ESP32 Forum

Posted: **Fri Feb 10, 2017 5:31 pm**

Hi,

I'd like to serve up an html page, my server works fine with simple pages but when I try to use svg I get errors compiling and the build failed.

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const static char http_index_html[] =
		"<html><body><svg width=100% height=100% viewbox="0 0 200 200" id="svg"><rect .... etc

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/home/rob/esp32/workspace/myapp/main/./main.c:87:53: error: expected ',' or ';' before numeric constant
   "<html><body><svg width=100% height=100% viewbox="0 0 200 200" id="svg"><rect .... etc
                                                     ^

How should I define html the page properly?
Thanks
Rob

Posted: **Sun Feb 12, 2017 2:46 pm**

Hi, I found out the " characters were the problem, so I can easily escape them like \".

but is there a better way to store a static page on the esp32? As I develop the page further, it's getting boring adding \'s again and again.

Thanks
Rob

Posted: **Sun Feb 12, 2017 10:33 pm**

countxerox wrote:Hi, I found out the " characters were the problem, so I can easily escape them like \".

but is there a better way to store a static page on the esp32? As I develop the page further, it's getting boring adding \'s again and again.

Thanks
Rob

hi

there are more ways for this..
one here:
try this:
example your file is named fine.txt
put this file in the folder of your project
example
\main\fine.txt

in your code write:

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extern const uint8_t my_extern_file[] asm("_binary_fine_txt_start");

then you can use it like you want to do:

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..
printf("%s", my_extern_file);
..
printf((char *)my_extern_file);
..

similar to this
you can create a html file like it is ( fine.html )

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extern const uint8_t my_extern_file[] asm("_binary_fine_html_start");

same procedure

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..
printf("%s", my_extern_file);
..
printf((char *)my_extern_file);
..
// and so on
// socket_send((char *)my_extern_file,......

if you compile your project
the file gets symbol and is fixed in the flash on write the bin to esp32

let me know how you get on in this
hope this helps

best wishes
rudi

edit:

Example: fine.tx

░♥░(¯`:´¯)░
░.(¯ `·.\|/.·´¯)
░(`♥·.(۞).·´¯)░(¯`:´¯)
░ (_.·´/|\`·._)(¯ `·.\|/.·´¯)
░ ░ (_.:._)…(¯ `·.(۞).·´¯)
░♥░ (¯`:´¯)░(_.·´/|\`·._)
♥░.(¯ `·.\|/.·´¯) ::(_.:._)
░ (¯ `·.(۞).·´¯)
░ ░(_.·´/|\`·._)
░♥♥». (_.:._)░

Example: SSL Zertifikate

OpenSSL Server Example

Posted: **Mon Feb 13, 2017 12:06 am**

Another possibility is to use the "xxd" tool. This takes an arbitrary file as input (binary or text) and can produce a header file that contains the data in the file that is safe to include in your other C programs. See:

http://linuxcommand.org/man_pages/xxd1.html

Posted: **Tue Feb 14, 2017 8:51 pm**

Hi,

Thanks both, this is great advice.

I added a line in component.mk to help the complier find the file I guess ...

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COMPONENT_EMBED_TXTFILES := fine.html

For netconn, the sizeof the data to send ...

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extern const uint8_t fine_html_start[] asm("_binary_fine_html_start");
extern const uint8_t fine_html_end[] asm("_binary_fine_html_end");
const unsigned int fine_html_bytes = fine_html_end - fine_html_start;

Then serving up the page is just ...

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netconn_write(conn, (char *)fine_html_start, fine_html_bytes, NETCONN_NOCOPY);

Thanks
Rob

Posted: **Tue Feb 14, 2017 11:19 pm**

Hi Rob,

Glad you got this working well. For the reference of anyone who finds this later on, the documentation for the COMPONENT_EMBED_TXTFILES/COMPONENT_EMBED_FILES feature is here:
http://esp-idf.readthedocs.io/en/latest ... inary-data

Angus

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