclecard_front::IOcrgveEngine* _engine = (vis_vehiclecard_front::IOcrgveEngine*)engine;
std::cout << "image_path:" << image_path << std::endl;
Mat input_mat;
try {
input_mat = imread(image_path, IMREAD_COLOR);
}
catch (...) {
std::cout << "imread error" << std::endl;
return -1;
}
return dl_front_ocr2(_engine, &input_mat, ocr_result1, ocr_result2);
}
//识别2
int __stdcall dl_front_ocr2(void* engine, Mat* image, char* ocr_result1, char* ocr_result2)
{
int res = 0;
vis_vehiclecard_front::IOcrgveEngine* _engine = (vis_vehiclecard_front::IOcrgveEngine*)engine;
vis_vehiclecard_front::ImageFrame input_frame;
input_frame._width = (*image).cols;
input_frame._height = (*image).rows;
input_frame._data = (uint8_t*)(*image).data;
input_frame._fmt = vis_vehiclecard_front::IMAGE_PIX_FMT_BGR;
std::vector<vis_vehiclecard_front::ImageFrame> frames;
frames.push_back(input_frame);
std::vector<vis_vehiclecard_front::general_vertical_kv_ret> ocrgvesdk_response;
clock_t start, finish;
double duration;
start = clock();
res = _engine->process_ocrgvesdk(frames, vis_vehiclecard_front::IMAGE_ORIENTATION_UP, ocrgvesdk_response);
finish = clock();
duration = (double)(finish - start) / CLOCKS_PER_SEC;
printf("img_process time: %2.1f ms\r\n", duration * 1000);
if (res != vis_vehiclecard_front::SUCCESS) {
return res;
}
std::string res_str("");
std::string res_str2("");
auto final_result = ocrgvesdk_response[0];
int direction = 0;
for (auto it : final_result.kv_content)
{
res_str += "\"" + it.first + "\":";
res_str += "\"" + it.second[0].get_str() + "\"";
res_str += ",";
std::string str = ("{\"value\":\"") + it.second[0].get_str() + ("\",") +
"\"coordinator\":\"" + std::to_string(it.second[0].get_coord()[0]) + (" ") +
std::to_string(it.second[0].get_coord()[1]) + (" ") +
std::to_string(it.second[0].get_coord()[2]) + (" ") +
std::to_string(it.second[0].get_coord()[3]) + (" ") +
std::to_string(it.second[0].get_coord()[4]) + (" ") +
std::to_string(it.second[0].get_coord()[5]) + (" ") +
std::to_string(it.second[0].get_coord()[6]) + (" ") +
std::to_string(it.second[0].get_coord()[7]) + ("\"") +
+",\"score\":\"" + std::to_string(it.second[0].get_det_score()) + "\"}";
res_str2 = res_str2 + str.c_str();
res_str2 += ",";
}
std::string res_header =
"\"logid\":\"\",\"err_no\":0,\"err_msg\":\"SUCCESS\",\"querysign\":\"4188554259,1723708640\",\"image_dir\":\"" + std::to_string(direction) + "\",\"ret\":{";
if (res_str.empty()) {
return -1;
}
res_str.pop_back();
res_str = "{" + res_header + res_str + "}}";
const char *cstr = res_str.c_str();
strcpy(ocr_result1, cstr);
res_str2.erase(res_str2.length() - 1);
res_str2 = "[" + res_str2 + "]";
const char *cstr2 = res_str2.c_str();
strcpy(ocr_result2, cstr2);
return res;
}
//释放
void __stdcall dl_front_destroy(void* engine) {
vis_vehiclecard_front::IOcrgveEngine* _engine = (vis_vehiclecard_front::IOcrgveEngine*)engine;
_engine->uninit();
vis_vehiclecard_front::IOcrgveEngine::destroy(&_engine);
}
编译生成
C#调用测试
新建项目
绘制界面、添加依赖等
拷贝生成的封装的DLSharp.dll及相关依赖到bin\x64\Release下
完整测试代码如下，测试效果见文章开头
using Newtonsoft.Json;
using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
namespace FormTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
const string DllName = "DLSharp.dll";
//行驶证正页
[DllImport(DllName, EntryPoint = "dl_front_init_license", CallingConvention = CallingConvention.Cdecl)]
internal extern static int dl_front_init_license(string key, string licenseFile, bool is_remote);
[DllImport(DllName, EntryPoint = "dl_front_create", CallingConvention = CallingConvention.Cdecl)]
internal extern static IntPtr dl_front_create();
[DllImport(DllName, EntryPoint = "dl_front_init", CallingConvention = CallingConvention.Cdecl)]
