forked from KolibriOS/kolibrios
133 lines
4.9 KiB
HTML
133 lines
4.9 KiB
HTML
<html>
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<head>
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<title>áèáëèîòåêà äëÿ ïîëó÷åíèÿ èíôîðìàöèè èç ôîðìàòà Exif</title>
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<meta http-equiv="content-type" content="text/html; charset=WINDOWS-1251">
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<style>
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body
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{
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font-size: 15px;
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font-family: "Bookman Old Style";
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color: black;
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text-align: justify;
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}
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h1 { color: green; font-size: 23px; }
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h2 { color: green; font-size: 21px; }
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h3 { color: green; font-size: 19px; }
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h4 { color: #803f00; font-size: 17px; }
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i { color: #0099cc; }
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b { color: #0099cc; }
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p {
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text-indent: 1em;
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margin-top: 3px;
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margin-bottom: 2px;
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margin-left: 0px;
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margin-right: 0px;
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}
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ol, ul, dl{
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margin-top: 3px;
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margin-bottom: 2px;
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}
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pre
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{
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padding: 2px;
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padding-left: 20px;
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margin-top: 5px;
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margin-bottom: 5px;
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margin-left: 0px;
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margin-right: 0px;
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font-family: "Courier New";
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font-size: 15px;
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color: #004000;
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background-color: #ffd0ff;
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}
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table { font-size: 15px; }
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</style>
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</head>
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<body>
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<h1>Îãëàâëåíèå</h1>
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<ul>
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<li>Âñòóïëåíèå</li>
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<li><a href="#fun">Ôóíêöèè</a></li>
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<ul>
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<li><a href="#f_1">exif_get_app1</a></li>
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<li><a href="#f_2">exif_get_app1_tag</a></li>
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<li><a href="#f_3">exif_get_app1_child</a></li>
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</ul>
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</li>
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<li><a href="#const">Êîíñòàíòû äëÿ ôóíêöèè exif_get_app1_child</a></li>
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<li><a href="#tabl_e">Òàáëèöà ýêñïîðòà</a></li>
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<li><a href="#hist">Èñòîðèÿ</a></li>
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</ul>
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<h1>Âñòóïëåíèå</h1>
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<p>Äîêóìåíòàöèÿ ê ñâîáîäíîé áèáëèîòåêå <b>exif.obj</b>, äëÿ <b>ÎÑ Êîëèáðè</b>.
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Ýòà áèáëèîòåêà ñîçäàíà äëÿ ïðîñìîòðà èíôîðìàöèè íàõîäÿùåéñÿ â èçîáðàæåíèÿõ â ôîðìàòå Exif. Èíôîðìàöèÿ ýòà ñîçäàåòñÿ öèôðîâûìè ôîòîêàìåðàìè è ñîäåðæèò ðàçíûå ïàðàìåòðû íàïðèìåð òàêèå êàê: íàçâàíèå ôèðìû ïðîèçâîäèòåëÿ, ìîäåëü êàìåðû, è ò.ä.</p>
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<p>Ïîñëåäíåå îáíîâëåíèå áèáëèîòåêè 22.07.14.</p>
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<h1><a name="fun">Ôóíêöèè</a></h1>
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<p>Ôóíêöèè ðàáîòàþò ñ óêàçàòåëÿìè íà ñòðóêòóðû app1 èëè íà app1_child. Ïðèìåð ñòðóêòóðû:</p>
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<pre>align 4
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h_app1:
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dd 0 ;+0 óêàçàòåëü íà êîëè÷åñòâî òåãîâ è íà ñàìè òåãè
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dd 0 ;+4 ñìåùåíèå äîáàâëÿåìîå ê óêàçàòåëÿì â òåãàõ
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dw 0 ;+8 ïàðàìåòð, îòâå÷àþùèé çà ïîðÿäîê ñëåäîâàíèÿ áàéòîâ</pre>
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dw 0 ;+10 èäåíòèôèêàòîð äëÿ ãðóïïû òåãîâ</pre>
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<h4><a name="f_1">exif_get_app1</a></h4>
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<p>Ýòà ôóíêöèÿ èùåò íà÷àëî Exif äàííûõ. Åñëè îíè íàéäåíû òî çàïîëíÿåòñÿ ñòðóêòóðà app1. Åñëè íå íàéäåíû, òî ïåðâûé ïàðàìåòð â ñòðóêòóðå äåëàåòñÿ ðàâíûì 0. Ïðèìåð:</p>
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<pre>stdcall [exif_get_app1], [open_file],h_app1
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...
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h_app1 dd 0,0,0</pre>
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<p>ãäå open_file - óêàçàòåëü íà äàííûå ôàéëà èçîáðàæåíèÿ (ïîêà ïîääåðæèâàþòñÿ òîëüêî *.jpg è *.jpeg).</p>
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<p>h_app1 - ñòðóêòóðà äëÿ çàïîìèíàíèÿ íà÷àëà Exif äàííûõ.</p>
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<h4><a name="f_2">exif_get_app1_tag</a></h4>
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<p>Çàïîëíÿåò òåêñòîâóþ ñòðîêó èìåíåì ïàðàìåòðà èç Exif è åãî çíà÷åíèåì. Ïðèìåð:</p>
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<pre>stdcall [exif_get_app1_tag], h_app1,3,txt_buf,80
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...
