Cannot compile a C program in Visual C++ Express

**daYz** · 03-09-2008

Hi,

I am trying to compile a C program in Visual C++ 2005 Express but I get some errors. Can someone tell me how I can resolve this?

I use the following C code:

Code:

#include <winsock2.h>
#include <windows.h>
#include <stdio.h>



int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
    {
         
          WORD versie;
          versie = MAKEWORD ( 2, 2);
          WSADATA wsaData;
          int resultaat;
          
          resultaat = WSAStartup(versie, &wsaData);
          
          if ( resultaat != 0 ){
               printf("WSAStartup error");
               }
          
          SOCKET mijnsocket;

          
          mijnsocket = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
          
          if ( socketresultaat == INVALID_SOCKET){
               printf("WSASocket errror");
               }
               
          struct sockaddr_in gegevens;
          
          
	  gegevens.sin_family = AF_INET;
          gegevens.sin_port = htons(7777);
          gegevens.sin_addr.s_addr = inet_addr("127.0.0.1");
          memset(&(gegevens.sin_zero), '\0', 8);
  
          
		  int bindresultaat;        
          
		  bindresultaat = bind( mijnsocket, (struct sockaddr *) &gegevens, sizeof( struct sockaddr_in ) );
          
		  if (bindresultaat == SOCKET_ERROR ){
                            printf("Bind error");
                            }
          
		  listen(mijnsocket, 1);

                     
          accept(mijnsocket, (struct sockaddr *)&gegevens, sizeof(struct sockaddr_in));

          return 0;
          
          }

The errors are:

Code:

c:\documents and settings\tex\bureaublad\wsa2.c(13) : error C2275: 'WSADATA' : illegal use of this type as an expression
        c:\program files\microsoft platform sdk\include\winsock2.h(426) : see declaration of 'WSADATA'
c:\documents and settings\tex\bureaublad\wsa2.c(13) : error C2146: syntax error : missing ';' before identifier 'wsaData'
c:\documents and settings\tex\bureaublad\wsa2.c(13) : error C2065: 'wsaData' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(14) : error C2143: syntax error : missing ';' before 'type'
c:\documents and settings\tex\bureaublad\wsa2.c(16) : error C2065: 'resultaat' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(16) : warning C4133: 'function' : incompatible types - from 'int *__w64 ' to 'LPWSADATA'
c:\documents and settings\tex\bureaublad\wsa2.c(22) : error C2275: 'SOCKET' : illegal use of this type as an expression
        c:\program files\microsoft platform sdk\include\winsock2.h(98) : see declaration of 'SOCKET'
c:\documents and settings\tex\bureaublad\wsa2.c(22) : error C2146: syntax error : missing ';' before identifier 'mijnsocket'
c:\documents and settings\tex\bureaublad\wsa2.c(22) : error C2065: 'mijnsocket' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(25) : warning C4244: '=' : conversion from 'SOCKET' to 'int', possible loss of data
c:\documents and settings\tex\bureaublad\wsa2.c(27) : error C2065: 'socketresultaat' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(31) : error C2143: syntax error : missing ';' before 'type'
c:\documents and settings\tex\bureaublad\wsa2.c(34) : error C2065: 'gegevens' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(34) : error C2224: left of '.sin_family' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(35) : error C2224: left of '.sin_port' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(36) : error C2224: left of '.sin_addr' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(37) : error C2224: left of '.sin_zero' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(37) : error C2198: 'memset' : too few arguments for call
c:\documents and settings\tex\bureaublad\wsa2.c(40) : error C2143: syntax error : missing ';' before 'type'
c:\documents and settings\tex\bureaublad\wsa2.c(42) : error C2065: 'bindresultaat' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(51) : warning C4047: 'function' : 'int *' differs in levels of indirection from 'size_t'
c:\documents and settings\tex\bureaublad\wsa2.c(51) : warning C4024: 'accept' : different types for formal and actual parameter 3

Thanks for your help.

Regards,

Ben

**matsp** · 03-09-2008

I _think_ you should move this line down to below your variable declarations:

Code:

          versie = MAKEWORD ( 2, 2);

In standard C, it's not legal to mix code and variable declarations. The above line of code is not a variable declaration, so should be after the declarations.

I could be wrong.

--
Mats

**daYz** · 03-09-2008

Thanks matsp,

That got rid of most of the erros. I have to place

Code:

SOCKET mijnsocket;

at the variable declarations also. I also had to change

Code:

if ( socketresultaat == INVALID_SOCKET){

to

Code:

if (  mijnsocket == INVALID_SOCKET){

I now get the following errors.

