查看windows版本兩種方法:
1. 指令ver
Microsoft Windows [版本 10.0.17134.471]
2. 指令 slmgr.vbs -dlv
軟體授權服務版本: 10.0.17134.471
名稱: Windows(R), Professional edition
描述: Windows(R) Operating System, VOLUME KMSCLIENT channel
啟用識別碼: x-x-x-x-x
應用程式識別碼: x-x-x-x-x
延伸的PID: x-x-x-x-x-1028-17134.0000-1382018
產品金鑰通路: Volume: GVLK
安裝識別碼: x
部分產品金鑰: x
授權狀態: 已取得授權
大量授權啟用到期: 255777分鐘(178天)
剩餘的Windows重設授權狀態計數: 1001
剩餘的SKU重設授權狀態計數: 1001
信任時間: 2018/12/13 下午06:42:18
已設定的啟用類型: All
最近的啟用資訊:
金鑰管理服務用戶端資訊
用戶端電腦識別碼(CMID): x-x-x-x-x
已登錄的KMS電腦名稱: x.x.edu.tw:1688
KMS電腦IP位址: x.x.x.x
KMS電腦延伸的PID: x-x-x-x-x-1028-9600.0000-2932015
啟用間隔: 120分鐘
更新間隔: 10080分鐘
啟用KMS主機快取
2018年12月13日 星期四
how to check windows version
2018年11月28日 星期三
four design examples for the add function as class or instance methods
一個運算的方法到底要定義為類別方法或物件方法，完全取決於設計者。 底下以簡單的整數加法運算為例，說明定義為類別方法或物件方法時，製作及使用上的差別。 一般是類別設計者先決定運算要如何使用，再決定如何製作。 四種設計關鍵在於: 類別方法或物件方法 vs 結果回傳或覆蓋第1數 (1) 類別方法，回傳結果 public class WholeNumber { public int number; public WholeNumber(int n) { this.number = n; } public String toString() { return String.format("%d", number); } public static WholeNumber add(WholeNumber n1, WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = n1.number + n2.number; return n; } // n3:7 = n1:3 + n2:4 public static void main(String args[]) { WholeNumber n1 = new WholeNumber(3); WholeNumber n2 = new WholeNumber(4); WholeNumber n3 = WholeNumber.add(n1, n2); System.out.printf("n3:%s = n1:%s + n2:%s\n", n3, n1, n2); } } (2) 類別方法，結果覆蓋第1數 public class WholeNumber { public int number; public WholeNumber(int n) { this.number = n; } public String toString() { return String.format("%d", number); } public static void add(WholeNumber n1, WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = n1.number + n2.number; n1.number = n.number; } // n1:7 = n1:3 + n2:4 public static void main(String args[]) { WholeNumber n1 = new WholeNumber(3); WholeNumber n2 = new WholeNumber(4); WholeNumber n1_copy = new WholeNumber(3); WholeNumber.add(n1, n2); System.out.printf("n1:%s = n1:%s + n2:%s\n", n1, n1_copy, n2); } } (3) 物件方法，回傳結果 public class WholeNumber { public int number; public WholeNumber(int n) { this.number = n; } public String toString() { return String.format("%d", number); } public WholeNumber add(WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = this.number + n2.number; return n; } // n3:7 = n1:3 + n2:4 public static void main(String args[]) { WholeNumber n1 = new WholeNumber(3); WholeNumber n2 = new WholeNumber(4); WholeNumber n3 = n1.add(n2); System.out.printf("n3:%s = n1:%s + n2:%s\n", n3, n1, n2); } } (4) 物件方法，結果覆蓋第1數 public class WholeNumber { public int number; public WholeNumber(int n) { this.number = n; } public String toString() { return String.format("%d", number); } public void add(WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = this.number + n2.number; this.number = n.number; } // n1:7 = n1:3 + n2:4 public static void main(String args[]) { WholeNumber n1 = new WholeNumber(3); WholeNumber n2 = new WholeNumber(4); WholeNumber n1_copy = new WholeNumber(3); n1.add(n2); System.out.printf("n1:%s = n1:%s + n2:%s\n", n1, n1_copy, n2); } } 以上四種寫法也可以合併成一支如下類別，方便比較四種用法的不同: class WholeNumber { public int number; public WholeNumber(int n) { this.number = n; } public WholeNumber(WholeNumber n) { this.number = n.number; } public String toString() { return String.format("%d", number); } public static WholeNumber classAddReturn(WholeNumber n1, WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = n1.number + n2.number; return n; } public static void classAddOverwrite(WholeNumber n1, WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = n1.number + n2.number; n1.number = n.number; } public WholeNumber instanceAddReturn(WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = this.number + n2.number; return n; } public void instanceAddOverwrite(WholeNumber n2) { WholeNumber n = new WholeNumber(0); n.number = this.number + n2.number; this.number = n.number; } /* n3:7 = n1:3 + n2:4 n1:7 = n1:3 + n2:4 n4:7 = n1:3 + n2:4 n1:7 = n1:3 + n2:4 */ public static void main(String args[]) { WholeNumber n1,n2,n3,n4,n1_copy; n1 = new WholeNumber(3); n2 = new WholeNumber(4); n3 = WholeNumber.classAddReturn(n1, n2); System.out.printf("n3:%s = n1:%s + n2:%s\n", n3, n1, n2); n1_copy = new WholeNumber(n1); WholeNumber.classAddOverwrite(n1_copy, n2); System.out.printf("n1:%s = n1:%s + n2:%s\n", n1_copy, n1, n2); n4 = n1.instanceAddReturn(n2); System.out.printf("n4:%s = n1:%s + n2:%s\n", n4, n1, n2); n1_copy = new WholeNumber(n1); n1_copy.instanceAddOverwrite(n2); System.out.printf("n1:%s = n1:%s + n2:%s\n", n1_copy, n1, n2); } }
Virtual Machine Spec for Google Colab Environment
Google Colab提供最多12小時連線的Jupyter Notebook開發環境，其2018年底層的虛擬機實測規格如下: CPU: Intel(R) Xeon(R) TwinCore @ 2.20GHz x 2 Memory: 13GB Drive: 347GB GPU: Tesla K80 with 4992 cores at 556MHz + 11GB Memory OS: Ubuntu 18.04.1 LTS Time Limit: 12 hours 規格實測的python指令如下: # https://stackoverflow.com/questions/48750199/google-colaboratory-misleading-information-about-its-gpu-only-5-ram-available # memory footprint support libraries/code !ln -sf /opt/bin/nvidia-smi /usr/bin/nvidia-smi !pip install gputil !pip install psutil !pip install humanize import psutil import humanize import os import GPUtil as GPU GPUs = GPU.getGPUs() # XXX: only one GPU on Colab and isn? guaranteed gpu = GPUs[0] def printm(): process = psutil.Process(os.getpid()) print("Gen RAM Free: " + humanize.naturalsize( psutil.virtual_memory().available ), " | Proc size: " + humanize.naturalsize( process.memory_info().rss)) print("GPU RAM Free: {0:.0f}MB | Used: {1:.0f}MB | Util {2:3.0f}% | Total {3:.0f}MB".format(gpu.memoryFree, gpu.memoryUsed, gpu.memoryUtil*100, gpu.memoryTotal)) printm() !df !cat /etc/issue !nvidia-smi !nvidia-smi -L !cat /proc/cpuinfo !cat /proc/meminfo
2018年6月27日 星期三
create bootable iso from windows installation files
如果擁有Windows作業系統安裝檔案，可以利用ImgBurn軟體，將微軟安裝目錄製作成.iso，方便虛擬機安裝作業系統之用。
其關鍵步驟在選擇正確開機檔案，及載入磁區數目。重要參數如下:
1.Source: Windows作業系統安裝檔案位置
2.Destination: .iso檔案位罝
3.Advanced/Bootable Disc
Make Image Bootable
Emulation Type: None (Custom)
Boot Image: \boot\etfsboot.com
Platform ID: 80x86
Developer ID: Microsoft Corporation
Load Segment: 07C0
Sectors To Load: 8
4.Build
其中，載入磁區數目為8，推測是因為etfsboot.com檔案為4KB，佔512B磁區8個。
參考: Youtube: How to create a Bootable ISO Image *from* a Bootable USB Drive
2018年1月25日 星期四
how to decode web content in gzip or deflate format using Java API?
有些網站回傳網頁會進行內容壓縮，壓縮方法常見有gzip或deflate，
可由回傳內容的ContentEncoding標頭決定如何處理回傳的壓縮內容。
以Java為例，解壓縮寫法如下:
// 設定下載網址
URL url = new URL("http://comment.bilibili.tv/29545595.xml");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//conn.setRequestProperty("Accept-Encoding", "identity");
// 連線取得網頁輸入流
conn.connect();
System.out.printf("con.getContentEncoding()=%s\n",conn.getContentEncoding());
InputStream in = conn.getInputStream();
if(conn.getContentEncoding().equals("gzip"))
in = new GZIPInputStream(conn.getInputStream());
if(conn.getContentEncoding().equals("deflate"))
in = new InflaterInputStream(conn.getInputStream(), new Inflater(true));
// 從網頁輸入流列印內容到螢幕
BufferedReader bin = new BufferedReader(new InputStreamReader(in, "UTF-8"));
String s = null;
while((s=bin.readLine())!=null){
System.out.println(s);
}
bin.close();
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