后端开发|C#.Net教程
上传图片并生成可带版权信息的缩略图
后端开发-C#.Net教程
代码如下:
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void Page_Load(Object sender, EventArgs e) { if(!Page.IsPostBack) { ImgPreview.Visible=false; } } void GetThumbnailImage(int width,int height,string strInfo,int left,int right) { string file="Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf(\\\)+1); string newfile="Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf(\\\)+1)+".jpg"; string strAdd=strInfo; System.Drawing.Image oldimage = System.Drawing.Image.FromFile(Server.MapPath(file)); System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage(width, height,new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero); Response.Clear(); Bitmap output=new Bitmap(thumbnailImage); Graphics g=Graphics.FromImage(output); g.DrawString(strAdd,new Font("Courier New", 14),new SolidBrush(Color.Red),left,right); output.Save(Server.MapPath(newfile),System.Drawing.Imaging.ImageFormat.Jpeg); Response.ContentType = "image/gif"; ImgPreview.Visible=true; ImgPreview.ImageUrl=newfile; } bool ThumbnailCallback() { return true; } void Button_Click(object sender, EventArgs e) { int width,height,left,right; string strAddInfo=txtAddInfo.Text; width=Int32.Parse(txtWidth.Text); height=Int32.Parse(txtHeight.Text); left=Int32.Parse(txtLeft.Text); right=Int32.Parse(txtRight.Text); if(!(uploadFile.PostedFile.ContentLength>0)) { lblErrInfo.Text="没有选择文件"; } else { string path = Server.MapPath("./Uploads/"+uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf(\\\)+1)); if(File.Exists(path)) { lblErrInfo.Text="已经有同名文件"; } else { uploadFile.PostedFile.SaveAs(path); GetThumbnailImage(width,height,strAddInfo,left,right); } } }
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width:100 height:150
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添加信息：
信息位置：left:10 right:135
