doctxtnameV25.cpp

/******************		Ver. 24  -  doctxtname.cpp		*********************


1.)

Bug : cannot pass objects of non-POD type 'struct std::string' through '...'
Wrong Code : 
	snprintf( titleBuf, TXT_NAME_LEN, "%d%s", 20, txtSuffixTitle );
Correct Code :  
	snprintf( titleBuf, TXT_NAME_LEN, "%d%s", 20, txtSuffixTitle.c_str() );
	
2.)

char*到 const char*直接給值就可以了, 所以在 snprintf 存到 char * buf 後, 
可以直接將 buf 內容 assign 給 std::string newsSourceTitle 。
	snprintf( titleBuf, TXT_NAME_LEN, "%d%s", 20, txtSuffixTitle.c_str() );
	newsSourceTitle = titleBuf; 


************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <strings.h>
#include <unistd.h>
#include <ctype.h>

#define TXT_NAME_LEN 100
#define PLEASE_SET_PATH 1 
	// if create_txtTitle() receives 1,then create different directory
#define DONOT_SET_PATH 0 
	// if create_txtTitle() receives 0,then the result txt file is in same dir.
using namespace std;

std::string create_txtTitle( int titleNumericPart, int setPathOpt )
{
// titleNumericPart is the numeric part in the txt file name
// eg, '28' of "28.txt" 

	FILE * newsFile;
	FILE * stemmingFile;
	FILE * stemmingResultFile;
	FILE * vectorFile;
	

	//std::string num_newsSourceTitle; //	const char * num_newsSourceTitle;
	//std::string num_stemResultTitle;	//	const char * num_stemResultTitle;
	//std::string num_vectorTitle;		//	const char * num_vectorTitle;
	std::string newsSourceTitle ;		//		const char * newsSourceTitle;	
	std::string stemResultTitle ;		//		const char * stemResultTitle;	
	std::string vectorTitle ;			//		const char * vectorTitle;
	std::string txtSuffixTitle = ".txt" ;
	std::string prefixPath = "\\vector\\" // the prefix path name of directory 
	
	char titleBuf[ TXT_NAME_LEN ];	
	
	if( setPathOpt == PLEASE_SET_PATH ){
		snprintf( titleBuf, TXT_NAME_LEN, "%d%s", titleNumericPart, txtSuffixTitle.c_str() );
	}		//  end-1-if
	else if( setPathOpt == DONOT_SET_PATH ){
		snprintf( titleBuf, TXT_NAME_LEN, "%s%d%s", pathPrefix, titleNumericPart, txtSuffixTitle.c_str() );
	}	//  end-1-if-else-if
	
	newsSourceTitle = titleBuf; 

	return newsSourceTitle ; 
	
} //		End - create_TxtTitle( ). 



/**********************************************************************/

int main4()
{
	std::string lala ; 
	lala = create_txtTitle( 33 );
	puts( lala.c_str() );
	
	system("PAUSE");	
}