平时经常批量处理文件，需要从unicode 转 gbk，或者是gbk转unicode，手动转太麻烦了，又没有linux系统，perl又是对UTF-8比较适合，还是自己弄个程序吧

这个程序就是 将 in 文件夹下的所有文件从A编码转换成B编码，转换后的文件放到 out 文件夹下，文件名不变。0 代表 unicode2gbk，1 代表 gbk2unicode

wfopen有warning，但是改成_wfopen_s又运行不对，就暂时这样吧

#include "stdafx.h"
#include <windows.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>

#define LEN 1024
#define READLEN 1024
// 深度优先递归遍历目录中所有的文件
BOOL  unicode2gbk(FILE *fp_in,FILE*fp_out);
BOOL  gbk2unicode(FILE *fp_in,FILE*fp_out);
BOOL  DirectoryList(LPCWSTR Path,LPCWSTR out_Path,char mode);

BOOL  unicode2gbk(FILE *fp_in,FILE*fp_out)
{
	wchar_t inbuffer[READLEN];
	char outbuffer[READLEN*2];
	int num=0;
	size_t readlen=0;
	fseek(fp_in,2,0);
	while(fgetws(inbuffer,READLEN,fp_in)){
		num = WideCharToMultiByte(CP_ACP,0,inbuffer,-1,NULL,0,NULL,0);
		WideCharToMultiByte(CP_ACP,0,inbuffer,-1,outbuffer,num,NULL,0);
		fwrite(outbuffer,sizeof(char),num-1,fp_out);
	}
	return true;
}
BOOL  gbk2unicode(FILE *fp_in,FILE*fp_out)
{
	char inbuffer[READLEN];
	wchar_t outbuffer[READLEN];
	int num=0;
	size_t readlen=0;

	setlocale(LC_ALL,"Chinese_China");
	wchar_t tag=0xfeff;
	fwrite(&tag,sizeof(wchar_t),1,fp_out);
	while(fgets(inbuffer,READLEN,fp_in)){
		num = MultiByteToWideChar(CP_ACP,0,inbuffer,-1,NULL,0);
		MultiByteToWideChar(CP_ACP,0,inbuffer,-1,outbuffer,num);
		fwrite(outbuffer,sizeof(wchar_t),num-1,fp_out);
	}
	return true;
}
BOOL  DirectoryList(LPCWSTR Path,LPCWSTR out_Path,char mode)
{
	errno_t err;
	WIN32_FIND_DATA FindData;
	HANDLE hError;
	int FileCount = 0;
	wchar_t FilePathName[LEN];
	// 构造路径
	wchar_t FullPathName[LEN];
	wchar_t OutPathName[LEN];
	wcscpy_s(FilePathName, Path);
	wcscat_s(FilePathName, L"\\*.*");
	hError = FindFirstFile(FilePathName, &FindData);
	if (hError == INVALID_HANDLE_VALUE)
	{
		printf("搜索失败!");
		return 0;
	}
	while(::FindNextFile(hError, &FindData))
	{
		// 过虑.和..
		if (strcmp((char*)FindData.cFileName, ".") == 0|| strcmp((char*)FindData.cFileName, "..") == 0 )
		{
			continue;
		}
		// 构造完整路径输入路径，输出路径
		wsprintf(FullPathName, L"%s\\%s", Path,FindData.cFileName);
		wsprintf(OutPathName, L"%s\\%s", out_Path,FindData.cFileName);
		FileCount++;		
		// 输出本级的文件，运行到哪个文件
		wprintf(L"\n%d  %s  ", FileCount, FullPathName);


		//转换文件
		FILE * fp_in;
		FILE *fp_out;
		if((fp_in = _wfopen(FullPathName,L"rb")) == NULL)
		{
			printf("cannot open this file %s\n",FullPathName);
			return false;
		}
		if((fp_out = _wfopen(OutPathName,L"wb")) == NULL)
		{
			printf("cannot open this file %s\n",OutPathName);
			return false;
		}
		//转换函数
		if (mode==0)//unicode2gbk
		{
			unicode2gbk(fp_in,fp_out);
		}else if (mode==1)//gbk2unicode
		{
			gbk2unicode(fp_in,fp_out);
		}
		fclose(fp_in);
		fclose(fp_out);
		if (FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
		{
			printf("<Dir>");
			DirectoryList(FullPathName,OutPathName,mode);
		}
	}
	return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
	DirectoryList(L"in",L"out",0);
	//DirectoryList(L"out",L"in",1);
	return 0;
}