Code:

c:\documents and settings\tex\bureaublad\wsa2.c(32) : error C2143: syntax error : missing ';' before 'type'
c:\documents and settings\tex\bureaublad\wsa2.c(35) : error C2065: 'gegevens' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(35) : error C2224: left of '.sin_family' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(36) : error C2224: left of '.sin_port' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(37) : error C2224: left of '.sin_addr' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(38) : error C2224: left of '.sin_zero' must have struct/union type
c:\documents and settings\tex\bureaublad\wsa2.c(38) : error C2198: 'memset' : too few arguments for call
c:\documents and settings\tex\bureaublad\wsa2.c(41) : error C2143: syntax error : missing ';' before 'type'
c:\documents and settings\tex\bureaublad\wsa2.c(43) : error C2065: 'bindresultaat' : undeclared identifier
c:\documents and settings\tex\bureaublad\wsa2.c(52) : warning C4047: 'function' : 'int *' differs in levels of indirection from 'size_t'
c:\documents and settings\tex\bureaublad\wsa2.c(52) : warning C4024: 'accept' : different types for formal and actual parameter 3

**vart** · 03-09-2008

or make it one line initialization
instead of

Code:

WORD versie;
          versie = MAKEWORD ( 2, 2);

use

Code:

WORD versie = MAKEWORD ( 2, 2);

**vart** · 03-09-2008

I now get the following errors.

And what is the current code?

**daYz** · 03-09-2008

Ok thanks

The current code is:

Code:

#include <winsock2.h>
#include <windows.h>
#include <stdio.h>



int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
    {
         
          WORD versie;
          SOCKET mijnsocket;
          WSADATA wsaData;
          int resultaat;
          
		  versie = MAKEWORD ( 2, 2);
          resultaat = WSAStartup(versie, &wsaData);
          
          if ( resultaat != 0 ){
               printf("WSAStartup error");
               }
          
         

          
          mijnsocket = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
          
          if ( mijnsocket == INVALID_SOCKET){
               printf("WSASocket errror");
               }
               
          struct sockaddr_in gegevens;
          
          
		  gegevens.sin_family = AF_INET;
          gegevens.sin_port = htons(7777);
          gegevens.sin_addr.s_addr = inet_addr("127.0.0.1");
          memset(&(gegevens.sin_zero), '\0', 8);
  
          
		  int bindresultaat;        
          
		  bindresultaat = bind( mijnsocket, (struct sockaddr *) &gegevens, sizeof( struct sockaddr_in ) );
          
		  if (bindresultaat == SOCKET_ERROR ){
                            printf("Bind error");
                            }
          
		  listen(mijnsocket, 1);

                     
          accept(mijnsocket, (struct sockaddr *)&gegevens, sizeof(struct sockaddr_in));

          return 0;
          
          }

**vart** · 03-09-2008

These

struct sockaddr_in gegevens;
int bindresultaat;

also are declarations - that should be at the beginning of the block

**xuftugulus** · 03-09-2008

Code:

    struct sockaddr_in gegevens;
...
    int bindresultaat;

Try moving that to the top also along with the other variable declarations.

**daYz** · 03-09-2008

Thank you very much guys

If you could help me with the last errror messages that would be really great.

The following error messages seem to be related to:

Code:

accept(mijnsocket, (struct sockaddr *)&gegevens, sizeof(struct sockaddr_in));

Code:

c:\documents and settings\tex\bureaublad\wsa2.c(54) : warning C4047: 'function' : 'int *' differs in levels of indirection from 'size_t'
c:\documents and settings\tex\bureaublad\wsa2.c(54) : warning C4024: 'accept' : different types for formal and actual parameter 3
Linking...
MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
C:\Documents and Settings\Tex\Bureaublad\ziek\WSA\Debug\WSA.exe : fatal error LNK1120: 1 unresolved externals

**vart** · 03-09-2008

third parameter should be NULL or pointer to the var that will receive the actual lenght of the address

The integer referred to by addrlen initially contains the amount of space pointed to by addr. On return it will contain the actual length in bytes of the address returned.

so it should be like

Code:

int sockadrlen = (int)sizeof(struct sockaddr_in);
accept(mijnsocket, (struct sockaddr *)&gegevens, &sockadrlen );

**daYz** · 03-09-2008

Thanks vart

That does the job indeed.

Thread: Cannot compile a C program in Visual C++ Express

Thread Tools

Search Thread

Display

Cannot compile a C program in Visual C++ Express

Similar Threads

Avoiding Global variables

more then 100errors in header

C++ std routines

MS Visual C++ 6 wont include vector.h in a header file

odd errors from msvc std library files