如何在 RapidJSON 中将 JSON 写入 cout

RapidJSON 不提供将 JSON 序列化到 cout（= stdout）的直接方法，但你可以使用 OStreamWrapper 来实现：

rapidjson_ostream_example.cpp

#include <rapidjson/writer.h>
#include <rapidjson/ostreamwrapper.h>
// ...
OStreamWrapper out(cout);
Writer<OStreamWrapper> writer(out);
doc.Accept(writer);

#include <rapidjson/writer.h>
#include <rapidjson/ostreamwrapper.h>
// ...
OStreamWrapper out(cout);
Writer<OStreamWrapper> writer(out);
doc.Accept(writer);

完整示例：

rapidjson_full_example.cpp

#include <iostream>
#include <rapidjson/document.h>
#include <rapidjson/writer.h>
#include <rapidjson/ostreamwrapper.h>
using namespace rapidjson;
using namespace std;

int main() {
    // 生成文档：{"text": "Hello JSON!"}
    Document doc;
    doc.SetObject(); // 使 doc 成为对象！
    doc.AddMember("text", "Hello JSON!", doc.GetAllocator());
    // 写入 stdout
    OStreamWrapper out(cout);
    Writer<OStreamWrapper> writer(out);
    doc.Accept(writer);
}

#include <iostream>
#include <rapidjson/document.h>
#include <rapidjson/writer.h>
#include <rapidjson/ostreamwrapper.h>
using namespace rapidjson;
using namespace std;

int main() {
    // 生成文档：{"text": "Hello JSON!"}
    Document doc;
    doc.SetObject(); // 使 doc 成为对象！
    doc.AddMember("text", "Hello JSON!", doc.GetAllocator());
    // 写入 stdout
    OStreamWrapper out(cout);
    Writer<OStreamWrapper> writer(out);
    doc.Accept(writer);
}

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