Add watermark information to the image in Asp.net and save it as Jpg. asp.net watermark

Add watermark information to the image in Asp.net and save it as Jpg. asp.net watermark

Using System. Drawing; using System. IO; using System. Drawing. Imaging; private void AddTextToImg (string fileName, string text) {if (! File. Exists (MapPath (fileName) {throw new FileNotFoundException ("The file don't exist! ");} If (text = string. empty) {return;} // you need to determine whether the file type is of the image type. System is not described here. drawing. image image = System. drawing. image. fromFile (MapPath (fileName); Bitmap bitmap = new Bitmap (image, image. width, image. height); Graphics g = Graphics. fromImage (bitmap); float fontSize = 12.0f; // font size float textWidth = text. length * fontSize; // the Length of the text. // The following defines a rectangular area. In the future, the white-black float rectX = 0; float rectY = 0; float rectWidth = text. length * (fontSize + 8); float rectHeight = fontSize + 8; // declare the RectangleF textArea = new RectangleF (rectX, rectY, rectWidth, rectHeight ); font font = new Font ("", fontSize); // defines the Font Brush whiteBrush = new SolidBrush (Color. white); // a White Brush that draws text in a Brush blackBrush = new SolidBrush (Color. black); // The Black brush. Use g to paint the background. fillRectangle (blackBrush, rectX, rectY, rectWidth, rectHeight); g. drawString (text, font, whiteBrush, textArea); MemoryStream MS = new MemoryStream (); // save as Jpg type bitmap. save (MS, ImageFormat. jpeg); // output the processed image. For the convenience of demonstration, the image is displayed in Response. clear (); Response. contentType = "image/jpeg"; Response. binaryWrite (ms. toArray (); g. dispose (); bitmap. dispose (); image. dispose ();}

It's easy to call,

AddTextToImg ("me.jpg", "program life http://www.manong123.com /");

Everything is okay, and I feel that. net is really powerful. These functions are a luxury in Asp, but they can be easily completed in the. Net environment!

Aspnet (C #) adds a text watermark to the bottom right corner when uploading an image.

Try
{
String filepath = uploadFile. Value; // path of the uploaded Image
String newName = DateTime. Now. ToString ("yyyyMMddHHmmss"); // The new image name.
String filehz = filepath. Substring (filepath. LastIndexOf (".") + 1). ToLowerInvariant (); // suffix
String uploadpath = Server. MapPath ("./images/update/" + newName + "." + filehz); // The Server saves the image path

If (! (UploadFile. PostedFile. ContentLength> 0 ))
{
LblErrInfo. Text = "no file selected ";
}
Else
{
If (filehz = "jpg" | filehz = "gif" | filehz = "png ")
{
If (File. Exists (uploadpath ))
{
LblErrInfo. Text = "a file with the same name already exists ";
}
Else
{
If (chboxIsInfo. Checked = true) // Add copyright information
{
If (txtLeft. Text. Trim () = "" | txtRight. Text. Trim () = "" | txtAddInfo. Text. Trim () = "")
{
Response. Write ("<script> alert ('Enter the information location (halfwidth number) and text! ') </Script> ");
... The remaining full text>

Add a watermark to aspnet

Image Information should be stored in the database? Change the path without warehouse receiving. The watermark image name can be generated based on the system time (+ Random Number). The source image name can be used as an alias.