Windows专门针对INI文件的API

主要有：ReadPrivateProfileString WritePrivateProfileString ReadPrivateProfileInit WritePrivateProfileInt

需要注意的一点是：GET方法可能需要使用者提供一个如果获取失败用来代替的值。

测试代码：

void main()
{
    const int LEN = 100;
    WCHAR buffer[LEN] = {0};
    DWORD lSize = GetPrivateProfileString(L"NETWORK", L"Server", L"NotExist!", buffer, LEN, L".\Test.ini");//strange: "Test.ini" fail, but ".\Test.ini" suc
    
    WritePrivateProfileString(L"Tup", L"Sex", L"man", L".\Test.ini");


    wcout<<L"buffer:  "<<buffer<<endl;
    cout<<"return size:  "<<lSize<<endl;

    system("pause");
}

// Demo4Ini.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <windows.h>
#include <fstream>
#include <iostream>
// #include <io.h>
using namespace std;

#define CFG_INI_FILENAME L"./test.ini" //晕! 如果只指定"test.ini" 会在C:Windows下创建
#define AREA_NETWORK     L"NETWORK"
#define KEY_SERVER       L"Server"
#define VAL_DEF_SERVER   L"127.0.0.1"
#define AREA_PEOPLE      L"PEOPLE"
#define KEY_NAME         L"Name"
#define VAL_DEF_NAME     L"Alex Hong"
#define KEY_AGE          L"Age"
#define VAL_DEF_AGE      L"24"
#define VAL_DEF_NOTEXIST L"NotExist!"

void EmptyIni();
void ReadIni();
void WriteIni();

int _tmain(int argc, _TCHAR* argv[])
{
    EmptyIni();
    ReadIni();
    WriteIni();
    ReadIni();



    cout<<"OVER."<<endl;
    getchar();

    return 0;
}

void EmptyIni()
{
    //一般执行步骤：删除文件，创建一个空的同名文件
    //如果删除失败，那么文件肯定被占用，此时写了也可能白写（被其他覆盖）这种情况不应该出现，所以不考虑

    cout<<"==============EmptyIni Module============"<<endl;
    if((_waccess(CFG_INI_FILENAME, 0) ==0 ) && !::DeleteFileW(CFG_INI_FILENAME)) //存在且删除失败
        return;

    wfstream fInOut(CFG_INI_FILENAME, ios::out);
    if(!fInOut.fail())
    {
        cout<<".ini file exists."<<endl;
        cout<<"clear over."<<endl;
    }
    else
    {
        cout<<".ini file doesn't exist."<<endl;
    }

    fInOut.close();
    fInOut.clear(); //clear all good or bad bits
}

void ReadIni()
{
    cout<<"==================ReadIni Module================="<<endl;
    const int LEN = 100;
    WCHAR buffer[LEN] = {0};
    DWORD lSize = GetPrivateProfileStringW(AREA_NETWORK, KEY_SERVER, VAL_DEF_NOTEXIST, buffer, LEN, CFG_INI_FILENAME);
    wcout<<L"Server: "<<buffer<<"  Size: "<<lSize<<endl;
    
    lSize = GetPrivateProfileStringW(AREA_PEOPLE, KEY_NAME, VAL_DEF_NOTEXIST, buffer, LEN, CFG_INI_FILENAME);
    wcout<<L"Name: "<<buffer<<"  Size: "<<lSize<<endl;

    lSize = GetPrivateProfileIntW(AREA_PEOPLE, KEY_AGE, -1, CFG_INI_FILENAME);
    wcout<<L"Age:  "<<lSize<<endl;
}

void WriteIni()
{
    cout<<"==================WriteIni Module================="<<endl;
    WritePrivateProfileStringW(AREA_NETWORK, KEY_SERVER, VAL_DEF_SERVER, CFG_INI_FILENAME);
    WritePrivateProfileStringW(AREA_PEOPLE, KEY_NAME, VAL_DEF_NAME, CFG_INI_FILENAME);
    WritePrivateProfileStringW(AREA_PEOPLE, KEY_AGE, VAL_DEF_AGE, CFG_INI_FILENAME); //int也按string写，只不过读的时候转化下
}