JSON文件如下：

{"errorCode":0,"reason":"OK","result":{"userId":10086,"name":"中國移動"},"numbers":[110,120,119,911] }

目錄結構如下：

程序運行截圖如下：

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源碼如下：

#include <iostream> #include <string> #include "rapidjson/document.h" #include "rapidjson/writer.h" #include "rapidjson/stringbuffer.h"using namespace rapidjson; using namespace std;string readfile(const char *filename){FILE *fp = fopen(filename, "rb");if(!fp){printf("open failed! file: %s", filename);return "";}char *buf = new char[1024*16];int n = fread(buf, 1, 1024*16, fp);fclose(fp);string result;if(n>=0){result.append(buf, 0, n);}delete []buf;return result; }int parseJSON(const char *jsonstr){Document d;if(d.Parse(jsonstr).HasParseError()){printf("parse error!\n");return -1;}if(!d.IsObject()){printf("should be an object!\n");return -1;}if(d.HasMember("errorCode")){Value &m = d["errorCode"];int v = m.GetInt();printf("errorCode: %d\n", v);}printf("show numbers: \n");if(d.HasMember("numbers")){Value &m = d["numbers"];if(m.IsArray()){for(int i = 0; i < m.Size(); i++){Value &e = m[i];int n = e.GetInt();printf("%d,", n);}}}return 0; }int parseJSON2(const char *jsonstr){Document d;if(d.Parse(jsonstr).HasParseError()){throw string("parse error!\n");}if(!d.IsObject()){throw string("should be an object!\n");}if(!d.HasMember("errorCode")){throw string("'errorCode' no found!");}Value &m = d["errorCode"];int v = m.GetInt();printf("errorCode: %d\n", v);printf("show numbers:\n");if(d.HasMember("numbers")){Value &m = d["numbers"];if(m.IsArray()){for(int i = 0; i < m.Size(); i++){Value &e = m[i];int n = e.GetInt();printf("%d", n);}}}return 0; }int main(){string jsonstr = readfile("example.json");//parseJSON(jsonstr.c_str());try{parseJSON2(jsonstr.c_str());}catch(string e){printf("error: %s \n", e.c_str());}getchar();return 0; }

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總結

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