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Author Topic: [Ethernet + SD] Download zip files from SD  (Read 706 times)
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bl0w
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« on: June 28, 2012, 09:47:58 am »
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I'm making a website with ethernet shield.

I wanted to click a link, and download a file from the memory card. Example: zip file

Click a link and do a task I know, I just wanted the part of the SD.

Anybody can help me?
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bl0w
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« Reply #1 on: June 30, 2012, 02:14:26 pm »
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and files *.txt, its possible?


 smiley-roll-sweat sorry for double post.
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PaulS
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« Reply #2 on: June 30, 2012, 06:03:21 pm »
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Quote
I'm making a website with ethernet shield.
That's possible.

Quote
I wanted to click a link
Your web page, provided by the Arduino, needs to contain links. Does it? What does the Arduino do when a link is selected?

Quote
Example: zip file
What is the browser going to do with a zip file?

Quote
Click a link and do a task I know,
You haven't demonstrated this.

Quote
I just wanted the part of the SD.
The SD library comes with examples for listing the files on an SD card, and for reading from an SD card. Combining the relevant example with the web server code should be trivial. Read from a file and write to the client. Nothing really to it.
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bl0w
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« Reply #3 on: July 01, 2012, 04:42:04 pm »
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Quote from: PaulS on June 30, 2012, 06:03:21 pm
What is the browser going to do with a zip file?

The browser download the file to PC

Quote from: PaulS on June 30, 2012, 06:03:21 pm
You haven't demonstrated this.

The code:
Code:
EthernetClient client = server.available();
  if (client) {
    Serial1.println(F("new client"));
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    String vars;

    int varDL=0;
    int dlaio=0;

    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial1.write(c);
        vars.concat(c);

        if (vars.endsWith("=Download"))
        {
          varDL=1;
        }
        else if (vars.endsWith("/download/arduinoIO"))
        {
          varDL=1;
          dlaio=1;
        }

if (c == '\n' && currentLineIsBlank) {
          client.println(F("HTTP/1.1 200 OK"));
          client.println(F("Content-Type: text/html"));
          client.println(F("Connnection: close"));
          client.println();
          client.println(F("<!DOCTYPE HTML>"));
          client.println(F("<html>"));
          client.println(F("<head>"));
          // meta tag -> Faz refresh ao browser de 2 em 2 segundos
          client.println(F("<meta http-equiv=\"refresh\" content=\"2\">"));

(...)

if (varDL==1) // DOWNLOAD CENTER
          {
            client.println(F("<h1>Downloads</h1>"));
            client.println(F("<a href='/download/arduinoIO'>Matlab Support Package for Arduino (Arduino IO)</a>"));
          }
if (dlaio==1) // DOWNLOAD ARDUINO IO
          {
           //CODE FOR DOWNLOAD FILE
          }

(...)


Quote from: PaulS on June 30, 2012, 06:03:21 pm
The SD library comes with examples for listing the files on an SD card, and for reading from an SD card. Combining the relevant example with the web server code should be trivial. Read from a file and write to the client. Nothing really to it.
But the library only read/write txt files.
« Last Edit: July 01, 2012, 04:56:55 pm by bl0w » Logged

PaulS
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« Reply #4 on: July 01, 2012, 04:51:27 pm »
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But the library only read/write txt files.
The examples only show how to read/write text files, since they are the easiest to demonstrate proper functionality.

There is nothing in the library that restricts it from operating on files with other extensions. Whether a file contains "text" or binary data depends on what you write to the file. Text IS binary data, after all.
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bl0w
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« Reply #5 on: July 01, 2012, 05:29:01 pm »
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Code:
if (dlaio==1) // DOWNLOAD ARDUINO IO
          {
           myFile = SD.open("ArduinoIO.zip");
           if (myFile)
           {
             // read from the file until there's nothing else in it:
             while (myFile.available())
             {
               client.write(myFile.read());
             }
             // close the file:
             myFile.close();
           }
           else
           {
             // if the file didn't open, print an error:
             client.println("FILE NOT FIND");
           }
}


i do this: replace Serial.write(myFile.read()); for client.write(myFile.read()); and don't work



to tell the browser that arduino are writing an html page we do:
Code:
client.println(F("HTTP/1.1 200 OK"));
client.println(F("Content-Type: text/html"));

do we have to do a similar thing to another file type? how can I indicate this?
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« Reply #6 on: July 01, 2012, 05:51:39 pm »
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Quote
do we have to do a similar thing to another file type?
Yes. The type follows the / (text/html --> text/zip).

