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Custom Server Controls (Asp.net with C#)

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Custom Server Controls (Asp.net with C#), stumped

rgfirefly24	30 May, 2008 - 09:23 AM Post #1
D.I.C Regular Joined: 7 Apr, 2008 Posts: 330 Thanked 5 times Dream Kudos: 150 My Contributions	ok so i have a custom server control created. Only thing is...... I have no idea how to get the image to actually display Problem: Take the captcha(shown in C# tutorials) and make it into a custom server control. I replaced Session variables with view states sense Session variables don't work in server controls, and i create the captcha just fine and save it as Captcha.jpeg. Main question in the Render Controls is there something that works with displaying images? (I am extending Image for this) and if so what exactly needs to happen for it to display? i've searched through the msdn site and every site i can find on the System.Web.UI.WebControls.Image class and just cannot figure it out.
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Jayman	30 May, 2008 - 01:19 PM Post #2
Student of Life Joined: 26 Dec, 2005 Posts: 6,839 Thanked 38 times Dream Kudos: 500 Expert In: C#, VB.NET, Java My Contributions	When you say "custom server control", do you mean a Web User Control?
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rgfirefly24	30 May, 2008 - 05:08 PM Post #3
D.I.C Regular Joined: 7 Apr, 2008 Posts: 330 Thanked 5 times Dream Kudos: 150 My Contributions	QUOTE(jayman9 @ 30 May, 2008 - 02:19 PM) When you say "custom server control", do you mean a Web User Control? no an actual server control different from a user control Custom server control vs Custom user control Also there are so many tutorials out there on creating custom server controls but none of them really touch on dealing with dynamically created images. This post has been edited by rgfirefly24: 30 May, 2008 - 05:10 PM
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Jayman	30 May, 2008 - 06:12 PM Post #4
Student of Life Joined: 26 Dec, 2005 Posts: 6,839 Thanked 38 times Dream Kudos: 500 Expert In: C#, VB.NET, Java My Contributions	Can you post the code for the custom control?
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rgfirefly24	30 May, 2008 - 07:03 PM Post #5
D.I.C Regular Joined: 7 Apr, 2008 Posts: 330 Thanked 5 times Dream Kudos: 150 My Contributions	QUOTE(jayman9 @ 30 May, 2008 - 07:12 PM) Can you post the code for the custom control? i'll have to do it when i get back to work on monday.. Totally spaced my mind to post what i've got so far lol. my main question is, though. If i use CODE bmp.save("Captcha", ImageFormat.Jpeg); will that create an image that i can store in cache and call at a later time or does that just set the stage for the image.
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Jayman	31 May, 2008 - 08:00 AM Post #6
Student of Life Joined: 26 Dec, 2005 Posts: 6,839 Thanked 38 times Dream Kudos: 500 Expert In: C#, VB.NET, Java My Contributions	Actually, that will save the image to your hard drive in the JPEG format. If that was your intention, then you have it correct. However, if you want to store it in memory, then use a MemoryStream object. CODE MemoryStream memStream = new MemoryStream(); bmp.save(memStream , ImageFormat.Jpeg); Now it is stored in memory and can be passed using a byte array to your web page. An example can be found here.
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PsychoCoder	31 May, 2008 - 08:04 AM Post #7
using DIC.Core; Joined: 26 Jul, 2007 Posts: 8,933 Thanked 118 times Dream Kudos: 8525 Expert In: VB, VB.Net, C#, SQL, ASP, ASP.Net, Web Development, HTML, CSS, Win32 API, Javascript, mySQL, J#, Boo.Net My Contributions	You can also save the image to the pages current output stream (which is the way I do it with items such as this), like this csharp bmp.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg); I'll write a short tutorial on this hopefully this weekend, on doing this with an HTTPHandler, which is what you're going to want to do with a CAPTCHA type setup
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PsychoCoder	31 May, 2008 - 09:52 AM Post #8
using DIC.Core; Joined: 26 Jul, 2007 Posts: 8,933 Thanked 118 times Dream Kudos: 8525 Expert In: VB, VB.Net, C#, SQL, ASP, ASP.Net, Web Development, HTML, CSS, Win32 API, Javascript, mySQL, J#, Boo.Net My Contributions	Well I felt productive so I got that tutorial written. It's kind of long, and lots of it wont apply to you, but I think it will definitely shine a new light on this whole CAPTCHA issue for you. Working with images via HttpHandlers
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rgfirefly24	31 May, 2008 - 11:59 AM Post #9
D.I.C Regular Joined: 7 Apr, 2008 Posts: 330 Thanked 5 times Dream Kudos: 150 My Contributions	QUOTE(PsychoCoder @ 31 May, 2008 - 10:52 AM) Well I felt productive so I got that tutorial written. It's kind of long, and lots of it wont apply to you, but I think it will definitely shine a new light on this whole CAPTCHA issue for you. Working with images via HttpHandlers thanks guys. My knowledge of C# is more basic than a baby with his first rattle. I was basically thrown on this project like a kid being thrown into water. I'll be going over your tutorial psycho probably 100 times thank you to everyone that has or will help me with my C# whoas.
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