显示来自C ++嵌入式Web服务器的HTML图像 [英] displaying an HTML image from a C++ embeded web-server
问题描述
您好，
我使用Snorkel API开发了一个嵌入式Web服务器（http://snorkelembedded.webs.com）
C ++中的
，以及基于客户端（浏览器）提交的信息生成QR码。
现在我正在尝试显示动态QR码（保存在.jpg中）文件）在客户端浏览器中，但它不起作用。 Snorkel嵌入式Web服务器基于在C ++代码中定义HTML代码，如下所示：
Hello,
I've developed an embedded web-server using "Snorkel API" (http://snorkelembedded.webs.com)
in C++, and generated a QR code based on information submitted from the client (browser).
Now I'm trying to display the dynamic QR code (which is saved in a .jpg file) in the client-browser, but it's not working. The Snorkel embedded web-server is based on defining the HTML code within the C++ code as follows:
#pragma hdrstop
#pragma argsused
#include <snorkel.h>
#include <tchar.h>
#include <stdio.h>
#include <stdlib.h>
call_status_t index_htm(snorkel_obj_t http, /*read environment from this object */
snorkel_obj_t outstream) /* write data to the output stream */
{
if (snorkel_printf (outstream,"<html><body><img src="QR4.jpg" alt="QR code" width=178 height=178</body></html>\r\n")== SNORKEL_ERROR)
return HTTP_ERROR;
return HTTP_SUCCESS;
}
void syntax (char *pszProg)
{
fprintf (stderr, "syntax error:\n");
fprintf (stderr, "%s [-p <port>]\n", pszProg);
exit (1);
}
void main (int argc, char *argv[])
{
int i = 1;
int port = 80;
snorkel_obj_t http = 0;
char szExit[10];
for (; i < argc; i++)
{
if (argv[i][0] == '-' || argv[i][0] == '/')
{
char carg = argv[i][1];
switch (carg)
{
case 'p': /* port number */
port = atoi (argv[i + 1]);
i++;
break;
default:
syntax (argv[0]);
break;
}
}
}
/*
*
* initialize API
*
*/
if (snorkel_init () != SNORKEL_SUCCESS)
{
perror ("could not initialize snorkel\n");
exit (1);
}
/*
*
* create a server object
*
*/
http = snorkel_obj_create (snorkel_obj_server, 2, /* number of handler threads to create */
NULL /* directory containing index.html */);
if (!http)
{
perror ("could not create http server\n");
exit (1);
}
/*
*
* create a listener
*
*/
if (snorkel_obj_set (http, /* server object */
snorkel_attrib_listener, /* attribute */
port, /* port number */
0 /* SSL support */ )
!= SNORKEL_SUCCESS)
{
fprintf (stderr, "could not create listener\n");
snorkel_obj_destroy (http);
exit (1);
}
/*
*
* overload the URL index.html
*
*/
if (snorkel_obj_set (http, /* server object */
snorkel_attrib_uri, /* attribute type */
GET, /* method */
"/index.html", /* url */
contenttype_text, index_htm) != SNORKEL_SUCCESS)
{
perror ("could not overload index.html");
snorkel_obj_destroy (http);
exit (1);
}
if (snorkel_obj_set(http, snorkel_attrib_ipvers, IPVERS_IPV4, SOCK_SET) != SNORKEL_SUCCESS)
{
fprintf (stderr, "error could not set ip version\n");
exit (1);
}
/*
*
* start the server
*
*/
fprintf (stderr, "\n\n[HTTP] starting embedded server\n");
if (snorkel_obj_start (http) != SNORKEL_SUCCESS)
{
perror ("could not start server\n");
snorkel_obj_destroy (http);
exit (1);
}
/*
*
* do something while server runs
* as a separate thread
*
*/
fprintf (stderr, "\n[HTTP] started.\n\n"
"--hit enter to terminate--\n");
fgets (szExit, sizeof (szExit), stdin);
fprintf (stderr, "[HTTP] bye\n");
/*
*
* graceful clean up
*
*/
snorkel_obj_destroy (http);
exit (0);
}
我不知道，也许问题出在我写的HTML代码中。
一些身体pleeeeeeease可以帮助我，我正试图解决这个问题一个星期了。
最好的问候。
Rania
I don't know, maybe the problem is within the HTML code i'm writing.
Can some body pleeeeeeease help me, I'm trying to solve this problem for a week now.
Best Regards.
Rania
推荐答案
if you are still struggeling; try to work with following code snippet to write the image content(bytes) in the output stream;
<img src="QR4.jpg" alt="QR code" width="178" height="178">
//write the bytes from the image file
</img>
这篇关于显示来自C ++嵌入式Web服务器的HTML图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
