帮忙看看问题(页 1) - C/C++ (STL/boost) - Linux伊甸园论坛

zonewone 发表于 2008-4-25 15:44

帮忙看看问题

我写的一个设想头采集数据经过网络收发的程序。!{_kU!_]$i
c6@T%Y2e"L
/* main 函数  */ eovFr(Gm
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>/s+Q8p g&il#q
#include <netinet/in.h>8Mw5h+["U:`2t]b
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <sys/types.h>*Sg*vtY1D"H(wF
7c7XZr$N)PGGm

#include "video.h"/[ lr1F*WXGY
#include "main.h"G2~,b;@S3v+z
#include "getpic.h"D'pU}%d)Z!Y;k8T
+Eu UTJy-}6mD
#define MAXBUF (1024*20)

int main(int argc, char **argv)
{-IrA+MM.hF;n"c
int sockfd, new_fd;
socklen_t len;
struct sockaddr_in my_addr, their_addr;

unsigned int myport, lisnum;

FILE *fp;  /* target file */$z U"eo4Z,DV}
char* filename = "grab.jpeg"; bM v/zUdA

char *buf = NULL;}fnH/SH_
int file_size = 0;:?0C,B8sjN7Zj%n

fd_set rfds;

struct timeval tv;%_9NDQ8@"G9[.]/n*Z(JE
int retval, maxfd = -1;
Gz D,h.fPx$I
if (argv[1]) FM({I%stQCO
myport = atoi(argv[1]);
elseJ+ZtRf9DP }
myport = SERVER_PORT;
B*h3Wd,L,T N`
if (argv[2]) ^2^%G?E"la
lisnum = atoi(argv[2]);
else
lisnum = LENGTH_OF_LISTEN_QUEUE;
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)3c\_K\GKME;Fy^
{
perror("socket");
exit(1);
}
bzero(&my_addr, sizeof(my_addr));)C%|a NlJ3`lhn
my_addr.sin_family = PF_INET;
my_addr.sin_port = htons(myport);B!CCe"?BK$I

if (argv[3])#~B'elh
my_addr.sin_addr.s_addr = inet_addr(argv[3]);
else
my_addr.sin_addr.s_addr = INADDR_ANY;&AZb!B"k{f+g4_!yts

if (bind(sockfd, (struct sockaddr *) &my_addr, \
sizeof(struct sockaddr)) == -1)
{
perror("bind");]/CIi"egp
exit(1);Q1R5S/X+\(qOe;eL
}"i`0rT!}^!m+SE
if (listen(sockfd, lisnum) == -1)8I M~ I"H4~z
{
perror("listen");
exit(1);
}

while (1)
{
        printf("\n--Wating for connecte!--颅\n");
len = sizeof(struct sockaddr);QVd$u6^ ]3gX
if ((new_fd = accept(sockfd, \DlB0V*j0u
(struct sockaddr *)&their_addr, &len)) == -1)
{
perror("accept");'qi#^wzjr
exit(errno);
}else{
printf("server: got connection from %s, \fd0q3VIo!wSj
port %d, socket %d\n",\
inet_ntoa(their_addr.sin_addr),\
ntohs(their_addr.sin_port), new_fd);
}Y a&Kb$usnV
while(1)
{

get_pic(); //问题就出在这里LMN&O"[)N

if ((fp = fopen(filename, "r+b")) == NULL)
{dPg$n/Kb
perror("open");
exit(1);
}
fseek(fp, 0, SEEK_END);
file_size = ftell(fp);
buf = (char*)malloc((int)(file_size+2));
memset(buf, 0, file_size+2);/Ev}"H~
fseek(fp, -(file_size), SEEK_END);R^+yQ`*]\'v
fread(buf, file_size, 1, fp);/`P1FV Z(j \;oa
len = send(new_fd, buf, \
file_size, 0);
if (len > 0)
{.At2rM b u4[q
printf("Sending %s, length %d\n", buf, len);
}else{
printf("%s,%s'\n", buf, \
errno, strerror(errno));
break;/u#x%p+_;Gp:xp
}t/a'r$pZu

fclose(fp);
}

close(new_fd);
}
H,RU4Z$y;d\
close(sockfd);KCqt%a"k+m
"V0F{U?9D5P
return 0;b;}Vj$B
}z4qQ{W9r

