如何在上傳的圖片上寫字
2024-07-21 02:23:10
供稿：網(wǎng)友
很多時(shí)候需要在用戶上傳的圖片上加上版權(quán)或者一些其他的附加文字信息，如何實(shí)現(xiàn)這樣的功能，下面帖個(gè)簡單實(shí)現(xiàn)的例子，起到拋磚引玉的作用。
<%@ page language="c#" debug="true" trace="true"%>
<%@ import namespace="system.io" %>
<%@ import namespace="system.drawing" %>
<%@ import namespace="system.drawing.imaging" %>
<html>
<script runat =server>
void uploadbtn_click(object sender, eventargs e) {
string filename;
string filename1;
string[] filename2;
int q;
filename=uploadfile.postedfile.filename ;
filename2=filename.split(new char[] {'//'});
q=filename2.getupperbound(0);
filename1=filename2[q];
dis.text="上傳文件名："+filename1+"<br>";
uploadfile.postedfile.saveas(server.mappath(filename1));
imageeditor.visible = true;
dis.text+="文件大小："+uploadfile.postedfile.contentlength+"字節(jié)數(shù)";
image1.src=filename1;
}
void updatebtn_click(object sender, eventargs e) {
string filename1;
filename1=image1.src;
system.drawing.image image = system.drawing.image.fromfile(server.mappath(filename1));
system.drawing.image newimage = new bitmap(image.width, image.height, pixelformat.format32bpprgb);
graphics g = graphics.fromimage(newimage);
g.drawimage(image,0,0,image.width,image.height);
font f = new font(fonttype.selecteditem.text, int32.parse(fontsize.selecteditem.text));
brush b = new solidbrush(color.red);
g.drawstring(caption.text, f, b, 10, 140);
g.dispose();
system.drawing.image thumbimage = newimage.getthumbnailimage(int32.parse(width.text),int32.parse
(height.text),null,0);
image.dispose();
thumbimage.save(server.mappath(filename1), imageformat.jpeg);
image1.src=filename1;
caption.text="";
}
</script>
<body>
<asp:label id="dis" runat=server/>
<form enctype="multipart/form-data" runat=server>
選擇上傳文件: <input id="uploadfile" type=file runat=server>
<asp:button text="upload me!" onclick="uploadbtn_click" runat=server/>
<hr>
<asp:panel id="imageeditor" visible=false runat=server>
<img id="image1" src="" runat="server"/>
圖像寬度: <asp:textbox id="width" runat=server/>
圖像高度: <asp:textbox id="height" runat=server/> <br>
文本標(biāo)題: <asp:textbox id="caption" runat=server/>
標(biāo)題字號: <asp:dropdownlist id="fontsize" runat=server>
<asp:listitem>14</asp:listitem>
<asp:listitem>18</asp:listitem>
<asp:listitem>26</asp:listitem>
<asp:listitem>36</asp:listitem>
<asp:listitem>48</asp:listitem>
<asp:listitem>62</asp:listitem>
</asp:dropdownlist>
標(biāo)題字體: <asp:dropdownlist id="fonttype" runat=server>
<asp:listitem>黑體</asp:listitem>
<asp:listitem>仿宋</asp:listitem>
<asp:listitem>隸書</asp:listitem>
<asp:listitem>楷書</asp:listitem>
<asp:listitem>彩云</asp:listitem>
<asp:listitem>新魏</asp:listitem>
</asp:dropdownlist>
<asp:button text="update image" onclick="updatebtn_click" runat=server/>
</asp:panel>
</form>
</body>
</html>
