如何将字符串变成图片输出到网页？

Question

???????????
Dim cc(10) As Byte
        Dim aa As System.Drawing.Image
        Dim bb As System.IO.Stream
        bb.Write(cc, 0, 10)
        aa.FromStream(bb)

Answer 1

here is an example, also seehttp://msdn.microsoft.com/msdnmag/issues/02/02/aspdraw/default.aspx
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<script runat="server" language="C#">
void Page_Load(object o, EventArgs e)
{
double angle = 225;
int nWidth = 400, nHeight = 400;
Bitmap objBitmap = new Bitmap(nWidth, nHeight);
Graphics g = Graphics.FromImage(objBitmap);
g.SmoothingMode = SmoothingMode.AntiAlias;



//g.FillRectangle(Brushes.White,this.ClientRectangle);
Font f = new Font("Times New Roman", 14,System.Drawing.FontStyle.Bold);

g.TranslateTransform(nWidth /2,nHeight/2);
g.FillEllipse(Brushes.Black,nHeight/-2,nHeight/-2,nHeight, nHeight);

g.DrawString("MPH",f,Brushes.Green,-26,nHeight/-4);


//g.TranslateTransform(nWidth /2,nHeight/2);
g.RotateTransform(225);
for(int x = 0; x<55;x++)
{
g.FillRectangle(Brushes.Green,-2,(nHeight/2 -2)* -1,3,15);
g.RotateTransform(5);
}
g.ResetTransform(); g.TranslateTransform(nWidth /2,nHeight/2);
g.RotateTransform(225);
int sp = 0;
for(int x = 0; x<7;x++)
{
g.FillRectangle(Brushes.Red,-3,(nHeight/2 -2)* -1,6,25);
g.DrawString(sp.ToString(),f,Brushes.Azure,(sp.ToString().Length)*(-6),(nHeight/-2) + 25);
g.RotateTransform(45);
sp += 20;
}
g.ResetTransform();

g.TranslateTransform(nWidth /2,nHeight/2); g.RotateTransform((float)angle);
Pen P = new Pen(System.Drawing.SystemColors.Desktop,14);
P.EndCap = LineCap.ArrowAnchor;
P.StartCap = LineCap.RoundAnchor;
g.DrawLine(P,0,0,0,(-1)*(nHeight/2.75F));
//P.Width = 16;
//g.DrawLine(P,0,0,0,(-1)*(nHeight/2.75F));
g.ResetTransform();

g.TranslateTransform(nWidth /2,nHeight/2); g.FillEllipse(Brushes.Black,-6,-9,14,14);
g.FillEllipse(Brushes.Red,-7,-7,14,14); P.Width = 4;
P.Color = Color.Black;
P.EndCap = LineCap.Round;
P.StartCap = LineCap.Flat;
g.DrawLine(P,nHeight/15.75F,nHeight/3.95F,nHeight/10.75F,nHeight/5.2F);

P.Color = Color.Red;
g.DrawLine(P,nHeight/15.75F,nHeight/3.95F,nHeight/15.75F,nHeight/4.6F); P.Dispose();
objBitmap.Save(Response.OutputStream, ImageFormat.Gif); objBitmap.Dispose();
g.Dispose();}
</script>

Answer 2

这是我写的一个函数，已经调试成功，显示在网页中只需要"<img src=" & picPath & ">"就可以了
/// <summary>
/// 将指定的字符串转换为指定路径的图片（字符串由Byte类型的数据组成，每个Byte由";"格开）
/// </summary>
/// <param name="str">字符串数据</param>
/// <param name="picPath">生成的图片路径</param>
public static void ConvertStringToPic(string ImageContent,string picPath)
{
string[] strImg=ImageContent.Split(';');
byte[] picbyte=new Byte[strImg.Length];
for(int i=0;i<strImg.Length-1;i++)
{
picbyte[i]=Convert.ToByte(strImg[i]);
}
try
{

if (System.IO.File.Exists(picPath)) 
{
System.IO.File.Delete(picPath);
}
System.IO.FileStream FS=new System.IO.FileStream(picPath,System.IO.FileMode.Create);
FS.Write(picbyte,0,strImg.Length);
FS.Close();
}
catch
{}
}

Answer 3

a.aspx?str=hello
参数是什么, 就出什么字的图片<%@Page language="c#" contenttype="image/jpeg" %>
<%@import namespace="System.Drawing"%>
<%@import namespace="System.Drawing.Imaging"%>
<%@import namespace="System.Drawing.Drawing2D"%>
<%
String str = Request.Params["str"];
if(str == ""||str == null)
str = "请输入参数str";
Response.Clear();
Bitmap img = new Bitmap(240, 30, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(img);
g.Clear(Color.Green);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.DrawString(str, new Font("黑体", 16, FontStyle.Bold), new SolidBrush(Color.White), new Point(1,1));
g.FillRectangle(new LinearGradientBrush(new Point(0,0), new Point(240, 30), Color.FromArgb(0,0,0,0), Color.FromArgb(255,255,255,255)), 0,0,240,30);
img.Save(Response.OutputStream, ImageFormat.Jpeg);
g.Dispose();
img.Dispose();
Response.End();
%>