%M^J'n:eZj
/*getpic*/$jL*f9gG)wR7G\)A
int get_pic(void)
{
v4l_device *vd;@&r~.k{,M
char *image_ptr;"d4sQpvh U
// printf("open v4l\n");
%s$H;g!?{no9a+x
v4l_open(vd);!Fd'c @|$j0}6B^
v4l_mmap(vd);
// img = (char *)v4l_open(vd);*G`} S!nq9JM
image_ptr = (char *)v4l_get_data(vd);J:q"o"]5l+|wk J
rgb_to_jpeg(JPEG_NAME, (unsigned char *)image_ptr, 20, 0);

v4l_ummap(vd);2P@4No*Db_S
v4l_close(vd);
return 0;
9K.hw V5|+@*Q
}fpUk-po O
tz"Fw2FL.K8j
如果按照上面那种方式就是对的。%rg@%zM/m#a
但是如果写成下面这样的：用gdb调试发现在v4l_open()这个函数这里提示：段错误。为什么呢？

int main(int argc, char **argv)xO+@NvW7K:j
{
int sockfd, new_fd;
socklen_t len;k PP Y9w
struct sockaddr_in my_addr, their_addr;
r O|ij
unsigned int myport, lisnum;
yF ^j f^;X)u
FILE *fp;  /* target file */&o@Dp"T9ja
char* filename = "grab.jpeg"; #Us$zw"_kM5uA"}7na
h;Y!VU._*P+}
char *buf = NULL;uF~"j0mP
int file_size = 0;

fd_set rfds;
+z4S%]:]k-?
struct timeval tv;
int retval, maxfd = -1;^s5Ft:~T&B
if (argv[1])EN9kR\qK'q
myport = atoi(argv[1]);
elsesD|h*?j
myport = SERVER_PORT;)UbZ)p3PT`

if (argv[2])~[w X:e3{(?If
lisnum = atoi(argv[2]);
else
lisnum = LENGTH_OF_LISTEN_QUEUE;
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)C#X#cA,j-@e$`
{Y:t4F[$Ws)acR
perror("socket");
exit(1);yZ_:af;p\m(G
}Z]frbZ8Y
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = PF_INET;,_:B8? t ~ I@kC
my_addr.sin_port = htons(myport);y@;e1ya\)p e^

if (argv[3])3TY:e8nlJ a
my_addr.sin_addr.s_addr = inet_addr(argv[3]);
else
my_addr.sin_addr.s_addr = INADDR_ANY;
if (bind(sockfd, (struct sockaddr *) &my_addr, \@1nNF-De X c
sizeof(struct sockaddr)) == -1)
{ %E$w]@&o'n
perror("bind");9tdv{:sY
exit(1);5B#A~|9V#\)V*G@&p
}H*|[8I{#\P&J!t
if (listen(sockfd, lisnum) == -1)
{
perror("listen");
exit(1);k JJ8U_(OV1H
}YA#}D'pOvw
!@ RA0p:g_
v4l_open(vd); //

