第C++OpenCV讀寫XML或YAML文件的方法詳解/*

*filestorage_sampledemonstratetheusageoftheopencvserializationfunctionality

#include"opencv2/core.hpp"

#includeiostream

#includestring

usingstd::string;

usingstd::cout;

usingstd::endl;

usingstd::cerr;

usingstd::ostream;

usingnamespacecv;

staticvoidhelp(char**av)

cout"\nfilestorage_sampledemonstratetheusageoftheopencvserializationfunctionality.\n"

"usage:\n"

av[0]"outputfile.yml.gz\n"

"\noutputfileabovecanhavemanydifferentextensions,seebelow."

"\nThisprogramdemonstratestheuseofFileStorageforserialization,thatisinuseandinOpenCV\n"

"Forexample,howtocreateaclassandhaveitserialize,butalsohowtouseittoreadandwritematrices.\n"

"FileStorageallowsyoutoserializetovariousformatsspecifiedbythefileendtype."

"\nYoushouldtryusingdifferentfileextensions.(e.g.yamlymlxmlxml.gzyaml.gzetc...)\n"endl;

structMyData

MyData():

A(0),X(0),id()

explicitMyData(int):

A(97),X(CV_PI),id("mydata1234")

intA;

doubleX;

stringid;

voidwrite(FileStoragefs)const//Writeserializationforthisclass

fs"{""A"A"X"X"id"id"}";

voidread(constFileNodenode)//Readserializationforthisclass

A=(int)node["A"];

X=(double)node["X"];

id=(string)node["id"];

//Thesewriteandreadfunctionsmustexistaspertheinlinefunctionsinoperations.hpp

staticvoidwrite(FileStoragefs,conststd::string,constMyDatax){

x.write(fs);

staticvoidread(constFileNodenode,MyDatax,constMyDatadefault_value=MyData()){

if(node.empty())

x=default_value;

else

x.read(node);

staticostreamoperator(ostreamout,constMyDatam){

out"{id="m.id",";

out"X="m.X",";

out"A="m.A"}";

returnout;

intmain(intac,char**av)

cv::CommandLineParserparser(ac,av,

"{@input||}{helph||}"

if(parser.has("help"))

help(av);

return0;

stringfilename=parser.getstring("@input");

if(filename.empty())

help(av);

return1;

//write

FileStoragefs(filename,FileStorage::WRITE);

cout"writingimages\n";

fs"images""[";

fs"image1.jpg""myfi.png""baboon.jpg";

cout"image1.jpg""myfi.png""baboon.jpg"endl;

fs"]";

cout"writingmats\n";

MatR=Mat_double::eye(3,3),T=Mat_double::zeros(3,1);

cout"R="R"\n";

cout"T="T"\n";

fs"R"R;

fs"T"T;

cout"writingMyDatastruct\n";

MyDatam(1);

fs"mdata"m;

coutmendl;

//read

FileStoragefs(filename,FileStorage::READ);

if(!fs.isOpened())

cerr"failedtoopen"filenameendl;

help(av);

return1;

FileNoden=fs["images"];

if(n.type()!=FileNode::SEQ)

cerr"imagesisnotasequence!FAIL"endl;

return1;

cout"readingimages\n";

FileNodeIteratorit=n.begin(),it_end=n.end();

for(;it!=it_end;++it)

cout(string)*it"\n";

MatR,T;

cout"readingRandT"endl;

fs["R"]R;

fs["T"]T;

cout"R="R"\n";

cout"T="Tendl;

MyDatam;

fs["mdata"]m;

cout"readmdata\n";

coutmendl;

cout"attemptingtoreadmdata_b\n";//Showdefaultbehaviorforemptymatrix

fs["mdata_b"]m;

cout"readmdata_b\n";

coutmendl;

cout"Tryopening"filename"toseetheserializeddata."endlendl;

//readfromstring

cout"Readdatafromstring\n";

stringdataString=

"%YAML:1.0\n"

"mdata:\n"

"A:97\n"

"X:3.1415926535897931e+00\n"

"id:mydata1234\n";

MyDatam;

FileStoragefs(dataString,FileStorage::READ|FileStorage::MEMORY);

cout"attemptingtoreadmdata_bfromstring\n";//Showdefaultbehaviorforemptymatrix

fs["mdata"]m;

cout"readmdata\n";

coutmendl;

//writetostring

cout"Writedatatostring\n";

FileStoragefs(filename,FileStorage::WRITE|FileStorage::MEMORY|FileStorage::FORM