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hi,
when code compiled is with a c++ compiler the code needs to be c++ compiler compatible.
C code is almost 90% compliant to c++ code, but there are some distinct issues that one must
know off.
thierrypp wrote: LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
this error means that the compiler didn't find the main entry point of your code.
you did write
#include <something>
main()
{
you did forget to add a return value for your main function. Some C compilers automatically asume that you meant to write int main(void) but most C++ compilers don't do this automatic translation. Thats way the function main didn't compile hence there is no function to link too -> Unresolved external
The rest of the code looks fine.
codito ergo sum
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yes, right,
#include <stdio.h>
#include <stdlib.h>
but I do not get how to deal with main,
what should be modified?
Thanks,
T.
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hi,
try to change main() to void main()
codito ergo sum
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again error:
C:\Documents and Settings\atvd\Desktop\New Folder00ppp\wwww\wwww.cpp(72) : error C2440: '=' : cannot convert from 'void *' to 'struct etudiant *'
Conversion from 'void*' to pointer to non-'void' requires an explicit cast
Error executing cl.exe.
wwww.exe - 1 error(s), 0 warning(s)
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BadKarma wrote: ...but most C++ compilers don't do this automatic translation.
Visual Studio v6 handles this just fine. He is doing something else wrong as his code compiles fine as a .c file or a .cpp file. I suspect it's the type of project he chose.
"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb
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DavidCrow wrote: Visual Studio v6 handles this just fine. He is doing something else wrong as his code compiles fine as a .c file or a .cpp file. I suspect it's the type of project he chose.
When I tested the code i wrongfully pasted the code in a .cpp file which led to the unresolved error which I mentioned. I do however used VS2005 to test. When renamed to a .c file everything compiles and links without a problem.
Sorry to add up the confusion 
codito ergo sum
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thank you...but I turned it and tested it.....same ..errors
listen, I do not want to abuse too much...
my mail is
thierrypp@yahoo.com
if you want, I will send you a typical set of files and you could send me screenshots?
I would be very grateful if you could.
I am working on Visual C++ 6.0 with standard edition provided with Ivor Horton book, and indeed I made a lot of successful applications with VC++ 6.0.
But with C.....I followed before your link and after and the problems remains...what a pity!
Thanks a lot!
The big problem is that the company left for several months nobody in charge of managing this and after restructuration, no notes, nothing....only me to deal with...
Best regards and thanks,
Thierry
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a typical example, no *.h files
/* ---------------------- */
/* structure_en_globale.c */
/* ---------------------- */
#include <stdio.h>
#include <string.h>
/* -- declaration des constantes -- */
#define TAILLE_NOM 20
#define TAILLE_PRENOM 2*TAILLE_NOM
#define MAX_ETUDIANTS 50
struct etudiant {
char nom[TAILLE_NOM] ;
char prenom[TAILLE_PRENOM] ;
int age ;
} ;
/* -- variables globales -- */
int nbeleves=0 ;
struct etudiant tab_eleves[MAX_ETUDIANTS];
/* -- procedures et fonctions -- */
void saisie_eleves();
void affichage() ;
struct etudiant recherche_eleve(char nom_recherche[]);
/* ----------------------------------- */
main()
{
struct etudiant eleve ;
char nom_eleve[TAILLE_NOM] ;
int choix = -1 ;
/* -- boucle d'affichage du menu -- */
while (choix != 0 )
{
printf("\n");
printf(" -1- Saisie d'une liste d'Žlves \n");
printf(" -2- Recherche d'un Žlve \n");
printf(" -3- Affichage de la liste\n");
printf(" -0- FIN\n");
printf("\n");
printf("Choix:");
scanf("%d",&choix);
/* -- selecteur : appel des procedures -- */
switch (choix)
{
case 1 : saisie_eleves();
break ;
case 2 : printf("Entrez le nom de l'Žlve :");
scanf ("%s",nom_eleve);
eleve=recherche_eleve(nom_eleve);
if (! strcmp(eleve.nom,"NON_TROUVE"))
{
printf("Aucun %s trouvŽ\n",nom_eleve);
}
else
{
printf("Nom : %s\n",eleve.nom);
printf("PrŽnom : %s\n",eleve.prenom);
printf("Age : %d\n",eleve.age);
}
break ;
case 3 : affichage();
break ;
case 0 : printf("Au revoir \n");
break ;
default: printf("Erreur de saisie\n");
break;
}
}
}
/* ----------------------------------- */
void saisie_eleves()
{
struct etudiant studtmp ;
int termine ;
termine = 0 ;
/* -- boucle de saisie du tableau des eleves -- */
while (! termine)
{
printf("Entrez un nom (\"fin\" pour terminer):");
scanf("%s",studtmp.nom);
termine=((strcmp(studtmp.nom,"fin"))==0) ;
if (! termine)
{
printf("Entrez un prŽnom:");
scanf("%s",studtmp.prenom);
printf("Entrez un age:");
scanf("%d",&studtmp.age);
tab_eleves[nbeleves]=studtmp ;
nbeleves++ ;
}
}
}
/* ----------------------------------- */
struct etudiant recherche_eleve(char nom_recherche[])
{
struct etudiant studtmp, eleve_retour={"NON_TROUVE","",0};
int trouve, i ;
trouve = 0 ;
i = 0 ;
while ((! trouve) && (i < nbeleves) )
{
studtmp=tab_eleves[i++] ;
trouve=(!(strcmp(studtmp.nom,nom_recherche))) ;
if (trouve)
{
eleve_retour=studtmp ;
}
}
/* -- retourne une structure -- */
return eleve_retour ;
}
/* ----------------------------------- */
void affichage()
{
int i ;
printf("-- Liste des Žtudiants --\n");
for (i=0 ; i < nbeleves ; i++)
{
printf("%10s ",tab_eleves[i].nom);
printf("%10s ",tab_eleves[i].prenom);
printf("%4d\n", tab_eleves[i].age);
}
}
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sorry,
with:
#include <stdio.h>
#include <stdlib.h>
I am so upset to get it right!
yes, win32 checked and sub console too in the linker option too!