while (1)
{nnisFl
        printf("\n--Wating for connecte!--颅\n");6G(X y7AYy;_fiE
len = sizeof(struct sockaddr);a _H,\PG
if ((new_fd = accept(sockfd, \Gv9[K&Wb {9J&H}
(struct sockaddr *)&their_addr, &len)) == -1)&b'p%U xF h!G6@
{ H5T9L%S$G?j b_(u
perror("accept");
exit(errno);
}else{y hyqdV'bZGide
printf("server: got connection from %s, \
port %d, socket %d\n",\
inet_ntoa(their_addr.sin_addr),\
ntohs(their_addr.sin_port), new_fd);
} Gd*X(Y Z
while(1)
{
v4l_mmap(vd);  //  不同之处*Xh,e:Ct]
image_ptr = (char *)v4l_get_data(vd);  //修改
rgb_to_jpeg(JPEG_NAME, (unsigned char *)image_ptr, 20, 0); //修改&R$\;e#c6N\1h
j1hQgH6L
if ((fp = fopen(filename, "r+b")) == NULL)8aiD@2q*X+r{
{%]QiW']"ku0u
perror("open");
exit(1);
}
fseek(fp, 0, SEEK_END);
file_size = ftell(fp);(G|*^'iCwvBdY
buf = (char*)malloc((int)(file_size+2));rk|HJ(?2H4W
memset(buf, 0, file_size+2); ul^8WJ(M
fseek(fp, -(file_size), SEEK_END);Pd0}/HMr
fread(buf, file_size, 1, fp);W$f5zA:]"_DK{
len = send(new_fd, buf, \#tT6HH\r"f
file_size, 0);1H&y$^(A-wA8Y1WET
if (len > 0)
{Te\j%N5I9X
printf("Sending %s, length %d\n", buf, len);
}else{
printf("%s,%s'\n", buf, \
errno, strerror(errno));
break;+Z5`x1{8IJ
}!L,G@#t`Zti

fclose(fp);
v4l_ummap(vd); //修改6h*p6TIa
}'r1[Q+h};o*M
   ~0VJ)e"d T
close(new_fd);7P*K3tQk%D` dZR

}
v4l_close(vd); //修改
close(sockfd);
!hm'l D0[ kL
return 0;
}

/*v4l的几个函数的定义在此*/

char *v4l_get_address(v4l_device *vd)(]NP|X}#u
{ oe%wR)P(l
return (vd->map + vd->mbuf.offsets[vd->frame_current]);
}
~s3{;kl/|
int v4l_open(v4l_device *vd)^`"U:W&O]tw
{
//open device
if ((vd->fd = open(VD_NAME, O_RDWR)) < 0)
{ j$c&Wv])b.F4~
perror("v4l_open");W+F{ [hg
return ERR_VIDEO_OPEN;
}Mh Gzuz.pJl

//get capability
if (ioctl(vd->fd, VIDIOCGCAP, &(vd->capability)) == -1)!Lw&a#G.|%B+P[
{5P0QC{Pk
perror("v4l open : VIDOCGCAP");w_fP'oX8g
// return ERR_VIDEO_GCAP;+t:Kt][9n
}Q#w,i T A,I4~RA
if ((vd->capability.type & VID_TYPE_CAPTURE) == 0)
{+d6KT1b?i[4u
perror("v4l open :VID_TYPE_CAPTURE");3nmI#M5`,t'aD&x
// return ERR_VID_TYPE_CAP;
}
\1f6|"K,GB4m*h.`
printf("capability.name: %s\n", vd->capability.name);
printf("Type:%d\n", vd->capability.type);F7|:n"wnb4eK&k/e
L B2d~F)ODl;]2?
if(debug){
printf("Maxwidth:%d, Maxheight:%d\n",  \
vd->capability.maxwidth, vd->capability.maxheight);
printf("Minwidth:%d, Minheight:%d\n", \
vd->capability.minwidth, vd->capability.minheight);}
&yX|Ri{lz?4y"MG
Wp}S\f
//get picture~(jNgj!x7e
if (ioctl(vd->fd, VIDIOCGPICT, &(vd->picture)) < 0)Y|qP9S4ywz
{O%i,o K7R#j C
perror("v4l get picture: VIDIOCGPICT");Xmb y;LQ
return ERR_VIDEO_GPIC;!GW+~N at(['Ry
}
if(debug)
{ W/kXlBKj*e
printf("picture.palette : %d ", vd->picture.palette);
printf("picture.depth: %d\n", vd->picture.depth);C]?4|x/[8C
}
|0o6qru7I8?8_e
//set picture
vd->picture.depth = DEFULT_DEPTH;
vd->picture.palette = DEFULT_PAL;p9W#e"X-zzd/v
if (ioctl(vd->fd, VIDIOCSPICT, &(vd->picture)) < 0)
{3Gw p}7p^"@B
perror("v4l set picture: VIDIOCSPICT"); f}"NF dv
// return ERR_VIDEO_SPIC;
}
if (ioctl(vd->fd, VIDIOCGPICT, &(vd->picture)) < 0)
{
perror("v4l get picture: VIDIOCGPICT");-s$d K~?NdeY+Wo
return ERR_VIDEO_GPIC;Z2a7DA z?c
}
if(debug){"dBjPfb}9GV
printf("picture.palette : %d ", vd->picture.palette);$Iad!AK*u h H9^
printf("picture.depth: %d\n", vd->picture.depth);}

