Question

所以我有这个脚本将条形码发送到服务器（在收到条形码时应该用代码200响应）。我想知道的是我如何在我的C脚本中检查这一点。例如
if（ServerResponse == 200）
printf（您的条形码已被传输）

我的英语不好以及我的C知识非常糟糕

#include <stdio.h >
#include <stdlib.h>
#include <string.h>

int main(int argc,char *argv[])

{ 
while (1)
    {
    char buf[256],syscmd[512];
    int i;

    /* Get next barcode */
    printf("Waiting for bar code [q=quit]:  ");
    if (fgets(buf,255,stdin)==NULL)
        break;

    /* Clean CR/LF off of string */
    for (i=0;buf[i]!='\0' && buf[i]!='\r' && buf[i]!='\n';i++);
    buf[i]='\0';

    /* q = quit */
    if (!strcmp(buf,"q"))
        break;

    /* Build into curl command */
    sprintf(syscmd,"curl \"http://www.xyz.com/test/order/complete?barcode=%s\"",buf);

    /* Execute--this will wait for command to complete before continuing. */
    system(syscmd);
    } 
return(0);
}

Answer 1

我会调查popen，因为curl会默认将数据打印到stdout（如果不是，请查看man curl），popen会让你读取数据。

HTTP标头（http://www.w3.org/Protocols/rfc2616/rfc2616.html）描述了该代码的确切位置。另外，我建议确保数据不会溢出syscmd。

char *base = "curl \"http://www.xyz.com/test/order/complete?barcode=\"";
if (strlen(base) + strlen(buf) > 511)
{
     fprintf(stderr, "Error! buffer overflow would have happened!\n");
     return 1;
}
else
{
     sprintf(syscmd, "curl \"http://www.xyz.com/test/order/complete?barcode=%s\"", buf);
     FILE *p = popen(syscmd, "r");
     //check the output for HTTP code 200 here 
}

希望对你有所帮助。

编辑：检查代码也非常简单

//assume you are using the code from above
int code;
fscanf(p, "HTTP/1.1 %d", &code); //either HTTP/1.1 or HTTP/1.0 depending on your server
if (code == 200)
{
    printf("Yupp, all good :)\n");
}
else
{
    printf("Server did not do so well with that request :(\n");
}

在C中检查服务器响应代码200

1 个答案: