中文字符串写入文本文件及从文本文件中读取中文字符串

1 中文字符串（或中英混杂）写入文本文件

void fCStringprintf(CString str,FILE*f)
{
	int len=str.GetLength();
	int l=0;
	for (int i=0;i<len;i++)//中文字符数统计
	{
		if (str[i]>255)
		{
			l++;
		}
	}
	char *charstemp=new char[len+l+1];charstemp[len+l]='\0';
	WideCharToMultiByte(CP_ACP,0,str,len,charstemp,len+l,NULL,NULL);
	fprintf(f,"%s",charstemp);
	delete []charstemp;
}

2 从文本文件中读取中文字符串（或中英混杂）

2.1 读取到CString对象中

bool fCStringscanf_s(CString *str,int len,FILE*f)
{
	char *name=new char[len];
	if (fscanf_s(f,"%s",name,len)!=1)
	{
		*str=_T("");
		delete []name;
		return false;
	}
	CString v(name);
	*str=v;
	delete []name;

	return true;
}

2.2 读取到WCHAR数组中

bool fWCHARArrayscanf_s(WCHAR *buffer,int len,FILE*f)//参数buffer是len长度的WCHAR数组
{
	char *name=new char[len];
	if (fscanf_s(f,"%s",name,len)!=1)
	{
		delete []name;
		return false;
	}
	ASSERT(buffer!=NULL);
	for(int i=0;i<len;i++)//函数MultiByteToWideChar不会为数组的最后一个字符的下一字符赋值0，故必须先都初始化为0，表征数组的结束。
	{
		buffer[i]=0;
	}
	MultiByteToWideChar(CP_ACP,0,name,int(strlen(name)),buffer,len);
	delete []name;

	return true;
}

3.下面写一段代码对以上三个函数进行测试

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
	int nRetCode = 0;

	// initialize MFC and print and error on failure
	if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
	{
		// TODO: change error code to suit your needs
		_tprintf(_T("Fatal Error: MFC initialization failed\n"));
		nRetCode = 1;
	}
	else
	{
		//写文件
		CString filename=_T("test.txt");
		FILE*wf=_wfopen(filename,_T("w+"));
		if (!wf)
		{
			return 0;
		}
		CString str=_T("测试代码test");//中英混杂的字符串
		fCStringprintf(str,wf);
		fclose(wf);
		//读文件-1
		FILE*f=_wfopen(filename,_T("r+"));
		if (!f)
		{
			return 0;
		}
		int len=100;
		WCHAR *buffer=new WCHAR[len];
		fWCHARArrayscanf_s(buffer,len,f);
		CString str1(buffer);
		delete []buffer;
		AfxMessageBox(str1);
		fclose(f);
		//读文件-2
		f=_wfopen(filename,_T("r+"));
		if (!f)
		{
			return 0;
		}
		CString str2;
		fCStringscanf_s(&str2,len,f);
		AfxMessageBox(str2);
		fclose(f);
	}

	return nRetCode;
}