Thanks for your very helpful help.
Knowing finally how to deal with C files on Visual C++ would be of the utmost importance!
Best Regards,
Please, feel free to send me any screenshots.....I welcome you!
T.
Switzerland
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thierrypp wrote: May I know how to work with c files on a visual C++ 6.0 IDE?
Two possibilities:
1. You want to keep the project as a c-project, then you need to change the calling convention in your project settings.
2. You do not care about it being c or c++, then simply rename your .c files .cpp and everything will be ok.
Hope this helps
~RaGE();
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thanks for the informations but in fact, the problem remains......
Maybe if someone knows about Lcc-win 32?
Regards
T.
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Thierry,
I approached this in a methodical way. Follow me and you should be OK:
In Visual C++ 6.0 create a new project. Choose Win 32 Console Application, select a simple application.
Delete the lines:
int main(int argc, char* argv[])
{
return 0;
}
Copy the code in. I used one of the examples you supplied.
Compile: get 5 errors, 1 warning. Looking at what the errors were, I deleted the following two lines which are clearly wrong:
#include
#include
The other three errors are about printf, scanf, strcmp not being recognised. I guess that I need to include some files. I moved the cursor on to the word printf and hit the F1 key. Visual C++ 6.0 gave some information on how to use this function. It also said that it needed the include file <stdio.h>. Same for scanf. For strcmp, Visual C++ 6.0 says that I need to include <syting.h>. So I added the next two lines.
#include <stdio.h>
#include <string.h>
Now there is a warning:
warning C4508: 'main' : function should return a value; 'void' return type assumed
Being just a warning, I could have ignored this. But to do the job properly, as I have been told that main() should return a value, I changed the line
main()
to be:
int main()
and to return a value, I added the following line just before the end of the main() function:
return 0;
Et voila! It compiles. And runs. No problemo, as they say. (And by the way, the source file that Visual C++ created is indeed .CPP, not .C)
Shraddhan
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Oops!
The bit biter swallowed some of my text.
Yhe files to be included are stdio.h and string.h
I guess that because these names were included inside angle brackets they got chopped off. That is preumably the reason why they were missing from the code sample you supplied.
Bon chance,
Shraddhan
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I am writing an GUI using MFC. However, I have one problem. After I type in an Edit Control and then press enter, the GUI will be closed. I want the GUI to remain there after I press enter, so how do I disable this function?
Thanks
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first of u need to give a detail ... r u making a edit ctrl on the modal dialog box ... if yes then the model dlg box takes enter as ONOK event .... u need to catch enter in edit box only..... check for some "want return" kind of setting in resource editor
===============================================================
Want return
Specifies that a carriage return be inserted when the user presses the ENTER key while typing text into a multiline edit-box control. If this style is not specified, pressing the ENTER key has the same effect as pressing the dialog box’s default command button. This style has no effect on a single-line edit-box control. Type: Bool. Default: False
===============================================================
if not the dlg box then pls give more detail
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Hi,
There are many ways this is one such way :-
void CTreyDlg::OnOK() <br />
{<br />
int a = ::GetKeyState (VK_RETURN);<br />
if (a & 0x8000)<br />
return ;<br />
CDialog::OnOK();<br />
}
Regards,
FarPointer
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Thanks a lot. I have solved my problem
I really appreciate you guys' help
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Hi,
But i must warn you that if you have tried that code ,then even a focus created through tab( on the OK button ) wont be able to close the application , The best way is to use Pretranslatemessage
please check this link
http://www.flounder.com/messaging.htm[^]
Regards,
FarPointer
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See here.
"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb
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Hi ,
In that he says we should remove the CDialog::OnOk(), if thats the case then if the user wants the dialog to be closed on the ok button click how will that happen ,or we should create a new button with a different ID other that IDOK , if thats the case then i feel its too much of work and pretranslate message should be good enough.
Regards,
FarPointer
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FarPointer wrote: In that he says we should remove the CDialog::OnOk(),
I think it's given to handle OnOk. So precisely it must do that. What we can do is that we can give a MessageBox prompting the user if he wants to close the dialog or not.
Jesus Loves ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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Hi
Does anybody know a viewer tool to see and extract the files from a setup.exe file generated by ISE 2.2 ?
Thank's for your help
Jérôme
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I downloaded a program that simulates a UNIVAC computer and I wrote some code for it in C++ and I tried loading it as a servo. Can someone post the Assembly source code I should put in the univactest2.cpp and the univactest2.obj files. THE .CPP FILE SHOULD BE TRANSLATED INTO A .ASM FILE.
--------------------------
Eric
I still need to learn C++!
--------------------------
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NO.
but less seriously, I don't understand what you are trying to do ? I assume the simulator reads some sort of UNIVAC language, and me think it's not x86 assembly; and more important, if it's a real UNIVAC simulator, I think it would be very hard to do C++ on it, even if could translate the C++ language to UNIVAC language it would be SOOO big that it would be useless.
Maximilien Lincourt
Your Head A Splode - Strong Bad
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