internal extern static int dl_front_init(IntPtr engine, string ini_path);
[DllImport(DllName, EntryPoint = "dl_front_ocr", CallingConvention = CallingConvention.Cdecl)]
internal extern static int dl_front_ocr(IntPtr engine, string image_path, StringBuilder ocr_result1, StringBuilder ocr_result2);
[DllImport(DllName, EntryPoint = "dl_front_ocr2", CallingConvention = CallingConvention.Cdecl)]
internal extern static int dl_front_ocr2(IntPtr engine, IntPtr image, StringBuilder ocr_result1, StringBuilder ocr_result2);
[DllImport(DllName, EntryPoint = "dl_front_destroy", CallingConvention = CallingConvention.Cdecl)]
internal extern static void dl_front_destroy(IntPtr engine);
IntPtr front_engine;
string image_path = "";
private void Form1_Load(object sender, EventArgs e)
{
string key = "AISEE_xingshizheng_win_0530_3_3";
string licenseFile = Application.StartupPath + "\\license\\license.ini";
int res = -1;
string ini_path = "";
res = dl_front_init_license(key, licenseFile, false);
Console.WriteLine(res.ToString());
front_engine = dl_front_create();
ini_path = Application.StartupPath + "\\resource\\vehiclecard_front_resource";
res = dl_front_init(front_engine, ini_path);
Console.WriteLine(res.ToString());
image_path = Application.StartupPath + "\\front_images\\2.jpg";
pictureBox1.Image = new Bitmap(image_path);
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
dl_front_destroy(front_engine);
}
private void button1_Click(object sender, EventArgs e)
{
if (image_path == "")
{
return;
}
textBox1.Text = "";
Application.DoEvents();
StringBuilder ocr_result1 = new StringBuilder(1024);
StringBuilder ocr_result2 = new StringBuilder(2048);
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
int res = dl_front_ocr(front_engine, image_path, ocr_result1, ocr_result2);
//int res = dl_front_ocr2(front_engine, image.CvPtr, ocr_result1, ocr_result2);
double totalTime = stopwatch.Elapsed.TotalSeconds;
stopwatch.Stop();
textBox1.Text += $"耗时: {totalTime:F2}s";
textBox1.Text += "\r\n-------------------\r\n";
Mat image = new Mat(image_path);
if (res == 0)
{
Object jsonObject = JsonConvert.DeserializeObject(ocr_result1.ToString());
textBox1.Text += JsonConvert.SerializeObject(jsonObject, Newtonsoft.Json.Formatting.Indented);
textBox1.Text += "\r\n-------------------\r\n";
Object jsonObject2 = JsonConvert.DeserializeObject(ocr_result2.ToString());
textBox1.Text += JsonConvert.SerializeObject(jsonObject2, Newtonsoft.Json.Formatting.Indented);
List<OcrRes2> lt = JsonConvert.DeserializeObject<List<OcrRes2>>(ocr_result2.ToString());
foreach (OcrRes2 item in lt)
{
string[] pts = item.coordinator.Split(' ');
//多边形的顶点
OpenCvSharp.Point[] points = new OpenCvSharp.Point[]
{
new OpenCvSharp.Point(Convert.ToDouble( pts[0]), Convert.ToDouble( pts[1])),
new OpenCvSharp.Point(Convert.ToDouble( pts[2]), Convert.ToDouble( pts[3])),
new OpenCvSharp.Point(Convert.ToDouble( pts[4]), Convert.ToDouble( pts[5])),
new OpenCvSharp.Point(Convert.ToDouble( pts[6]), Convert.ToDouble( pts[7])),
};
// 绘制多边形
Cv2.Polylines(image, new OpenCvSharp.Point[][] { points }, isClosed: true, color: new Scalar(0, 255, 0), thickness: 3);
}
if (pictureBox1.Image != null)
{
pictureBox1.Image.Dispose();
pictureBox1.Image = null;
}
pictureBox1.Image = new Bitmap(image.ToMemoryStream());
image.Dispose();
}
else
{
textBox1.Text = "识别失败";
}
}
}
public class OcrRes2
{
public OcrRes2(string value, string coordinator, double score)
{
this.value = value;
this.coordinator = coordinator;
this.score = score;
}
public string value { set; get; }
public string coordinator { set; get; }
public double score { set; get; }
}
}
其他
至此，完成基本的封装调用，行驶证副页封装、调用同理可得。
看完啦，快去动手试试吧！
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