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Old 12-02-2004, 04:26 AM   #1
chiahsin
LQ Newbie
 
Registered: Dec 2004
Posts: 6

Rep: Reputation: 0
Talking scanf strange behavior


hello:

Here is the program I try to send queue,I try to read some imformaiton from stdin and load it in structure and then send to queue, but the scanf don't wait for me to input value
#include <stdio.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <errno.h>
extern int errno;
int main()
{
struct msgbuf1{
long mtype;
char mtext[100];
} sndbuf , *msgp;
int rtrn, msgqid ;
char strbuf[100];
if ( (msgqid = msgget(0x888, IPC_CREAT|0600)) == -1 )
{fprintf(stderr, "msgget 888 failed !\n");exit(1);}
while(1)
{
msgp=&sndbuf;
printf("請輸入交易種類\n");
scanf(strbuf);
msgp->mtype=atoi(strbuf);
printf("請輸入帳戶姓名\n");
scanf("%s",sndbuf.mtext);
strcat(sndbuf.mtext,"|");
printf("請輸入帳戶餘額\n");
scanf(strbuf);
strcat(sndbuf.mtext,strbuf);
rtrn=msgsnd(msgqid,msgp,strlen(sndbuf.mtext),0);
if (rtrn == -1)
{perror("msgsnd");exit(2);}
}
}
 
Old 12-02-2004, 06:51 AM   #2
shmonkey
Member
 
Registered: Nov 2004
Location: UK
Distribution: Ubuntu
Posts: 118

Rep: Reputation: 15
I'm not sure scanf(strbuf); is allowed, does it work ?

try using fflush(stdin); after each call to scanf.

Note: fgets is considered a better (more secure) function to use then scanf.

Regards

Shmonkey
 
Old 12-02-2004, 07:25 PM   #3
chiahsin
LQ Newbie
 
Registered: Dec 2004
Posts: 6

Original Poster
Rep: Reputation: 0
hello:

it's the scanf usage problem, thank you !!!
 
  


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