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标题:[求助]出现这个问题 error: incompatible types in assignment
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c199163
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[求助]出现这个问题 error: incompatible types in assignment
我在做一个HTTP SERVER
上代码
/*
*    Program:    server_web120.c
*   Author:        Paul Girard Ph.D., DIM, UQAC
*   Date:        Sept 2012
*    Version:         1.2
*
*   Objective:    This basic web program supports http 1.0 and 1.1 :        
*               - GET method from a client commercial web navigator
*                - validates the request GET for error codes 400 and 404
*                - and generates a response following http protocol rules
*                (code 200).  html pages are coded in the program source.
*
*            This version doesn't support access to external files.
*            Most http client header parameters are ignored :
*            (User_Agent, From, Referer, Connection, Accept, ...)
*
*    Compilation and link options : (Solaris)         
*        gcc server_web120.c -lsocket -lnsl -o server_web120 or
*
*        gcc server_web120.c -lsocket -lnsl -w -o server_web120
*                        to suppress "warnings"

    Compilation and link options : (Linux)         
*        gcc server_web120.c -lnsl -o server_web120 or
*
*        gcc server_web120.c -lnsl -w -o server_web120
*                        to suppress "warnings"
*
*   Execution: 2 formal parameters to run the server :
*                         server_name and port #
*                dimensxcn1% server_web120 port#
*                (note: port 80 is assigned to a commercial http server
*        ex.     dimenszxcn1% server_web120 5001
*
*        The following html pages are coded directly in the source
*        : HOME_PAGE and TIME. They can be called  
*        like this by a telnet client or a web client navigator
*
*        1. with a telnet client using http 1.0 protocol:
*             telnet sunense.uqac.ca  port#    (no_port: port # used)
*            GET / HTTP/1.0         to get HOME_PAGE and an empty
*            cr/lf            line to terminate the request
*             telnet sunense.uqac.ca  port#
*            GET /time HTTP/1.0    to get TIME
*            cr/lf
*
*        2. with telnet using HTTP/1.1 protocol and Apache:
*             telnet sunense.uqac.ca 80
*            GET / HTTP/1.1
*            Host: dimensxcn1.uqac.ca
*            cr/lf
*             telnet dimensxcn1.uqac.ca  80
*            Host: dimensxcn1.uqac.ca
*            GET /time HTTP/1.1
*            Host: dimensxcn1.uqac.ca
*            cr/lf
*
*        3. with Netscape or Explorer client
*            http://dimensxcn1.uqac.ca :no_port            to get Home_Page
*            http://dimensxcn1.uqac.ca :no_port/time        to get time
*/

/*
*       Files to include
*/

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/stat.h>

#define BUFFSIZE    256
#define SERVER_NAME    "Mini web server  V1.0 (Paul Girard, Ph.D., UQAC)"

#define ERROR_400    "<head></head><body><html><h1>Error 400</h1><p>Th\e server couldn't understand your request.</html></body>\n"

#define ERROR_404    "<head></head><body><html><h1>Error 404</h1><p>Do\cument not found.</html></body>\n"

/*#define HOME_PAGE    "<head></head><body><html><h1>Welcome to the mini \
web server PG_web</h1><p>Let me invite you to visit : <ul><li><a href=\
\"http:\\wwwens.uqac.ca/~pgirard\"><font color=\"#0000ff\"> my personal \
site</font></a></li></ul></html></body>\n"*/

#define TIME_PAGE    "<head></head><body><html><h1>The actual date is : \<br><br>%s</h1></html></body>\n"

int    recvln(int, char *, int);        /* read a client http line  */
void send_header(int, int, int,int);      /* send a http header to client*/
int    wait_connection(short);            /* wait for a client connection */
void send_eof(int);                    /* close a client connection */


int    init = 0;                        /* initialization */
int    sock;                            /* socket */
int stat(const char *path,struct stat *buf);

/* ***************************************************************************
*    Main Program
*  ***************************************************************************
*/

int main(int argc, char *argv[])     /* argv[0] pointer to program name
                                    argv[1] pointer to port number */
{
    char filename[]="../res00040/document/image.jpg";
    FILE *fptr;
    int rval;
    char *p,*q;
    char string[20];
    struct stat buf;
    char *ptr;
    char *drr;
    char *end;

    int        conn;        /* socket descriptor */
    int        n;
    char    buff[BUFFSIZE], cmd[16], path[64], vers[16];
    char    *timestr;
    struct timeval    tv;        /* delay in sec since 1/1/1970 */
    time_t a;            /* function time */
    if (argc != 2)
    {
        fprintf(stderr, "usage : %s <no_port_TCP>\n", argv[0]);
        return 1;
    }

    while(1)
    {

/*         Wait for a client connection on the known port # */

        conn = wait_connection(atoi(argv[1]));
        if (conn < 0) return 1;

/*         Reads & validates the request client */

        n = recvln(conn, buff, BUFFSIZE);
        sscanf(buff, "%s %s %s", cmd, path, vers);
        printf("Client connection\n");
        printf("Request type : %s \tpath : %s \tvers : %s\n",cmd, path, vers);

/*         Ignore other client header parameters until \r\n on a line */

        while((n = recvln(conn, buff, BUFFSIZE)) > 0)
        {
            if (n == 2 && buff[0] == '\r' && buff[1] == '\n')
                break;
        }

/*         Check if there is an unexpected EOF */

        if (n < 1)
        {
            send_eof(conn);
            continue;
        }
        
/*         Validates the http client request  */
        
        if (strcmp(cmd, "GET") != 0 &&
            (strcmp(vers, "HTTP/1.0") != 0 ||
             strcmp(vers, "HTTP/1.1") != 0))
        {        
            send_header(conn, 400, strlen(ERROR_400),0);
            send(conn, ERROR_400, strlen(ERROR_400),0);
            send_eof(conn);
            continue;
        }

/*         Transmit back the requested html page or
*        the message "not found" error */

        if (strcmp(path, "/index.html") == 0)         /* HOME_PAGE by default*/
        {        
            strcpy(filename, "index.html");
    //        filename="index.html";
              if(stat(filename, &buf) != 0)
                         exit(0);
            printf("filename: %s\n", filename);
            send_header(conn, 200, strlen(filename),0);
            if((fptr=fopen(filename,"r"))==NULL)
            {
                perror("error opening this file");
                exit(0);
            }
            while(fgets(buff,256,fptr))
            {
                send(conn, buff, strlen(buff),0);
            }
            fclose(fptr);
        }
        else if (strcmp(path, "/document/image.jpg") == 0 || strcmp(path, "/document/image.jpeg") == 0)
        {   
        
            filename = strrchr(path, '/document/image.jpg') ;
            end=".jpg";
            drr= strrchr(path, '.');
            strcpy(drr,end);
              if(stat(filename, &buf) != 0)
                         exit(0);
            printf("File size:%d octets",buf.st_size);
            printf("filename: %s\n", filename);
            send_header(conn, 200, buf.st_size,0);
            if((fptr=fopen(filename,"r"))==NULL)
            { perror("error opening this file");
              exit(0);}
             while(feof(fptr)==0){
                 rval=fread(buff,sizeof(char),256,fptr);
                 if(rval>0)
                     send(conn, buff, rval,0);
             }
             fclose(fptr);
        }   
              else if (strcmp(path, "/document/image.gif") == 0)
        {   
            filename =(strrchr(path, '/') + 1);         
            end=".gif";
            drr= strrchr(path, '.');
            strcpy(drr,end);
              if(stat(filename, &buf) != 0)
                         exit(0);
            printf("File size:%d octets",buf.st_size);
            printf("filename: %s\n", filename);
            send_header(conn, 200, buf.st_size,1);
            if((fptr=fopen(filename,"r"))==NULL)
            { perror("error opening this file");
              exit(0);}
             while(feof(fptr)==0){
                 rval=fread(buff,sizeof(char),256,fptr);
                 if(rval>0)
                     send(conn, buff, rval,0);
             }
             fclose(fptr);
        
        }
            else if (strcmp(path, "/page1.html") == 0 )
        {            
                filename = (strrchr(path, '/') + 1);
              if(stat(filename, &buf) != 0)
                         exit(0);
            printf("filename: %s\n", filename);
            send_header(conn, 200, strlen(filename),2);
            if((fptr=fopen(filename,"r"))==NULL)
            { perror("error opening this file");
              exit(0);}
             while(fgets(buff,256,fptr))
                 {
              send(conn, buff, strlen(buff),0);
             }
             puts(buff);
             fclose(fptr);
        }
      
