谁会用Response.BinaryWrite?

bgold 2000-04-03 11:11:00

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bgold 2000-04-03

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明白，谢了！

929 2000-04-03

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BINARYWRITE是RESPONSE用来传达室送二进制数据的一种方法。一般都是由一个产生二进制数据的组件或由数据库的BLOB类型字段形成二进制数据。然后由BINARYWRITE发出。但是在发出之前，为了让浏览器识别，需要将CONTENTTYPE设置成对应的二进制说明格式。比如传送JPEG图象，须指明为IMAGE/JPEG类型。
<%@ LANGUAGE="VBSCRIPT" %> <%
' Clear out the existing HTTP header information Response.Expires = 0
Response.Buffer = TRUE Response.Clear
' Change the HTTP header to reflect that an image is being passed.
Response.ContentType = "image/gif"
Set cn = Server.CreateObject("ADODB.Connection")
' The following open line assumes you have set up a System DataSource
' by the name of myDSN. cn.Open "DSN=myDSN;UID=sa;PWD=;DATABASE=pubs"
Set rs = cn.Execute("SELECT logo FROM pub_info WHERE pub_id='0736'")
Response.BinaryWrite rs("logo") Response.End %>
可在MSDN中以BINARYWRITE进行查询。

图片的常见存储与读取凡是有以下几种: 存储图片:以二进制的形式存储图片时，要把数据库中的字段设置为Image数据类型(SQL Server),存储的数据是Byte[]. 1.参数是图片路径:返回Byte[]类型: public byte[] GetPictureData(string imagepath) { /**/////根据图片文件的路径使用文件流打开，并保存为byte[] FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重载方法 byte[] byData = new byte[fs.Length]; fs.Read(byData, 0, byData.Length); fs.Close(); return byData; }2.参数类型是Image对象，返回Byte[]类型: public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto) { //将Image转换成流数据，并保存为byte[] MemoryStream mstream = new MemoryStream(); imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp); byte[] byData = new Byte[mstream.Length]; mstream.Position = 0; mstream.Read(byData, 0, byData.Length); mstream.Close(); return byData; }好了,这样通过上面的方法就可以把图片转换成Byte[]对象，然后就把这个对象保存到数据库中去就实现了把图片的二进制格式保存到数据库中去了。下面我就谈谈如何把数据库中的图片读取出来，实际上这是一个相反的过程。读取图片:把相应的字段转换成Byte[]即：Byte[] bt=(Byte[])XXXX 1.参数是Byte[]类型，返回值是Image对象: public System.Drawing.Image ReturnPhoto(byte[] streamByte) { System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte); System.Drawing.Image img = System.Drawing.Image.FromStream(ms); return img; }2.参数是Byte[] 类型，没有返回值，这是针对asp.net中把图片从输出到网页上(Response.BinaryWrite) public void WritePhoto(byte[] streamByte) { // Response.ContentType 的默认值为默认值为“text/html” Response.ContentType = "image/GIF"; //图片输出的类型有: image/GIF image/JPEG Response.BinaryWrite(streamByte); }补充: 针对Response.ContentType的值，除了针对图片的类型外，还有其他的类型： Response.ContentType = "application/msword"; Response.ContentType = "application/x-shockwave-flash"; Response.ContentType = "application/vnd.ms-excel";另外可以针对不同的格式，用不同的输出类型以适合不同的类型: switch (dataread("document_type")) { case "doc": Response.ContentType = "application/msword"; case "swf": Response.ContentType = "application/x-shockwave-flash"; case "xls": Response.ContentType = "application/vnd.ms-excel"; case "gif": Response.ContentType = "image/gif"; case "Jpg": Response.ContentType = "image/jpeg"; }

protected void Page_Load(object sender, EventArgs e) { VryImgGen gen = new VryImgGen(); string verifyCode = gen.CreateVerifyCode(5, 1); Session["VerifyCode"] = verifyCode.ToUpper(); System.Drawing.Bitmap bitmap = gen.CreateImage(verifyCode); System.IO.MemoryStream ms = new System.IO.MemoryStream(); bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.Clear(); Response.ContentType = "image/Png"; Response.BinaryWrite(ms.GetBuffer()); bitmap.Dispose(); ms.Dispose(); ms.Close(); Response.End(); }

今天刚刚编译的二维码类库，绝对支持中文！使用方法（先引用dll）示例： QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; qrCodeEncoder.QRCodeScale = 4; qrCodeEncoder.QRCodeVersion = 8; qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; String data ="Hello 二维码!"; System.Drawing.Bitmap image = qrCodeEncoder.Encode(data); System.IO.MemoryStream MStream = new System.IO.MemoryStream(); image.Save(MStream, System.Drawing.Imaging.ImageFormat.Gif); Response.ClearContent(); Response.ContentType = "image/Gif";//png , jpg都可 Response.BinaryWrite(MStream.ToArray());

QRCode二维码维码支持中文Asp.Net(C#),是VS2010的项目，VS2008、VS2005也可以用，需要在你的项目里引用ThoughtWorks.QRCode.dll，在二维码生成页面内加上下面的代码： using System.Drawing.Imaging; using ThoughtWorks.QRCode.Codec; using ThoughtWorks.QRCode.Codec.Data; using ThoughtWorks.QRCode.Codec.Util; QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; qrCodeEncoder.QRCodeScale = 4; qrCodeEncoder.QRCodeVersion = 8; qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; String data = "Hello 二维码!"; System.Drawing.Bitmap image = qrCodeEncoder.Encode(data); System.IO.MemoryStream MStream = new System.IO.MemoryStream(); image.Save(MStream, System.Drawing.Imaging.ImageFormat.Gif); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(MStream.ToArray()); 本项目100%可用。

1、首先将ThoughtWorks.QRCode.dll引用到项目中。 2、using ThoughtWorks.QRCode.Codec; //在需要调用的界面引用命名空间 /// /// 根据用户名返回一个二进制数组 /// /// public byte[] CreateQRcode(string UserName) { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; qrCodeEncoder.QRCodeScale = 4; qrCodeEncoder.QRCodeVersion = 8; qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; String data = UserName; System.Drawing.Bitmap image = qrCodeEncoder.Encode(data); System.IO.MemoryStream MStream = new System.IO.MemoryStream(); image.Save(MStream, System.Drawing.Imaging.ImageFormat.Jpeg); return MStream.ToArray(); } //调用二维码函数 public void QRcode() { byte[] img = CreateQRcode("张三"); if(img.Length >0 ) { Response.ClearContent(); Response.ContentType = "image/jpeg"; Response.BinaryWrite(img); } }

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