JX3bF)xka
//get channels
int m = 0;y'p'weGfm$h
for(m = 0; m < vd->capability.channels; m++)
{
vd->channel[m].channel = m; k?P:kO d

if(ioctl(vd->fd, VIDIOCGCHAN, \p6L5V_t Jl
&(vd->channel[m])) < 0)||+VEH7|R&wd:x~
{i[ik.b+c0k\
perror("v4l get channels: VIDIOCGCHAN");M\;c]sZ
return ERR_VIDEO_GCHAN;yZ)vf.x#BB
}
vd->channel[m].norm = VIDEO_MODE_NTSC;"F:q$vymP7R#_
dDT-`HKpo
if(ioctl(vd->fd, VIDIOCSCHAN, &(vd->channel[m])) < 0)
{-}*L4n g$L)W
perror("vel get channels: VIDIOCSCHAN");
return ERR_VIDEO_SCHAN;$E7cx:y:I8Gzs)Q S
}
Zon[.hT
}5|h#r;yp{L*[O-z
if(debug)"|-w6r{Z
printf("Channels:%d, ", vd->capability.channels+1);!Olj,f-}Y

//mmap_init]%r7q(Job5L
vd->mmap.width = IMGWIDTH;
vd->mmap.height = IMGHEIGHT;5zBNsq9ho~2k
vd->mmap.format = vd->picture.palette;
vd->frame_current = 0;
vd->frame_using[0] = vd->frame_using[1] = 0;

//get buffer
if(ioctl(vd->fd, VIDIOCGFBUF, &(vd->buffer)) < 0),^~0X2K6`,^T
{
perror("v4l get mbuf: VIDIOCGFBUF");5h ~/N*X0^wA
return ERR_GET_BUF;qfj4H^o;Z
}jx#IG#l2O3]
// printf("buffer.height: %d ", vd->buffer.height);s8Fc9~(tQg
// printf("buffer.width: %d\n", vd->buffer.width);

return 0;8T-D!I.a4MGZ2\ M
}

int v4l_mmap(v4l_device *vd)4MX%PZ3].\P
{}Y0V)_ eV0YW*GlF

///mmap_init
if (ioctl(vd->fd, VIDIOCGMBUF, &(vd->mbuf)) < 0)#G:t.towbD%Ah,f%r
{-l$v]mx:O
perror("v4l get mbuf: VIDIOCGMBUF");!^8q&j5r-feC{`
return ERR_GET_BUF;*M"X$|1q6u
}
if(debug)
        printf(" Pic Size:%d\n", vd->mbuf.size);

