【お知らせ】この部分は英語原文のみでの提供となります。何卒ご了承ください。

2.2.7.3.2 JSON::ToString

1 Version
2 Description
3 Syntax
4 Parameters
5 Return
6 Examples
7 Remark
8 See Also
9 Header to Included

Version

Minimum Origin Version Required: Origin 2017 SR0

Description

Converts a struct/class object to a JSON string

Syntax

BOOL ToString( ClassObject data, string & str, OCJSONToString * params = NULL )

BOOL ToString( const vectorbase & data, string & str, OCJSONToString * params = NULL )

Parameters

data: [input] Reference to a struct/class/vectorbase object
str: [output] Stringified JSON string from given object
params: [input] Pointer to a struct that holds additional parameters. See struct OCJSONToString below

data: [input] Origin C vector to convert to Javascript array
str: [output] Stringified JSON string from given object
params: [input] Pointer to a struct that holds additional parameters. See struct OCJSONToString below

Return

TRUE on success, FALSE on failure

Examples

EX1

void ToString_ex1()
{
    RECT rect = {12,34,56,78};
    string strJSON;
    JSON.ToString(rect, strJSON);
    out_str(strJSON);
}

EX2

struct TestObj
{
    float ff;
    double dd;
    string str;
};

void ToString_ex2()
{
    TestObj obj;
    obj.ff = 1.234567890123456789;
    obj.dd = 1.234567890123456789;
    obj.str = "3.1415926";
    string strJSON1, strJSON2;
    OCJSONToString params;
    params.szFloatFmt = ".2"; //2 digits after decimal
    JSON.ToString(obj, strJSON1);
    JSON.ToString(obj, strJSON2, &params);
    out_str(strJSON1);
    out_str(strJSON2);
}

EX3

void TestJSON_vector()
{
	vector<string> vs1;
	vs1.Add("hello1");
	vs1.Add("hello2");
	vs1.Add("hello3");
	string strvs1;
	OCJSONToString param;
	param.dwFlags = JSONToStringFlagsDisableIndentation;
	JSON.ToString(vs1, strvs1, &param);
	string strvd1;
	vector<double> vd1;
	vd1.Add(3.14);
	vd1.Add(1024);
	vd1.Add(-3687.3645);
	JSON.ToString(vd1, strvd1, &param);
	
	string strvs2 = "[\"hello1\",\"hello2\",\"hello3\"]";
	vector<string> vs2;
	JSON.FromString(vs2, strvs2);
	string strvd2 = "[3.14, 1024, -3687.3645]";
	vector<double> vd2;
	JSON.FromString(vd2, strvd2);
	
	Worksheet wks;
	wks.Create("Origin");
	Dataset dsA(wks, 0);
	string strds1 = "[314.56, -963, 6317, 8]";
	JSON.FromString(dsA, strds1);
	string strds2;
	JSON.ToString(dsA, strds2);
}

EX4

(Origin2026)Convert Tree to JSON

void Tree_to_JSON_ex()
{
	//construct a tree
	Tree tr;
	tr.a.nVal = 123;
	//tr.a.sub.nVal = 2222;
	tr.b.strVal = "Hello";
	tr.c.dVal = 3.14;
	tr.a.SetAttribute("test1", 789);
	tr.a.SetAttribute("abc", "what");
	vector v1 = {1.23, 3.45, 6.78};
	
	tr.a.SetAttribute("v1", v1);
	
	vector vTemp1;
	tr.a.GetAttribute("v1", vTemp1);
	
	vector<int> vsTemp1;
	tr.a.GetAttribute("v1", vsTemp1);
	
	tr.d.test1.dVals = v1;
	tr.d.test2.SetAttribute("junk", 3.14);
	tr.d.test2.SetAttribute("arr", 4.79);
	tr.d.test2.SetAttribute("p1", (__int64)0x12345678abcdef01);
	tr.d.test2.SetAttribute("p2", (void*)&vsTemp1);
	vector<string> vs = {"tt1", "ok", "damn"};
	
	tr.a.SetAttribute("vs", vs);
	
	tr.d.test3.strVals = vs;
	
	matrix<double> mat;
	mat.SetSize(3, 4);
	for (int nRow = 0; nRow < 3; ++nRow)
	{
		for (int nCol = 0; nCol < 4; ++nCol)
			mat[nRow][nCol] = nRow+nCol * 6;
	}
	
	MatrixPage mp;
	mp.Create("origin");
	MatrixLayer ml = mp.Layers(0);
	Matrix Mat(ml);
	Mat = mat;
	
	int nCols = mat.GetNumCols();
	tr.d.test4.dVals2 = mat;
	
	matrix<double> mat2;
	mat2 = tr.d.test4.dVals2;
	
	string str;
	tr.GetString(str);
	//out_str(str);
	
	out_tree(tr);
	
	//Tree to JSON
	string str2;
	OCJSONToString params;
	params.dwFlags = JSONToStringFlagsConvertXMLElementsAttributes;
	JSON.ToString(tr, str2, &params);
	//out_str(str2);
	
	//JSON to Tree
	Tree tr2;
	OCJSONFromString params2;
	params2.dwLoad = JSONLOAD_CONVERT_XML_ELEMENTS_ATTRIBUTES;
	JSON.FromString(tr2, str2, &params2);
	
	out_tree(tr2);
}

Remark

Declaration of OCJSONToString

enum JSONToStringFlags {
	JSONToStringFlagsDisableIndentation = 0x00000001,
	JSONToStringFlagsConvertXMLElementsAttributes	= 0x00000002, //Origin2026's new bit, parse the XML and try to convert the elements and attributes into JSON object rather than a simple XML string.
};

typedef struct OCJSONToString
{
	const char*	szFloatFmt;
	DWORD dwFlags;
}OCJSONToString;

szFloatFmt

LabTalk formatting string. For a complete list of formatting options, please see the Origin Formats.

Always use dot as decimal point

use ftoaAlwaysUseDotAsDecimalPoint class with braces( so that it will not affect subsequent codes )

OCJSONToString params;
params.szFloatFmt = ".2"; // 2 digits after dot decimal sep.
string str;
{
	ftoaAlwaysUseDotAsDecimalPoint alwaysUseDot;
	JSON.ToString(st, str, &params);
}

Header to Included

origin.h