C#生成條形碼圖片的簡略辦法。本站提示廣大學習愛好者:(C#生成條形碼圖片的簡略辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#生成條形碼圖片的簡略辦法正文
本文實例講述了C#生成條形碼圖片的簡略辦法。分享給年夜家供年夜家參考。詳細完成辦法以下:
完成道理:
其實Windows自己就有一個字體是用來顯示條形碼的。
只需將數字改成這類字體就釀成了條形碼。
windows字體庫下,有以下八種字體可以用來將數字轉換成條形碼:
Code39AzaleaNarrow1
Code39AzaleaNarrow2
Code39AzaleaNarrow3
Code39AzaleaRegular1
Code39AzaleaRegular2
Code39AzaleaWide1
Code39AzaleaWide2
Code39AzaleaWide3
把代碼貼給年夜家參考:
Bitmap b=new Bitmap(200,200);
Graphics g = Graphics.FromImage(b);
Font font = new Font("Code39AzaleaRegular2", 32);
g.DrawString("123456", font, Brushes.Black, new PointF(100,100));
pictureBox1.BackgroundImage = b;
pictureBox1.BackgroundImageLayout = ImageLayout.Zoom
願望本文所述對年夜家的C#法式設計有所贊助。
jpg?201632815658" alt="" />圖片加載出來了,我們要看看日記,日記不會撒謊,我截圖的日記
適才是當地和內存都沒有那就的去收集下載了,一切日記打印的是開啟收集下載
但是第二次進入運用的時刻呢?還歸去開啟收集下載嗎?那確定不會的,要不如許要它有啥用呢?
看看吧這就是第二次進入運用的時刻的日記
從文件中加載圖片,不在須要開啟收集下載直接從文件中獲得,好了,如許成績就來了,從文件中讀取確定效力欠好呀,沒有直接從內存中讀取快吧!我們挪用體系保護好的一個算法,比來起碼應用算法,這個算法是在我學操作體系的時刻學到的,其時先生講了一下,不外還好,能在項目頂用到先生講的器械,對此,認為就這個就完了?我們應當把文件中的圖片讀取到內存中,如許避免像listview如許的疾速滑動發生的錯位bug。上面看看我在疾速滑動時的後果:
加載的圖片都是從內存中獲得,如許在後果下面就很好的啦!
好的,這麼好的圖片三級緩存,那究竟怎樣完成的呢和究竟怎樣用的呢?上面就貼出我寫的代碼吧!讓小同伴看看,趁便優化優化!
package com.example.util; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import android.graphics.BitmapFactory; import android.os.Handler; import android.os.Message; import android.support.v4.util.LruCache; import android.util.Log; /** * 圖片的三級緩存對象類{往後項目須要} * @author double 江 * */ public class ImageCachceUitl { public static final int SUCCSEE = 0; public static final int FAIL = 1; private Context context; private LruCache<String, Bitmap> cache;//lru算法聚集,string是圖片的url,bitmap為圖片的值類型 private File cacheDir; Handler handler; private ExecutorService executorService;//保護線性池 public ImageCachceUitl(Context context ,Handler handler){ this.context=context; this.handler=handler; cacheDir=context.getCacheDir();//取得cache文件夾 //保護幾個收集線程下載圖片 executorService=Executors.newFixedThreadPool(5); int maxSize=(int) (Runtime.getRuntime().maxMemory()/8);//取得運轉情況的內存年夜小的1/8 cache=new LruCache<String, Bitmap>(maxSize){ // TODO 每存儲一張圖片的年夜小(感化於內存溢出丟圖片) @Override protected int sizeOf(String key, Bitmap value) { //前往以後一行所占的字節數*高度,就是圖片的年夜小 return value.getRowBytes()*value.getHeight(); } };//以後圖片緩存總數的年夜小 } /** * * @param url 下載圖片的銜接 * @param position 須要顯示圖片的imgeView的Tag * @return */ public Bitmap getBitmapFromUrl(String url,int position){ //1內存中獲得圖片LRU算法 Bitmap bitmap=cache.get(url); //內存中有指定圖片 if (bitmap!=null) { Log.i("從內存中取得圖片", "從內存中取得圖片"+url); return bitmap; } //2文件中獲得圖片 bitmap=getBitmapFromFile(url); if (bitmap!=null) { Log.i("從文件中取得圖片", "從文件中取得圖片"+url); return bitmap; } //3開啟收集下載 Log.i("從收集中取得圖片", "從收集中取得圖片"+url); getBitmapFromNet(url,position); return null; } /** * 收集獲得圖片 * @param url 圖片的;鏈接地址 * @param position 須要顯示的imageview的tag */ private void getBitmapFromNet(String url, int position) { //開啟義務 executorService.execute(new RunnableTask(url,position)); } //義務接口 class RunnableTask implements Runnable{ String imageUrl; int position; private HttpURLConnection httpURLConnection; public RunnableTask(String imageUrl, int position) { this.position=position; this.imageUrl=imageUrl; } @Override public void run() { //子線程的操作,開啟收集下載圖片 try { URL url=new URL(imageUrl); //要求對象 httpURLConnection=(HttpURLConnection) url.openConnection(); //收集要求的方法 httpURLConnection.setRequestMethod("GET"); //超時的時光, httpURLConnection.setConnectTimeout(5000); //讀取超時的時光 