if ((vd->map = (char*)mmap(0, vd->mbuf.size, \+|&yl6E`F
PROT_READ|PROT_WRITE, MAP_SHARED, vd->fd, 0)) < 0)h7z g8I`*o3uT @,H
{#H;e!C]@[;D8q8Ol
perror("v4l mmap : map");
return ERR_MAP_SHARED;t]:Jru,e
}
W?6~)_5qw(q?(Q
return 0;$uZlz l;}5j&L1EczR
}o U}xo,m@7?
7W{uWI#[y2E
int v4l_get_data(v4l_device *vd)
{
char *img_tmp;$LD J;c:G0b+Sls;Y
(U^8S4n6V4hb
//grab frame$W]L:Yl3kwY
struct timeval tpstart,tpend;(je@*a0sZV:P5Z3VR
float timeuse;
gettimeofday(&tpstart,NULL);

vd->mmap.frame = 0;
if (ioctl(vd->fd, VIDIOCMCAPTURE, &(vd->mmap)) == -1 )
{

perror("v4l grab start : VIDIOCMCAPTURE");{*?`o.z!?Lm$v
return ERR_MCAPT;G$h%wl GV?*M8~
}
vd->frame_using[0] = 1, vd->frame_current = 0;+wv'Y)Ry'rG0l
!uy3w8y`o;N rL],@
S8H.u$|^?
gettimeofday(&tpend,NULL);h9]l/ZPxv
timeuse=1000000*(tpend.tv_sec-tpstart.tv_sec) + \
tpend.tv_usec-tpstart.tv_usec;
timeuse/=1000000;-\"z(SGfoRo)j?
if(debug) C4J LgVh7zk
printf("timeuse: %f\n", timeuse);3B4P%m+I!D

//grab sync5r.}2dY\(vKG
gettimeofday(&tpstart,NULL);mk u}\#m)q3k
if (ioctl(vd->fd, VIDIOCSYNC, &(vd->frame_current)) < 0)'y? @%|H
{
perror("v4l suyc: VIDIOCSYNC");
return ERR_SYNC;
}
vd->frame_using[vd->frame_current] = 0;
/AHp*}-K/f

//9M0w*i V"su u#`
gettimeofday(&tpend,NULL);
timeuse=1000000*(tpend.tv_sec-tpstart.tv_sec) + \$};V%iNwW4[`t
tpend.tv_usec-tpstart.tv_usec;)S^yx)^0xe?
timeuse/=1000000;
if(debug)
printf("timeuse: %f\n", timeuse);
if(debug) VWes9yn
printf("offsets :%d \n", \
vd->mbuf.offsets[vd->frame_current]);%pC(c+n;n2k3D

// return 1
img_tmp = vd->map + vd->mbuf.offsets[vd->frame_current];
return (int)img_tmp;

}.?6^0D$ck'Y

int v4l_ummap(v4l_device *vd)
{7|Jfq'p+?K5H;L
munmap(vd->map, vd->mbuf.size);}[y(q1S.J
return 0;
}d ?$s3au-^aT@/n$R,]x
K?{&J!P#@Gq
int v4l_close(v4l_device *vd)`3b+k@ |m
{
close(vd->fd);
return 0;8D'kJW7aq(n4Ng
}

void rgb_to_jpeg (char *filename, unsigned char *img, int quality, int gray)；4H5V8X+m$_xD!G

8wH.Pp*U4ua`"L!Uw
帮忙看看为什么呢v/u cN*k|.u,@ d
c6h7AZ9M1N^q,NE w
[[i] 本帖最后由 zonewone 于 2008-4-25 15:46 编辑 [/i]]

flag 发表于 2008-4-26 20:27

vd声明在哪里，楼主告诉我先？不会又说是贴错了吧:L W9u&QMX0Z
k2mJ6~S gz9`%NK
最近怎么帖子帖出来的代码这么怪的。。。。。。

zonewone 发表于 2008-4-28 13:41

vd声明在哪里，楼主告诉我先？不会又说是贴错了吧

最近怎么帖子帖出来的代码这么怪的。。。。。。
EmV0}|0A ^ h:{
vd 的声明在main.h里面
-o m)}H P6u]
v4l_device vd;
如果是声明的问题，前面那种方式能正确执行么？

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