CDR可以提供對(duì)基本數(shù)據(jù)類型如int，short，double，string等的序列化機(jī)制，簡(jiǎn)單包裝后即可擔(dān)當(dāng)RPC中的序列化角色。
#include <iostream>
#include <string>
#include <ace/OS.h>
#include <ace/String_Base.h>
#include <ace/CDR_Stream.h>
using namespace std;
#pragma comment(lib,"aced")
int main(int argc, char* argv[])
{
cout << "ACE CDR demo" << endl;
ACE_CString sAppName = "CDRDemo",sAppName2;
ACE_CDR::Long nUID = 123456,nUID2;
ACE_CDR::Float nfPosX = 120.51,nfPosX2;
ACE_CDR::Double ndScore = 120.51,ndScore2;
ACE_CString sDummy = "another string",sDummy2;
ACE_CDR::Short nsLength = 10,nsLength2;
ACE_OutputCDR outCDR(ACE_DEFAULT_CDR_BUFSIZE);
outCDR << nUID;
outCDR << nfPosX;
outCDR << ndScore;
outCDR << sAppName;//寫字符串時(shí)，先寫入字符串的長(zhǎng)度
outCDR << sDummy;
outCDR << nsLength;
cout << "OutputCDR size = " << outCDR.length() << endl;
//可以通過(guò)socket發(fā)送出去,而在服務(wù)端進(jìn)行下面的解析
//1.ACE_Message_Block *ACE_OutputCDR::begin (void)
//2.通過(guò)ACE_SOCK_Stream發(fā)送出去
ACE_InputCDR inCDR(outCDR);
inCDR >> nUID2;
inCDR >> nfPosX2;
inCDR >> ndScore2;
inCDR >> sAppName2;
inCDR >> sDummy2;
inCDR >> nsLength2;
ACE_ASSERT(nUID == nUID2);
ACE_ASSERT(nfPosX == nfPosX2);
ACE_ASSERT(ndScore == ndScore2);
ACE_ASSERT(sAppName == sAppName2);
ACE_ASSERT(sDummy == sDummy2);
ACE_ASSERT(nsLength == nsLength2);
cout << "test ok." << endl;
return 0;
}假若有如下的demo.idl,內(nèi)容如下：
struct user_info
{
int user_id;
string user_name;
}
利用idl_gen生成代碼時(shí)：
(1)如果是侵入式的方案，則生成user_info類時(shí)，自動(dòng)添加成員OutputCDR和InputCDR成員，并添加pack(ACE_Message_Block &* msg)和parse(ACE_Message_Block * msg)成員函數(shù)，在pack和parse里面，調(diào)到對(duì)于的CDR類，按照類中數(shù)據(jù)成員的聲明順序依次序列化，反序列化
(2)如果是非侵入式方案，則生成user_info類時(shí)，生成獨(dú)立函數(shù)的pack(user_info& info, ACE_Message_Block &* msg)和parse(user_info& info,ACE_Message_Block * msg),pack和parse的函數(shù)實(shí)現(xiàn)同上