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h_app1 dd 0,0,0
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txt_buf rb 80</pre>
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<p>ãäå h_app1 - ñòðóêòóðà çàïîëåííàÿ â exif_get_app1 èëè â exif_get_app1_child.</p>
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<p>3 - ïîðÿäêîâûé íîìåð ïàðàìåòðà.</p>
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<p>txt_buf - òåêñòîâûé áóôåð äëÿ çàïîëíåíèÿ.</p>
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<p>80 - ìàêñèìàëüíàÿ äëèíà òåêñòà.</p>
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<h4><a name="f_3">exif_get_app1_child</a></h4>
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<p>Åñòü ïðîñòûå òåãè ñ èíôîðìàöèåé à åñòü òåãè óêàçûâàþùèå íà ñïèñêè äðóãèõ òåãîâ. Ýòà ôóíêöèÿ áåðåò óêàçàòåëü íà íà÷àëî ñïèñêà äî÷åðíèõ òåãîâ. Ïðèìåð:</p>
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<pre>stdcall [exif_get_app1_child], h_app1,h_child,0x8769
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...
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h_app1 dd 0,0,0
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h_child dd 0,0,0</pre>
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<p>ãäå h_app1 - ñòðóêòóðà çàïîëåííàÿ â exif_get_app1 èëè â exif_get_app1_child.</p>
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<p>h_child - ñòðóêòóðà äëÿ çàïîëåíèÿ äàííûõ ñïèñêà äî÷åðíèõ òåãîâ.</p>
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<p>0x8769 - êîä òåãà (íàõîäÿùåãîñÿ â ñïèñêå òåãîâ h_app1), êîòîðûé ÿâëÿåòñÿ óêàçàòåëåì íà ñïèñîê äðóãèõ äî÷åðíèõ òåãîâ.</p>
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<p> äàíîì ïðèìåðå ôóíêöèÿ áåðåò òåã 0x8769 è ïûòàåòñÿ íàéòè åãî â ñïèñêå h_app1, åñëè íàõîäèò òî çàïîëíÿåò ïî íåìó çíà÷åíèÿ â ñòðóêòóðå h_child. Äàëåå ê ñïèñêó h_child ìîæíî ïðèìåíÿòü ôóíêöèþ exif_get_app1_tag äëÿ âçÿòèÿ çíà÷åíèÿ ýòèõ òåãîâ. Ñ ïîìîùüþ ýòîé ôóíêöèè ìû êàê áû ïåðåõîäèì âíóòðü íåêîé "ïàïêè" ñ òåãàìè, êîòîðûå ñðàçó äîñòàòü íå ìîæåì.</p>
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<h1><a name="const">Êîíñòàíòû äëÿ ôóíêöèè exif_get_app1_child</a></h1>
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<p>Çäåñü ïðèâåäåíû íåêîòîðûå êîíñòàíòû, êîòîðûå ìîãóò èñïîëüçîâàòñÿ êàê 3-é ïàðàìåòð äëÿ ôóíêöèè exif_get_app1_child. Ýòè êîíñòàíòû îáîçíà÷àþò ñïåöèàëüíûå òåãè, êîòîðûå ñîäåðæàò ñìåùåíèå íà äî÷åðíèå ïàðàìåòðû, êîòîðûå íàõîäÿòñÿ â Exif.</p>
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<h4>0x8769</h4>
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<p>Îáîçíà÷àåò äîïîëíèòåëüíûå ïàðàìåòðû Exif.</p>
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<h4>0x8825</h4>
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<p>Îáîçíà÷àåò ïàðàìåòðû GPS.</p>
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<h1><a name="tabl_e">Òàáëèöà ýêñïîðòà</a></h1>
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<p>Ïðèìåð òàáëèöû ýêñïîðòà, ðàñ÷èòàííîé íà èñïîëüçîâàíèå ìàêðîñà <b>@use_library_mem</b>:</p>
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<pre>align 4
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import_exif:
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exif_get_app1 dd sz_exif_get_app1
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exif_get_app1_tag dd sz_exif_get_app1_tag
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exif_get_app1_child dd sz_exif_get_app1_child
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dd 0,0
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sz_exif_get_app1 db 'exif_get_app1',0
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sz_exif_get_app1_tag db 'exif_get_app1_tag',0
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sz_exif_get_app1_child db 'exif_get_app1_child',0</pre>
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<h1><a name="hist">Èñòîðèÿ</a></h1>
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<p>15.07.14 - ïåðâàÿ âåðñèÿ áèáëèîòåêè, ïðèìåð èñïîëüçîâàíèÿ.</p>
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</body>
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</html> |