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Convert text to image

Anonymous User 1828 11-Dec-2014

I got a code of convert text into image using C#. The code is given below. Now my quetion is that this function return a bitmap image. How to show it in my asp.net page. I want show the image which is returned by this function. 

private Bitmap CreateBitmapImage(string sImageText)
{
    Bitmap objBmpImage = new Bitmap(1, 1);
 
    int intWidth = 0;
    int intHeight = 0;
 
    // Create the Font object for the image text drawing.
    Font objFont = new Font("Arial", 20, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Pixel);
 
    // Create a graphics object to measure the text's width and height.
    Graphics objGraphics = Graphics.FromImage(objBmpImage);
 
    // This is where the bitmap size is determined.
    intWidth = (int)objGraphics.MeasureString(sImageText, objFont).Width;
    intHeight = (int)objGraphics.MeasureString(sImageText, objFont).Height;
 
    // Create the bmpImage again with the correct size for the text and font.
    objBmpImage = new Bitmap(objBmpImage, new Size(intWidth, intHeight)); 
    // Add the colors to the new bitmap.
    objGraphics = Graphics.FromImage(objBmpImage); 
    // Set Background color
    objGraphics.Clear(Color.White);
    objGraphics.SmoothingMode = SmoothingMode.AntiAlias;
    objGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
    objGraphics.DrawString(sImageText, objFont, new SolidBrush(Color.FromArgb(102, 102, 102)), 0, 0);
    objGraphics.Flush();
    return (objBmpImage);
}  

asp.net c# 
Updated on 11-Dec-2014
Anonymous User

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2 Answers

Barbara Jones

Barbara Jones

11-Dec-2014

there is an example of this with the following function 

public Bitmap ConvertTextToImage(string txt, string fontname, int fontsize, Color bgcolor, Color fcolor, int width, int Height)
    {
        Bitmap bmp = new Bitmap(width, Height);
        using (Graphics graphics = Graphics.FromImage(bmp))
        { 
            Font font = new Font(fontname, fontsize);
            graphics.FillRectangle(new SolidBrush(bgcolor), 0, 0, bmp.Width, bmp.Height);
            graphics.DrawString(txt, font, new SolidBrush(fcolor), 0, 0);
            graphics.Flush();
            font.Dispose();
            graphics.Dispose(); 
 
        }
        return bmp;
    }

and to use this function: 

ConvertTextToImage(txtvalue.Text, "Bookman Old Style", 10, Color.Yellow, Color.Red, txtvalue.Width, txtvalue.Height);

Tom Cruser

Tom Cruser

11-Dec-2014

reate httphandler (like image.ashx) and use something like this code: 

    public void ProcessRequest(HttpContext context)
    {
       
context.Response.ContentType = "image/png";
        var image = CreateBitmapImage("Hello world");
        var ms = new MemoryStream();
        image.Save(ms,ImageFormat.Png);
 
       
context.Response.BinaryWrite(ms.ToArray());
    }

And where you need to have your image add the link < img src="image.ashx" alt="image" /> 

Updated [based on comments]: 

http-handler: 
    public void ProcessRequest(HttpContext context)
    {
       
context.Response.ContentType = "image/png";
 
        var text =context.Request.Params["text"];
        if (text ==null) text = string.Empty;
        var image =CreateBitmapImage(text); 
       
image.Save(context.Response.OutputStream, ImageFormat.Png);
    }

page layout: 

    <asp:TextBox runat="server" ID="MyTextBox"></asp:TextBox>
    <asp:Button runat="server" OnClick="RenderImageButtonClicked" Text="Change text"/>
    <asp:Image runat="server" ID="MyTextImage" />

page event: 

    protected void RenderImageButtonClicked(object sender, EventArgs e)    {
       
MyTextImage.ImageUrl = "CreateImageText.ashx?text=" +
HttpContext.Current.Server.UrlEncode(MyTextBox.Text);
    }

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