Code:
               client.write(myFile.read());
You should look at the return type from myFile.read() and the expected input to client.write(). You will see that they don't match. An intermediate variable or an explicit cast may be required.
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bl0w
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« Reply #7 on: July 02, 2012, 10:00:04 am »
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if i do this:

Code:
EthernetClient client = server.available();
  if (client) {
    Serial1.println(F("new client"));
    boolean currentLineIsBlank = true;
    String vars;

    int varDL=0;
    int dlaio=0;
    int html=1;
    int txt=0;
    int zip=0;
    int dltext=0;

if (vars.endsWith("=Download"))
        {
          varDL=1;
          dlaio=0;
          zip=0;
          html=1;
          dltext=0;
          txt=0;
        }
        else if (vars.endsWith("/download/ArduinoIO.zip"))
        {
          varDL=1;
          dlaio=1;
          zip=1;
          html=0;
          txt=0;
        }
        else if (vars.endsWith("/download/sensor.txt"))
        {
          varDL=1;
          dlaio=0;
          dltext=1;
          zip=0;
          html=0;
          txt=1;
        }

if (c == '\n' && currentLineIsBlank) {
          // Cliente terminou de comunicar e o arduino tem de enviar
          // o seguinte cabeçalho para o browser
          client.println(F("HTTP/1.1 200 OK"));
          if(html==1)
          {
          client.println(F("Content-Type: text/html"));
          }
          if(txt==1)
          {
            client.println(F("Content-Type: text/txt"));
          }
          if(zip==1)
          {
            client.println(F("Content-Type: text/zip"));
          }
          client.println(F("Connnection: close"));
          client.println();
         
          client.println(F("<!DOCTYPE HTML>"));
          client.println(F("<html>"));
          client.println(F("<head>"));
          client.println(F("<meta http-equiv=\"refresh\" content=\"2\">"));

(...)

if (varDL==1) // DOWNLOAD CENTER
          {
            client.println(F("<h1>Downloads</h1>"));
            client.println(F("<a href='/download/ArduinoIO.zip'>Matlab Support Package for Arduino (Arduino IO)</a>"));
            client.println(F("<a href='/download/sensor.txt'>TESTE</a>"));
          }
         
          if (dltext==1) // download sensor.txt
          {
            myFile = SD.open("sensor.txt");
            if (myFile)
            {
              while (myFile.available())
              {
                client.write(myFile.read());
              }
              myFile.close();
            }
            else
            {
              client.println("FILE NOT FIND");
            }
          }
         
          if (dlaio==1) // DOWNLOAD ARDUINO IO
          {
            myFile = SD.open("ArduinoIO.zip");
            if (myFile)
            {
              while (myFile.available())
              {
                client.write(myFile.read());
              }
              myFile.close();
            }
            else
            {
              client.println("FILE NOT FIND");
            }
          }
client.println(F("</body>"));
client.println(F("</html>"));

(...)

The result is this:

FOR ZIP FILE:


FOR TXT FILE:


in the case of. * txt file the true file is this:




I am not able to do that, anyone who knows can tell me?
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PaulS
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« Reply #8 on: July 02, 2012, 11:18:43 am »
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Code:
                client.write(myFile.read());
myFile.read() returns an int. The data of interest is in the low order byte. You need to research what happens when you call client.write() with an int. It may be sending both the high order byte and the low order byte, which would definitely screw up the file as saved on the PC.

It is not really recommended that you do this. Create an intermediate variable of the correct type to hold the output of the read() method, then call the write() method with that variable.

The Content-Type record should contain application/zip, not text/zip (sorry about that).

You may need to use a "Content-Encoding" record, too.
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bl0w
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« Reply #9 on: July 02, 2012, 12:21:51 pm »
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Maybe this:
Code:
char myStrings[];
File myFile;

//(...)

if (varDLtxt==1) // download sensor.txt
          {
            int i;
            myFile = SD.open("sensor.txt");
            if (myFile)
            {
              while (myFile.available())
              {
                i=0;
                myStrings[i]=myFile.read();
                i=i+1;
                client.write(myStrings);
              }
              myFile.close();
            }
            else
            {
              client.println("FILE NOT FIND");
            }
          }
//(...)

but we can't declare an array without size, right?


Edit: I test with char myStrings[100];
Now appears the right values on page, but don't download.
« Last Edit: July 02, 2012, 01:06:00 pm by bl0w » Logged

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