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<p>String je object, dobře se s ním pracuje, netřeba hlídat konec,
spojování pomocí +, dá se v něm vyhledávat, zkracovat atd. (žere
podstatně více paměti)<br>
</p>
<p>string je pole charů předem s přesně definovanou délkou a lze se
na něj odkazovat pomocí pointeru (to na String nejde) (žere jen
n+1 byte )<br>
</p>
<p><br>
</p>
Petr<br>
<br>
<div class="moz-cite-prefix">Dne 31. 10. 17 v 12:38 hwnews
konference napsal(a):<br>
</div>
<blockquote type="cite"
cite="mid:CAFMbtH9=U-WkM33LYj88gdGLmP7RNXh_rcQ7T+a=yMUxJ1OYGg@mail.gmail.com">
<div dir="ltr">Aha no tak to je fajn...o tech stringach co nejsou
Stringy jsem tak nejak netusil....jo ted uz to dam
dohromady...snad ;-)
<div><br>
</div>
<div>RV</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">Dne 31. října 2017 12:35 Petr Zapadlo <span
dir="ltr"><<a href="mailto:zapik@email.cz"
target="_blank" moz-do-not-send="true">zapik@email.cz</a>></span>
napsal(a):<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Protože to je String a ne string :-)</p>
<p>String:</p>
<p><a class="m_5409446531146029777moz-txt-link-freetext"
href="https://www.arduino.cc/en/Reference/StringObject"
target="_blank" moz-do-not-send="true">https://www.arduino.cc/en/<wbr>Reference/StringObject</a></p>
<p>string = char array</p>
<p><a class="m_5409446531146029777moz-txt-link-freetext"
href="https://www.arduino.cc/en/Reference/String"
target="_blank" moz-do-not-send="true">https://www.arduino.cc/en/<wbr>Reference/String</a></p>
<p>To jsou 2 diametrálně odlišné proměnné a jinak se s
nimi pracuje.</p>
<p>Petr<br>
</p>
<p><br>
</p>
<br>
<div class="m_5409446531146029777moz-cite-prefix">Dne 31.
10. 17 v 12:33 hwnews konference napsal(a):<br>
</div>
<div>
<div class="h5">
<blockquote type="cite">
<div dir="ltr">Hmmm, tak proc funguje tohle:
<div><br>
</div>
<div>
<div>String message = "File Not Found\n\n";</div>
<div> message += "URI: ";</div>
<div> message += server.uri();</div>
<div> message += "\nMethod: ";</div>
<div> message += (server.method() ==
HTTP_GET)?"GET":"POST";</div>
<div> message += "\nArguments: ";</div>
<div> message += server.args();</div>
<div> message += "\n";</div>
<div> for (uint8_t i=0; i<server.args();
i++){</div>
<div> message += " " + server.argName(i) + ":
" + server.arg(i)+ "\n";<br>
</div>
<div> }<br>
</div>
<div> server.send(404, "text/plain", message);</div>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2017-10-31 12:20
GMT+01:00 Jaromir Sukuba <span dir="ltr"><<a
href="mailto:jarin.hw@gmail.com"
target="_blank" moz-do-not-send="true">jarin.hw@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex"><span>" message += " "
+ rv_text+ "\n";"<br>
</span>takto sa v C-cku stringy nespajaju.
Vlastne, v C-cku neexistuju<br>
stringy, ale polia char-ov ukoncene nulami (a
vlastne ani tie polia<br>
neexistuju, len kus pamate na ktory ukazuje
smernik). Tie sa daju<br>
spajat trebars cez funckiu strcat, alebo mozno
povedzme aj sprintf-om<br>
(ma vacsie moznosti, ale tazkopadnejsia
metoda).<br>
<div>
<div class="m_5409446531146029777h5"><br>
2017-10-31 12:11 GMT+01:00 hwnews
konference <<a
href="mailto:hwnews@cncnet.info"
target="_blank" moz-do-not-send="true">hwnews@cncnet.info</a>>:<br>
> Zdravim,<br>
><br>
> delam si ten palubni budik na lod s
e-ink displejem a ESP32. Ohybam nejake<br>
> knihovny, ktere jsou v examplech...na
displej uz kreslim, web mi take jede,<br>
> ale zasekl jsem se na pro me
nepochopitelne definici procedury:<br>
><br>
> void DrawStringAt(int x, int y, const
char* text, sFONT* font, int colored);<br>
><br>
> ja jsem tu deklaraci puvodne
nezkoumal, protoze primo vlozeny string
jako<br>
> parametr fungoval<br>
><br>
> Kdyz jsem to ale chtel pouzit takto
tak jsem si nabehnul:<br>
><br>
> for (uint8_t i=0; i<server.args();
i++){<br>
> rv_text = server.argName(i) + ":
" + server.arg(i);<br>
> message += " " + rv_text+ "\n";<br>
> paint.DrawStringAt(0, 0, rv_text,
&Font8, UNCOLORED);<br>
> epd.SetPartialWindow(paint.Ge<wbr>tImage(),
0, 20+(i*12), paint.GetWidth(),<br>
> paint.GetHeight());<br>
> }<br>
><br>
><br>
> void DrawStringAt(int x, int y, const
char* text, sFONT* font, int colored);<br>
>
^<br>
> epdpaint.h:56:10: note: no known
conversion for argument 3 from 'String'<br>
> to 'const char*'<br>
><br>
> cela ta procedura je napsana takto:<br>
><br>
> void Paint::DrawStringAt(int x, int
y, const char* text, sFONT* font, int<br>
> colored) {<br>
> const char* p_text = text;<br>
> unsigned int counter = 0;<br>
> int refcolumn = x;<br>
><br>
> /* Send the string character by
character on EPD */<br>
> while (*p_text != 0) {<br>
> /* Display one character on
EPD */<br>
> DrawCharAt(refcolumn, y,
*p_text, font, colored);<br>
> /* Decrement the column
position by 16 */<br>
> refcolumn += font->Width;<br>
> /* Point on the next
character */<br>
> p_text++;<br>
> counter++;<br>
> }<br>
> }<br>
><br>
> Jak by se to melo upravit abyto bylo
koser?<br>
><br>
> RV<br>
><br>
</div>
</div>
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