httpURLConnection.setReadTimeout(5000); //httpURLConnection.getResponseCode()拿到最新數據 if (httpURLConnection.getResponseCode()==200) { //success get data from net;get tape InputStream inputStream=httpURLConnection.getInputStream(); //將流轉化成bitmap圖片 Bitmap bitmap=BitmapFactory.decodeStream(inputStream); //應用handler機制放入主線程中顯示 Message msg=new Message(); //須要在主線程中顯示的圖片msg.obj msg.obj=bitmap; msg.arg1=position; //為msg設置標志 msg.what=SUCCSEE; handler.sendMessage(msg); //一,將下載完後的圖片保留到內存中 cache.put(imageUrl, bitmap); //二,將下載完後的圖片保留到文件中 writeToLoce(imageUrl,bitmap); return; } } catch (Exception e) { e.printStackTrace(); } //封閉要求 finally{ //斷開辦事器 if (httpURLConnection!=null) { httpURLConnection.disconnect(); } } //發送一個空新聞 handler.obtainMessage(FAIL).sendToTarget(); } } /** * 圖片寫入cache文件夾上面的操作 * @param imageUrl * @param bitmap */ private void writeToLoce(String imageUrl, Bitmap bitmap) { try { String bitmapefilename=MD5Encoder.encode(imageUrl).substring(10); Log.i("bitmapefilename", bitmapefilename); File file=new File(cacheDir, bitmapefilename); FileOutputStream fileOutputStream =new FileOutputStream(file); //寫入文件的操作(1圖片類型2圖片質量當為100時表現不緊縮3文件流) bitmap.compress(CompressFormat.JPEG, 100, fileOutputStream); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 讀取文件中圖片的操作 * @param url 圖片的銜接地址 * @return */ private Bitmap getBitmapFromFile(String url) { try { //應用Md5對象加密截取前10個字符串 String bitmapefilename=MD5Encoder.encode(url).substring(10); /** * 在cache文件夾上面找到指定文件 * dir cache文件存儲途徑 * name 文件稱號 */ File file=new File(cacheDir, bitmapefilename); // file.mkdir(); //FileInputStream fileInputStream=new FileInputStream(file); Bitmap bitmap=BitmapFactory.decodeFile(file.getPath());//完全文件途徑 //Log.i("文件途徑", file.getPath().toString()); //2讀取以後放入內存,進步效力 cache.put(url, bitmap); return bitmap; } catch (Exception e) { e.printStackTrace(); } return null; } }
上面就是一個應用demo了,其實很簡略
package com.example.do0me;
import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.security.PublicKey; import java.util.ArrayList; import java.util.List; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.ksoap2.SoapEnvelope; import org.ksoap2.serialization.MarshalBase64; import org.ksoap2.serialization.SoapObject; import org.ksoap2.serialization.SoapSerializationEnvelope; import org.ksoap2.transport.HttpTransportSE; import org.xmlpull.v1.XmlPullParserException; import android.annotation.SuppressLint; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.os.Handler; import android.util.Base64; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.ViewTreeObserver.OnPreDrawListener; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.Toast; import com.example.util.AgbcApi; import com.example.util.ClippingPicture; import com.example.util.FastBlur; import com.example.util.ImageCachceUitl; import com.tencent.connect.avatar.c; /** * 圖片三級緩存的測試+圖片上傳 * @author double 江 * */ public class MainActivity4 extends Activity { private ImageCachceUitl imageCachceUitl; private List<String> urlList=new ArrayList<String>(); private Runnable runnable; private Handler handler =new Handler(){ public void handleMessage(android.os.Message msg) { switch (msg.what) { case ImageCachceUitl.SUCCSEE: Bitmap bitmap=(Bitmap) msg.obj; int psition=msg.arg1; //經由過程TAg加載以後的limageview ImageView imageView=(ImageView) listview.findViewWithTag(psition); if (null!=bitmap&&null!