               
        else if (strcmp(path, "/time") == 0)     /* time page */
             {
            /*    Solaris ==>        if (gettimeofday(&tv, NULL) == -1)
                    puts("Error with gettimeofday()");
                    timestr = ctime(&tv.tv_sec);    */

            /* testtime.c: test of time function*/
                if (gettimeofday(&tv, NULL) == -1)
                puts("Error with gettimeofday()");
                timestr = ctime(&a);    /* formatted date-time */   
                sprintf(buff, TIME_PAGE, timestr);
                send_header(conn, 200, strlen(buff),0);
                send(conn, buff, strlen(buff), 0);
            }
            else if(!(drr= strrchr(path, '.')))         
            //then we will add default extention name ".html",
                                                                   {               
            filename = (strcat(path, ".html")+1);//这里有问题,不知道怎么改~求帮助
              if(stat(filename, &buf) != 0)
                         exit(0);
            printf("filename: %s\n", filename);
            send_header(conn, 200, strlen(filename),0);
            if((fptr=fopen(filename,"r"))==NULL)
            { perror("error opening this file");
              exit(0);}
             while(fgets(buff,256,fptr)){
              send(conn, buff, strlen(buff),0);
             }
             puts(buff);
             fclose(fptr);}
            else
               {         /* Error not found */
                /*send_header(conn, 404, strlen(ERROR_404));
                send(conn, ERROR_404, strlen(ERROR_404),0);*/
                if((fptr=fopen(filename,"r"))==NULL)
                   {
                    perror("error opening this file");
                    exit(0);
                   }
                   if(stat(filename,&buf))
                    send_header(conn,200,buf.st_size,0);
               }
               
        send_eof(conn);            /* close the client socket */
    }    /* end of infinite loop */
}        /* ==== end of main program */

/* *************************************************************************
*    Function wait_connection() returns a client connection
*  *************************************************************************
*/

int wait_connection(short no_port)
{
    struct sockaddr_in sockaddr;    /* internet format */
    int newsock;        /* socket descriptor */
    size_t length;        /* #octets in sockadr_in structure*/

/*
*     Tcp socket creation
*/

    switch (init)
    {
    case 0 :
            sock = socket(AF_INET, SOCK_STREAM, 0);
            if (sock < 0)
              {
                    perror("Error in socket creation");
                    return 1;
              }

/*
*        2. Specify the local part of the address :
*        1)the local port number in network format and
*        2)the local IP address.  INADDR_ANY is used on a server
*        because many ip addresses may be used on the same machine.
*/
            sockaddr.sin_family = AF_INET;
            sockaddr.sin_addr.s_addr = INADDR_ANY;
            sockaddr.sin_port = htons(no_port);
        
            if (bind(sock, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) < 0)
              {
                  perror("The bind socket did not work");
                 close(sock);
                 return 1;
              }

/*
*        Simple validation: find the name associated to this socket
*          and print its port number
*/
            length = sizeof(sockaddr);
            if (getsockname(sock, (struct sockaddr *)&sockaddr, &length ) < 0 )
              {
                    perror("Error in getsockname()");
                    exit(1);
              }
            printf("The socket tcp port # is  #%d\n", ntohs(sockaddr.sin_port));

/*
*        Fix the maximum number of clients waiting connection and
*        leave the server in passive mode
*/   
            listen(sock, 5);
            puts("Server ready for client connection");
            init = 1;    /* end of initialization */
   
    case 1:     /* after initialization continue here */
            newsock = accept(sock, (struct sockaddr *) 0, (size_t *) 0);
            return newsock;
    }
}
/* ==== End of wait_connection ================================================ */




/* *************************************************************************
*    Function recvlin() reading a socket connection with recv()
*    until newline (\n) or EOF is read. A flush of the remaining characters
*    is done until newline or EOF if the buffer is full. It returns a full
*    buffer.
*
*    conn: socket # (input)
*    *buff: address of the buffer receiving a complete line (input)
*    buffsz: buffer size in octets (input)
*   ==>    recvln returns the length in octets of read characters in buff
* **************************************************************************
*/

int recvln(int conn, char *buff, int buffsz)
{   
    char    *bp = buff, c;
    int    n;            /* #octets read by recv() */

