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I'm writing an app in console mode using Visual C++ 4.0 and after compiling, I get the following error messages:
Myfile.obj:error LNK2001:unresolved external symbol "void_cdecl slrscr(void)"(?clrscr@@YAXXZ)
Myfile.exe:fatal error LNK1120: 1 unresolved externals
Can anybody help me?
Hi,
You are getting this message because the function clrscr() does not exist.
You can use the following code to clear the screen:
Note: This code is from MSDN, so it should work. If not, complain to MS.
// Code starts here
/* Standard error macro for reporting API errors */
#define PERR(bSuccess, api){if(!(bSuccess)) printf("%s:Error %d from %s \
on line %d\n", __FILE__, GetLastError(), api, __LINE__);}
void cls( HANDLE hConsole )
{
COORD coordScreen = { 0, 0 }; /* here's where we'll home the
cursor */
BOOL bSuccess;
DWORD cCharsWritten;
CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
DWORD dwConSize; /* number of character cells in
the current buffer */
/* get the number of character cells in the current buffer */
bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );
PERR( bSuccess, "GetConsoleScreenBufferInfo" );
dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
/* fill the entire screen with blanks */
bSuccess = FillConsoleOutputCharacter( hConsole, (TCHAR) ' ',
dwConSize, coordScreen, &cCharsWritten );
PERR( bSuccess, "FillConsoleOutputCharacter" );
/* get the current text attribute */
bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );
PERR( bSuccess, "ConsoleScreenBufferInfo" );
/* now set the buffer's attributes accordingly */
bSuccess = FillConsoleOutputAttribute( hConsole, csbi.wAttributes,
dwConSize, coordScreen, &cCharsWritten );
PERR( bSuccess, "FillConsoleOutputAttribute" );
/* put the cursor at (0, 0) */
bSuccess = SetConsoleCursorPosition( hConsole, coordScreen );
PERR( bSuccess, "SetConsoleCursorPosition" );
return;
}
// Code Ends Here
I hope this helps.
Daniel.
Hi.
clrscr() surely exists.
You need the header file - conio.h
#include <conio.h> //non-standard header file needed
//for use of clear screen function clrscr.
However, even though you type this header file on your project and
you get error message, VC++ seems not to support this function.
Turbo C++ supports this.(my school project two years ago)
Hope for help.
-Masaaki Onishi-