Hi,
I am trying to write a simple c++ script to learn more about file manipulation. First script is adding some info a file as a structure and second one is reading from the file. However when i try to read from my file it always shows the found values twice. I tried lots of things but couldnt find out where i am doing wrong. Either adding values twice or reading them twice. I appreciate if someone can lead me to the right direction. Here are my 2 scripts.
This one is used to write to the file
#include <fstream>
#include <iostream>
#include <cstring>
//#pragma hdrstop
using namespace std;
struct info
{
char name[50];
int yas;
};
int main()
{
char Buffer[512];
string newBuffer;
int InputLength = atoi( getenv("CONTENT_LENGTH") );
fread( Buffer, InputLength, 1, stdin );
cout<<"content-type: text/html"<<endl;
cout<<""<<endl;
//html kodu
cout<<"<html><head>"<<endl;
cout<<"<title>ORNEK CGI UYGULAMASI</title>"<<endl;
cout<<"<body>"<<endl;
newBuffer = static_cast<string>(Buffer);
free (Buffer);
int loc = newBuffer.find_last_of('&');
string submittedquery = newBuffer.substr(0, loc);
int stringboyutu = submittedquery.length();
int loc2 = submittedquery.find('&');
string ad = submittedquery.substr(0, loc2);
string yas = submittedquery.substr(loc2+1, stringboyutu);
int adboyutu = ad.length();
int yasboyutu = yas.length();
int adbaslamayeri = ad.find('=');
int yasbaslamayeri = yas.find('=');
string tamad;
tamad = ad.substr(adbaslamayeri+1, adboyutu);
string tamyas = yas.substr(yasbaslamayeri+1, yasboyutu);
cout<<"Adiniz: "+tamad<<endl;
cout<<"<br>"<<endl;
cout<<"Yasiniz: "+tamyas<<endl;
cout<<"</body>"<<endl;
cout<<"</html>"<<endl;
info myinput;
int TempNumOne=tamad.size();
for (int a=0;a<TempNumOne;a++)
{
myinput.name[a]=tamad[a];
if (a==(TempNumOne-1)){
myinput.name[TempNumOne] = '\0';
}
}
//menu1.name = static_cast<char>(tamad);
myinput.yas = atoi(tamyas.c_str());
ofstream file;
file.open("bilgi.dat",ios::app | ios::binary );
file.write((char*)&myinput,sizeof(info));
file.close();
return 0;
}This one is used to read from file
#include <cstdlib>
#include <fstream>
#include <iostream>
//#pragma hdrstop
using namespace std;
struct info
{
char name[50];
int yas;
};
int main()
{
char Buffer[512];
string newBuffer;
int InputLength = atoi( getenv("CONTENT_LENGTH") );
fread( Buffer, InputLength, 1, stdin );
cout<<"content-type: text/html"<<endl;
cout<<""<<endl;
//html kodu
cout<<"<body>"<<endl;
cout<<"Bulunan kullanici:<br>"<<endl;
int position;
newBuffer = static_cast<string>(Buffer);
free (Buffer);
int loc = newBuffer.find('&');
string ad = newBuffer.substr(0, loc);
int adbaslamayeri = ad.find('=');
int adboyutu = ad.length();
string tamad = ad.substr(adbaslamayeri+1, adboyutu);
info myinput;
fstream file;
file.open("bilgi.dat",ios::in|ios::binary);
file.seekg(0,ios::end);//dosya sonuna git
int endposition = file.tellg();
file.seekg(0);
int totalrecords = endposition/ sizeof(info);
for (int rec_no =0; rec_no<totalrecords; rec_no++){
position = rec_no*sizeof(info);
file.seekg(position);
file.read((char*)&myinput,sizeof(info));
file.seekg(0);
if (!file.good ())
break;
if ((static_cast<string>(myinput.name)) == (tamad+"\0")){
cout<<"Ad:"<<endl;
cout<<myinput.name<<endl;
cout<<"Yas:"<<endl;
cout<<myinput.yas<<endl;
cout<<"<br>"<<endl;
}
}
cout<<"</body>"<<endl;
cout<<totalrecords<<endl; /*wrote this to see total records, and it shows the records twice */
return 0;
}
