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4. 以積木式編程製作網絡應用程式
下載
下載

本文件涵蓋了下載在線內容的方法,包括視頻、圖片和文件。

下載在線視頻

下載…作為視頻

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"Download_video\"><value name=\"url\"><shadow type=\"text\"><field name=\"TEXT\"/></shadow></value></block></xml>"}

此塊用於從互聯網下載視頻。

參數: 字串 (URL)
輸出: 視頻
示例代碼:

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>video</variable></variables><block type=\"pxt-on-start\" x=\"0\" y=\"0\"><statement name=\"HANDLER\"><block type=\"variables_set\"><field name=\"VAR\">mainLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"variables_set\"><field name=\"VAR\">mainScreen</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Screen_create\"><value name=\"label\"><shadow type=\"text\"><field name=\"TEXT\">Main</field></shadow></value><value name=\"layout\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">video</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Download_video\"><value name=\"url\"><shadow type=\"text\"><field name=\"TEXT\">https://media.istockphoto.com/videos/aerial-sunrise-scenery-of-cityscape-of-tokyo-time-lapse-shot-night-to-video-id1246167884</field></shadow></value></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">video</field></block></value><next><block type=\"device_while\"><value name=\"COND\"><shadow type=\"logic_boolean\"><field name=\"BOOL\">TRUE</field></shadow></value><statement name=\"DO\"><block type=\"File_VideoContainer_play\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">video</field></block></value><next><block type=\"Task_sleep\"><value name=\"ms\"><shadow type=\"math_number\"><field name=\"NUM\">1</field></shadow></value></block></next></block></statement></block></next></block></next></block></next></block></next></block></statement></block></xml>"}

輸出:

下載為視頻 - 輸出

參考:

下載在線圖片

下載…如圖所示

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"Download_image\"><value name=\"url\"><shadow type=\"text\"><field name=\"TEXT\"/></shadow></value></block></xml>"}

此塊用於從互聯網下載圖像。

參數: 字串 (URL)
輸出: 圖片
示例代碼:

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>image</variable></variables><block type=\"pxt-on-start\" x=\"0\" y=\"0\"><statement name=\"HANDLER\"><block type=\"variables_set\"><field name=\"VAR\">mainLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"variables_set\"><field name=\"VAR\">mainScreen</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Screen_create\"><value name=\"label\"><shadow type=\"text\"><field name=\"TEXT\">Main</field></shadow></value><value name=\"layout\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">image</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Download_image\"><value name=\"url\"><shadow type=\"text\"><field name=\"TEXT\">https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/RedDot_Burger.jpg/1200px-RedDot_Burger.jpg</field></shadow></value></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">image</field></block></value></block></next></block></next></block></next></block></statement></block></xml>"}

輸出:

下載為影像 - 輸出

參考:

下載線上檔

下載…作為檔

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"Download_file\"><value name=\"url\"><shadow type=\"text\"><field name=\"TEXT\"/></shadow></value></block></xml>"}

此塊用於從互聯網下載檔。

參數: 字串 (URL)
輸出:
示例代碼:

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>file</variable><variable>image</variable></variables><block type=\"pxt-on-start\" x=\"0\" y=\"0\"><statement name=\"HANDLER\"><block type=\"variables_set\"><field name=\"VAR\">mainLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"variables_set\"><field name=\"VAR\">mainScreen</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Screen_create\"><value name=\"label\"><shadow type=\"text\"><field name=\"TEXT\">Main</field></shadow></value><value name=\"layout\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">file</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Download_file\"><value name=\"url\"><shadow type=\"text\"><field name=\"TEXT\">https://images.pexels.com/photos/1543793/pexels-photo-1543793.jpeg?auto=compress&amp;cs=tinysrgb&amp;dpr=1&amp;w=500</field></shadow></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">image</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"File_FileContainer_toImage\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">file</field></block></value></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">image</field></block></value></block></next></block></next></block></next></block></next></block></statement></block></xml>"}

輸出:

下載為檔案 - 輸出

參考:

目録