Adding Strings/File Output

For the following code; if I enter 'filename' as the filename, shouldn't this pass 'filename.txt.' to the ofstream? There MUST be an easier way to do this.. plus the fact it doesn't work.

Code:

---


        char filename[24];
        cout<<"Filename for data output (max 20 characters)->";
        cin.getline(filename, 20, '\n');
        filename[20] = '.';
        filename[21]='t';
        filename[22]='x';
        filename[23]='t';
        ofstream logfile(filename, ios::out | ios::end );
        logfile.seekp(ios::end);

---

Thanks.

instead of using an array to add one char per array element(., t, x, t), try this:

strcat(filename, ".txt");

or:

strcat(".txt", filename);

Code:

---

#include <apstring.h>

        apstring apfilename;
        cout<<"Filename for data output (max 20 characters)->";
        cin>>apfilename;
        apfilename += ".txt";
        ofstream logfile(apfilename.c_str(), ios::out | ios::end );

---

This is what I have now, exept I get no errors when compiling, but when I click 'Build .exe' I get:

Code:

---

--------------------Configuration: deviationcpp - Win32 Debug--------------------
Linking...
deviationcpp.obj : error LNK2001: unresolved external symbol "class ostream & __cdecl operator<<(class ostream &,class apstring const &)" (??6@YAAAVostream@@AAV0@ABVapstring@@@Z)
deviationcpp.obj : error LNK2001: unresolved external symbol "public: char const * __thiscall apstring::c_str(void)const " (?c_str@apstring@@QBEPBDXZ)
deviationcpp.obj : error LNK2001: unresolved external symbol "public: __thiscall apstring::~apstring(void)" (??1apstring@@QAE@XZ)
deviationcpp.obj : error LNK2001: unresolved external symbol "public: class apstring const & __thiscall apstring::operator+=(class apstring const &)" (??Yapstring@@QAEABV0@ABV0@@Z)
deviationcpp.obj : error LNK2001: unresolved external symbol "public: __thiscall apstring::apstring(char const *)" (??0apstring@@QAE@PBD@Z)
deviationcpp.obj : error LNK2001: unresolved external symbol "class istream & __cdecl operator>>(class istream &,class apstring &)" (??5@YAAAVistream@@AAV0@AAVapstring@@@Z)
deviationcpp.obj : error LNK2001: unresolved external symbol "public: __thiscall apstring::apstring(void)" (??0apstring@@QAE@XZ)
Debug/deviationcpp.exe : fatal error LNK1120: 7 unresolved externals
Error executing link.exe.

deviationcpp.exe - 8 error(s), 0 warning(s)

---

This is probably due to the ole32.lib file that came with apstring.cpp and apstring.h when I downloaded them, I don't know where to put it, I went to put it in VC98/Lib/ or something similar but it already existed, I'm sure this is what's causing the problem.

your compiler/linker can't file the apstring.h file. If you are sure it is with your compiler then try without the .h extension in the include.

No, It didn't come with my compiler, I had to download it (im using MSVC++ 6) I placed it in my directory with all the other .h files. Hmm.

did you download a cpp or lib file to associate with the header file?

Hi. I'm still a beginner in C++ but i'm catching on kinda quickly. But what I want to know is why my apstring header file isn't working? My compiler (Dev-C++) didn't come w/ apstring.h, so I had to download from the internet. But it doesn't work.
I receive the error " no match for `const char[8] << apstring &' " for my source file and " candidates are: class ostream & operator <<(ostream &, const apstring &) " for the apstring header file. Here's my source file that I made. Can you please help?

#include "apstring.h"
#include<iostream.h>


int main()
{
apstring name, rank;
char middle_initial;
int years_of_service;

cout<<"Enter the full name: ";
getline(cin, name);
cout<<"Enter the rank (Assistant, Associate, or Full): ";
cin>>rank;
cout<<"Enter the number of years of service: ";
cin>>years_of_service;
cout<<endl<<endl;
cout<<"name: "<<name<<endl;
cout<"Rank: "<<rank<<" Professor"<<endl;
cout<<"Years of service: "<<years_of_service<<endl;
return 0;
}