更改文本中的值并将其存储在 C 中的字符数组中

发布于 2024-11-02 02:42:16 字数 1215 浏览 8 评论 0原文

我需要一些有关以下场景的信息：我有一个存储有 SIP INVITE 消息的数组

char array_invite[] =        "INVITE sip:[email protected] SIP/2.0\r\n"
                             "Via:SIP/2.0/UDP 5.6.7.8:39708;\r\n"
                             "Max-Forwards: 70\r\n"
                             "Contact:<sip:305@ 5.6.7.8>\r\n"
                             "To: <sip:[email protected]>; \r\n"
                             "From: \042Client\042<sip:[email protected]>;\r\n"
                             "Call-ID: abcdefg\r\n"
                             "CSeq: 1 INVITE\r\n"
                             "Content-Type: application/sdp\r\n"
                             "Content-Length: 142\r\n";

，我想更改 IP 地址（1.2.3.4 和 5.6.7.8）和 ID 号（302 和 305）的硬编码值并使其生效动态，这样我想在终端输出中手动输入值，以便对于每个会话我可以连接到不同的远程地址。由于我对 CI 不太熟悉，所以发布了这个问题。

任何人都知道如何在 C 中完成此操作，可能是一个很好的

例子开发者

原文

I need some information regarding a scenario where I have an array stored with SIP INVITE message

char array_invite[] =        "INVITE sip:[email protected] SIP/2.0\r\n"
                             "Via:SIP/2.0/UDP 5.6.7.8:39708;\r\n"
                             "Max-Forwards: 70\r\n"
                             "Contact:<sip:305@ 5.6.7.8>\r\n"
                             "To: <sip:[email protected]>; \r\n"
                             "From: \042Client\042<sip:[email protected]>;\r\n"
                             "Call-ID: abcdefg\r\n"
                             "CSeq: 1 INVITE\r\n"
                             "Content-Type: application/sdp\r\n"
                             "Content-Length: 142\r\n";

I want to change the hard code values for the IP Address (1.2.3.4 and 5.6.7.8) and the ID number(302 and 305) and make it dynamic such that I want to enter the values manually in my terminal output so that for each session I can connect to different remote addresses. Since I am not that fluent in C I am posting this question.

Anybody has an idea of how this can be done in C, may be an example would be good

Regards
Dev

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尴尬癌患者 2024-11-09 02:42:16

使用 sprintf 就可以了。

char array_invite[MAXLENGTH];
sprintf(array_invite,"Meet me at port %d\n",portnum);

Using sprintf will work.

char array_invite[MAXLENGTH];
sprintf(array_invite,"Meet me at port %d\n",portnum);

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薄荷港 2024-11-09 02:42:16

您应该使用 snprintf() 从格式化“template”，如下所示：

char buffer[4096];
int ip{[4];

ip[0] = 1;
ip[1] = 2;
ip[2] = 3;
ip[3] = 4;

snprintf(buffer, sizeof buffer, "INVITE sip:302@%d.%d.%d.%d SIP/2.0\r\n"
                             "Via:SIP/2.0/UDP 5.6.7.8:39708;\r\n"
                             "Max-Forwards: 70\r\n"
                             "Contact:<sip:305@ 5.6.7.8>\r\n"
                             "To: <sip:[email protected]>; \r\n"
                             "From: \042Client\042<sip:[email protected]>;\r\n"
                             "Call-ID: abcdefg\r\n"
                             "CSeq: 1 INVITE\r\n"
                             "Content-Type: application/sdp\r\n"
                             "Content-Length: 142\r\n", ip[0], ip[1], ip[2], ip[3]);

在这里，我只模板化了第一个 IP 地址，并将其表示为四个 int:s。您需要将其扩展到要动态格式化的其余字段。

You should use snprintf() to build the string from a formatting "template", like so:

char buffer[4096];
int ip{[4];

ip[0] = 1;
ip[1] = 2;
ip[2] = 3;
ip[3] = 4;

snprintf(buffer, sizeof buffer, "INVITE sip:302@%d.%d.%d.%d SIP/2.0\r\n"
                             "Via:SIP/2.0/UDP 5.6.7.8:39708;\r\n"
                             "Max-Forwards: 70\r\n"
                             "Contact:<sip:305@ 5.6.7.8>\r\n"
                             "To: <sip:[email protected]>; \r\n"
                             "From: \042Client\042<sip:[email protected]>;\r\n"
                             "Call-ID: abcdefg\r\n"
                             "CSeq: 1 INVITE\r\n"
                             "Content-Type: application/sdp\r\n"
                             "Content-Length: 142\r\n", ip[0], ip[1], ip[2], ip[3]);

Here, I only templatized the first IP address, and represented it as four int:s. You will need to extend this for the rest of the fields that you want to format dynamically.

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