Halcon读取json文件实现示例
作者：忘·月
这篇文章主要为大家介绍了Halcon读取json文件实现示例，有需要的朋友可以借鉴参考下，希望能够有所帮助，祝大家多多进步，早日升职加薪
核心知识:
get_dict_tuple、get_dict_param的理解与应用
一、get_dict_ttuple算子
①定义
get_dict_tuple( DictHandle, Key ， Tuple)
DictHandle：字典句柄
key:键
tuple:根据Key在句柄下取内容，存放到tuple中
②功能:从字典中检索与键关联的元组
二、get_dict_param算子
①定义
get_dict_param( DictHandle, GenParamName, Key ,GenParamValue)
DictHandle：字典句柄
GenParamName:根据参数在字典中查询相关信息。当填写’keys’时，默认取所有元素
key：键。可以不填内容，直接写 []
GenParamValue:读取的内容存放
②功能:查询字典参数或有关字典的信息。
三、实践（直接上代码）
有些原理我也不是特别清楚，但通过实践几次之后，略有所感。所有，实践是检验真理的唯一标准，多动手。
************以下是我json文件内容***************
* {"path":"C:\\Users\\Administrator\\Desktop\\算子开发任务书\\000001.png",
* "outputs":{"object":[{"name":"sharp","polygon":{"x1":2613,"y1":418,"x2":2686,"y2":1218,"x3":2722,"y3":2054,"x4":2759,"y4":2372,"x5":2795,"y5":2445,"x6":2759,"y6":3136,"x7":2777,"y7":3136,"x8":2831,"y8":2881,"x9":2904,"y9":4263,"x10":3013,"y10":4263,"x11":3013,"y11":3900,"x12":3086,"y12":3881,"x13":3140,"y13":4263,"x14":3268,"y14":4263,"x15":3086,"y15":2972,"x16":3131,"y16":2900,"x17":3177,"y17":3100,"x18":3231,"y18":3109,"x19":3050,"y19":2154,"x20":3122,"y20":2172,"x21":3013,"y21":1072,"x22":2977,"y22":336,"x23":2868,"y23":309,"x24":2904,"y24":590,"x25":2777,"y25":572,"x26":2722,"y26":372}}]},
* "time_labeled":1582335060421,
* "labeled":true,
* "size":{"width":3798,"height":8748,"depth":3}}
*读取json文件,将内容放入字典中
read_dict('data.json',[],[],DictJson)
*取字典中所有关键字
get_dict_param(DictJson,'keys',[],ALLKeys)
*读取outputs下的内容
get_dict_tuple(DictJson,'outputs',outputsDict)
*取字典中所有关键字
*这一步其实是对outputs内容的读取，但读取的内容可能是地址信息
get_dict_param(outputsDict,'keys',[],outputsDictAllKeys)
*根据‘地址'信息将内容读入到元组中
get_dict_tuple(outputsDict,outputsDictAllKeys,outputsObjectDict)
*读取元组数据
get_dict_param(outputsObjectDict,'keys',[],outputsObjectDictALLKeys)
*元组中数据数量统计（其中元组中有小元组，而数量是指小元组的数量）
num:=|outputsObjectDictALLKeys|
*遍历
for keysIndex:=0 to num-1 by 1
try
get_dict_tuple(outputsObjectDict,outputsObjectDictALLKeys[keysIndex],objectDict)
get_dict_param(objectDict,'keys',[],objectDictAllKeys)
*标注类型 矩形框还是多边形
objectShape:=objectDictAllKeys[1]
get_dict_tuple (objectDict, objectDictAllKeys[1], objectLabelPosition)
get_dict_param(objectLabelPosition,'keys',[],objectLabelPositionDictAllKeys)
*矩形框
if(objectShape='bndbox')
get_dict_tuple(objectLabelPosition,objectLabelPositionDictAllKeys[0],xMin)
get_dict_tuple (objectLabelPosition, objectLabelPositionDictAllKeys[1], yMin)
get_dict_tuple (objectLabelPosition, objectLabelPositionDictAllKeys[2], xMax)
get_dict_tuple (objectLabelPosition, objectLabelPositionDictAllKeys[3], yMax)
*创建一个矩形
gen_rectangle1(labelRegion,yMin,xMin,yMax,xMax)
endif
*多边形
if(objectShape='polygon')
bufX:=[]
bufY:=[]
for keysIndex0:=0 to |objectLabelPositionDictAllKeys|/2-1 by 1
xAddr:=keysIndex0*2
yAddr:=xAddr+1
get_dict_tuple (objectLabelPosition, objectLabelPositionDictAllKeys[xAddr], positionX)
bufX:=[bufX,positionX]
get_dict_tuple (objectLabelPosition, objectLabelPositionDictAllKeys[yAddr], positionY)
bufY:=[bufY,positionY]
endfor
bufX:=[bufX,bufX[0]]
bufY:=[bufY,bufY[0]]
*创建多边形
gen_region_polygon(labelRegion,bufY,bufX)
fill_up(labelRegion,labelRegion)
endif
*读取 name 内容，存放到objectName中
get_dict_tuple(objectDict,objectDictAllKeys[0],objectName)
catch (Exception)
endtry
endfor
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