=imageView) { imageView.setImageBitmap(bitmap); } break; case ImageCachceUitl.FAIL: Toast.makeText(getApplicationContext(), "下載毛病", Toast.LENGTH_LONG).show(); default: break; } }; }; private ListView listview; private SoapObject request; private ExecutorService executorService; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main4); listview=(ListView) findViewById(R.id.imageviewlist); imageCachceUitl=new ImageCachceUitl(getApplicationContext(), handler); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg"); listview.setAdapter(new myListAdapt()); executorService=Executors.newFixedThreadPool(5); executorService.execute(new Runnable() { @Override public void run() { getImageromSdk(); } }); } public String getImageFromAndroid(String arg0,String arg1, String arg2){ Log.i("進入端口辦法", "進入端口辦法"); final String methodName="getImageFromAndroid"; final String soapAction=AgbcApi.NAMESPACE+methodName; request = new SoapObject(AgbcApi.NAMESPACE, methodName); request.addProperty("arg0",arg1); request.addProperty("arg1",arg2); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); (new MarshalBase64()).register(envelope); envelope.bodyOut = request; envelope.dotNet=false; envelope.setOutputSoapObject(request); HttpTransportSE ht = new HttpTransportSE(AgbcApi.TASKSERVICEURL); ht.debug=true; try { ht.call(soapAction, envelope); Log.i("要求", envelope.bodyIn.toString()); } catch (IOException | XmlPullParserException e) { e.printStackTrace(); } return arg1; }; @SuppressLint("SdCardPath") public void getImageromSdk(){ Log.i("進入獲得圖片辦法", "進入獲得圖片辦法"); try{ String srcUrl = "/sdcard/"; //途徑 String fileName = "1.png"; //文件名 String filrName2="2.jpg"; List<String>imageList=new ArrayList<>(); imageList.add(fileName); imageList.add(filrName2); for (int i = 0; i < imageList.size(); i++) { FileInputStream fis = new FileInputStream(srcUrl + imageList.get(i)); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[4096]; int count = 0; while((count = fis.read(buffer)) >= 0){ baos.write(buffer, 0, count); } String uploadBuffer = new String(Base64.encode(baos.toByteArray(), Base64.DEFAULT)); //停止Base64編碼 String methodName = "uploadImage"; getImageFromAndroid(methodName,imageList.get(i), uploadBuffer); //挪用webservice Log.i("connectWebService", "start"); fis.close(); } }catch(Exception e){ e.printStackTrace(); } } class myListAdapt extends BaseAdapter{ private LayoutInflater layoutInflater; ImageView list_imag; Button list_but; @Override public int getCount() { // TODO Auto-generated method stub return urlList.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return urlList.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @SuppressLint({ "InflateParams", "ViewHolder" }) @Override public View getView(final int position, View convertView, ViewGroup parent) { layoutInflater=LayoutInflater.from(getApplication()); //if (layoutInflater==null) { convertView = layoutInflater.inflate(R.layout.image_list_item, null); // } list_but=(Button) convertView.findViewById(R.id.list_but); list_imag=(ImageView) convertView.findViewById(R.id.list_imag); list_imag.setTag(position); final Bitmap bitmap=imageCachceUitl.getBitmapFromUrl(urlList.get(position), position); if (null!=bitmap) { list_imag.setImageBitmap(bitmap); } list_imag.setVisibility(View.VISIBLE); list_but.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //urlList.get(position); Log.i("獲得點擊核心", "獲得點擊核心"); // getImageromSdk(); //startRun(); new Thread(new Runnable() { @Override public void run() { getImageromSdk(); } }).start(); } }); return convertView; } } }
就為年夜家引見到這吧,年夜家漸漸消化,願望文章對年夜家有或多或少的贊助。