在做项目时，之前使用的是某康的智能读码器，综合考虑成本，可通过相机拍照来读取图片的二维码，我这边用Halcon来实现。

Halcon代码如下：

*创建模型
create_data_code_2d_model('Data Matrix ECC 200', [], [], DataCodeHandle)*设置条码极性
set_data_code_2d_param(DataCodeHandle, 'polarity', 'any')*解码时长的设置，超时直接将条码丢弃
set_data_code_2d_param(DataCodeHandle, 'timeout', 200)*开始二维码识别
read_image (Image, 'C:/Users/Administrator/Desktop/AirPods/Image_20220815110012088.bmp')*开始计时
count_seconds(Seconds)*解析二维码
find_data_code_2d(Image, SymbolXLDs, DataCodeHandle, [], [], ResultHandles, DecodedDataStrings)*结束计时
count_seconds(Seconds1)*累计耗时
time:=Seconds1-Seconds*判断解码结果是否有结果
tuple_length(DecodedDataStrings, Length)
if (Length>0)*//获取区域concat_obj(SymbolXLDs, SymbolXLDs, ObjectsConcat)dev_clear_window ()dev_display (Image)*绘制区域dev_display(ObjectsConcat)*显示二维码dev_disp_text(DecodedDataStrings, 'window', 'top', 'left', 'black', [], [])
endif

 显示效果：

可以看出几十毫秒可以解读条码，如要识别其他类型的二维码，可更改create_data_code_2d_model算子的参数。

那么如何将Halcon代码转化为C#可调用的方法？

1 先将Halcon代码导出，得到cs文件

 2 在VS中添加Halcon的引用，并将方法调整，我这里是结合OpencvSHarp

调整后的方法：

/// <summary>///  识别 Data Matrix ECC 200/// </summary>/// <param name="ho_InputImage">图片对象</param>/// <returns></returns>private string ReadDataMatrix(HObject ho_InputImage){string result = string.Empty;// Local iconic variablesHObject ho_SymbolXLDs;HObject ho_ObjectsConcat = null;// Local control variablesHTuple hv_DataCodeHandle = new HTuple(), hv_Seconds = new HTuple();HTuple hv_ResultHandles = new HTuple(), hv_DecodedDataStrings = new HTuple();HTuple hv_Seconds1 = new HTuple(), hv_time = new HTuple();HTuple hv_Length = new HTuple();// Initialize local and output iconic variablesHOperatorSet.GenEmptyObj(out ho_SymbolXLDs);HOperatorSet.GenEmptyObj(out ho_ObjectsConcat);try{//创建模型hv_DataCodeHandle.Dispose();//QR CodeHOperatorSet.CreateDataCode2dModel("QR Code", new HTuple(), new HTuple(), out hv_DataCodeHandle);//HOperatorSet.CreateDataCode2dModel("QR Code", new HTuple(), new HTuple(), out hv_DataCodeHandle);//设置条码极性HOperatorSet.SetDataCode2dParam(hv_DataCodeHandle, "polarity", "any");//解码时长的设置，超时直接将条码丢弃HOperatorSet.SetDataCode2dParam(hv_DataCodeHandle, "timeout", 300);//**********开始二维码识别****************//开始计时hv_Seconds.Dispose();HOperatorSet.CountSeconds(out hv_Seconds);//解析二维码ho_SymbolXLDs.Dispose(); hv_ResultHandles.Dispose(); hv_DecodedDataStrings.Dispose();HOperatorSet.FindDataCode2d(ho_InputImage, out ho_SymbolXLDs, hv_DataCodeHandle,new HTuple(), new HTuple(), out hv_ResultHandles, out hv_DecodedDataStrings);//结束计时hv_Seconds1.Dispose();HOperatorSet.CountSeconds(out hv_Seconds1);//累计耗时hv_time.Dispose();using (HDevDisposeHelper dh = new HDevDisposeHelper()){hv_time = hv_Seconds1 - hv_Seconds;}//MessageBox.Show(hv_time);//判断解码结果是否有结果hv_Length.Dispose();HOperatorSet.TupleLength(hv_DecodedDataStrings, out hv_Length);if ((int)(new HTuple(hv_Length.TupleGreater(0))) != 0){result = hv_DecodedDataStrings;}}catch (Exception ex){return result;}finally{ho_InputImage.Dispose();ho_SymbolXLDs.Dispose();ho_ObjectsConcat.Dispose();hv_DataCodeHandle.Dispose();hv_Seconds.Dispose();hv_ResultHandles.Dispose();hv_DecodedDataStrings.Dispose();hv_Seconds1.Dispose();hv_time.Dispose();hv_Length.Dispose();}return result;}

此处还涉及Mat对象转换为HObject

/// <summary>///  Mat转换为HObject/// </summary>/// <param name="mat"></param>/// <returns></returns>public HImage Mat2HObject(Mat mat){HImage hImage = new HImage();try{if (mat.Type() == MatType.CV_8UC1){hImage.GenImage1("byte", mat.Width, mat.Height, mat.Data);}else{hImage.GenImageInterleaved(mat.Data, "rgb", mat.Width, mat.Height, 0, "byte", mat.Width, mat.Height, 0, 0, -1, 0);}}catch (Exception){}finally{mat.Dispose();}return hImage;}