/*      While buffer not full and we can read characters
*       different from \n, octets are saved in buff
*/
    while (bp - buff < buffsz &&
          (n = recv(conn, bp, 1, 0)) > 0)
    {
        if (*bp++ == '\n') return (bp - buff);
    }

    if (n < 0)        /* read has failed */
        return -1;
        
/*     If the buffer is full, ignore the rest until \n */
    if (bp - buff == buffsz)
        while (recv(conn, &c, 1, 0) > 0 && c != '\n');
    return (bp - buff);
}

/* ==== End de recvln ====================================================== */




/* *************************************************************************
*     Function send_header() sending the http 1.0 header to client  
*    with the status, server name, content type and content length
*  *************************************************************************
*/
 
void send_header(int conn, int stat, int len,int i)
{
    char    *statstr, buff[BUFFSIZE];

/*     change the status code to a character string message */

    switch(stat)
    {
    case 200:
        statstr = "OK";
        break;
    case 400:
        statstr = "Bad Request";
        break;
    case 404:
        statstr = "Not Found";
        break;
    default:
        statstr = "Unknown";
        break;
    }
   
/*
*     send the parameter server header
*    "HTTP/1.0 Server Content-Length Content-Type" to client
*/

    sprintf(buff, "HTTP/1.0 %d %s\r\n", stat, statstr);
    send(conn, buff, strlen(buff), 0);

    sprintf(buff, "Server: %s\r\n", SERVER_NAME);
    send(conn, buff, strlen(buff), 0);

    sprintf(buff, "Content-Length: %d\r\n", len);
    send(conn, buff, strlen(buff), 0);
switch(i)
    {
case 0:
    sprintf(buff, "Content-Type: text/html\r\n");
    send(conn, buff, strlen(buff), 0);break;
case 1:
    sprintf(buff, "Content-Type: image/jpg\r\n");
    send(conn, buff, strlen(buff), 0);break;
case 2:
    sprintf(buff, "Content-Type: image/gif\r\n");
    send(conn, buff, strlen(buff), 0);break;
    }
   
    sprintf(buff, "\r\n");
    send(conn, buff, strlen(buff), 0);
}   
/* ===================== end of send_header ================================ */



/* ****************************************************************************
*     Function send_eof() closes the connection from this end
*    by using a shutdown() call which shuts down all or part of a full-duplex
*    connection on the associated socket .
*       0 :     further receives will be disallowed,
*        l :      further sends will be disallowed (this mode is used),
*        2:     further sends and receives will be disallowed
* *****************************************************************************
*/

void send_eof(int conn)
{   
    printf("End of client connection\n");
    shutdown(conn,1);
    return;                        
}

/*===================== end of send_eof =================================== */
总是提示filename =(strrchr(path, '/') + 1);有错误,错误提示incompatible types in assignment
求指教


[ 本帖最后由 c199163 于 2013-10-10 20:53 编辑 ]
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2013-10-10 20:07
c199163
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顶一个先,求帮助。。。愁死我了,怎么查也查不出来。。。。
2013-10-10 20:56
zhaogay
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filename是个数组,怎么可以给他直接赋值

好好学习,天天想上
2013-10-10 21:33
c199163
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回复 3楼 zhaogay
额。。。那怎么改合适些?求指教
2013-10-10 21:39
zhaogay
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回复 4楼 c199163
具体逻辑没细看,就赋值的话strcpy,memcpy之类的就可以了

好好学习,天天想上
2013-10-10 21:44
c199163
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回复 5楼 zhaogay
strcpy(filename, strrchr(path, '/document/image.jpg'))这样可以么?

2013-10-10 21:52
zhaogay
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回复 6楼 c199163
建议还是把strrchr返回值放到中间变量里,不然有时候会崩掉

好好学习,天天想上
2013-10-10 21:56
c199163
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回复 7楼 zhaogay
求指导~~~
2013-10-10 22:09
快速回复:[求助]出现这个问题 error: incompatible types in assignment
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