Page 1 of 4

1. Introduction
2. BitBlt API
3. Example
4. Conclusion

Comments

1. Scotty01
   07 Feb 2007 at 04:37
   umm.... how do i fix the obstruction problem? help wanted fom any1
2. arizona2005
   10 Feb 2006 at 09:56

   
    thanks for the great material you posted but unfortunatelly for me
    it all is in VB6. Can you show me a VB.NET example for this problem
    
   thanks

3. arne croughs
   16 Nov 2005 at 21:38

   there's a sample code in vb.net on this website that changes text to html. maybe you can use it?

4. Devious Asti
   17 Jun 2005 at 12:15

   
   You can use a simple random XOR shift to do the 'encrypting'... as you probably know XOR of XOR gives original, so you can use the same for encoding/decoding provided the shift key is right. If you supply the file (binary) to this function, then it'll return encoded with the given key.
   If you pass the encoded file, it'll return the original file.
   

   
   [courier new]
   Public Function EncodeDecode(Data As String, Key As Long) As String
   On Error Resume Next
   

   
   Dim I As Long, X As Single
   Dim CharNum As Integer, RandInteger As Integer
   Dim SingleChar As String * 1
   Dim ReturnData As String
   

   
   X = Rnd(-Key)
   

   
   For I = 1 To Len(Data)
    CharNum = Asc(Mid$(Data, I, 1))
    RandInteger = Int(256 * Rnd)
    CharNum = CharNum Xor RandInteger
    
    SingleChar = Chr(CharNum)
    ReturnData = ReturnData & SingleChar
   Next I
   

   
   EncodeDecode = ReturnData
   End Function
   [/courier new]
   

   
   But how do you make a key out of password ? Convert it to a number that vastly varies according to the password...
   

   
   [courier new]
   Public Function ConvertPassKey(Key as String) As Long
   Dim I As Integer, Num As Long
   

   
   Key = LCase(Key)
   Num = 1
   For I = 1 To Len(Key)
   Num = Num + (I * Asc(Mid(Key, I, 1)))
   Next I
   

   
   ConvertPassKey = Num
   End Function
   [/courier new]
   

   
   Be VERY, VERY WARY  of the data you pass to the function. A slight shifting of even a single character will ruin the entire decoding process, and you'll get junk data!!!
   

   
   I suggest you do multiple "parity" checks before actually give it up for decoding....
   

   
   Also, encoding/decoding takes some time... that's why i prefer my tried and tested method "mangle da header!"
   Enjoy !

5. Sindu
   17 May 2005 at 04:39

   how to encrypt picture files using visual basic so that only certain people who know the password can see the picture

6. Andy GreenMax
   15 Oct 2004 at 16:10

   Be Happy....Baby

7. pankajpatel_44
   04 Apr 2004 at 07:20

   hello friends
   now i am in trouble.plz help me in convert the doc file into html format using vb
   programing code.
   plz help me i wait yours reply

8. Developer Fusion Bot
   01 Jan 1999 at 00:00

   This thread is for discussions of Skinning (BitBlt Introduction).

Apart from my school work I put most of my effort into running my joke site, I'd like to think that it makes someone smile each day. For about 1/2 a year I've been programming more and more in serv...