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Polymorphics/Polymorphs A polymorph virus attempts to change its signature to prevent detection by antivirus programs, usually by continually scrambling a bit of useless code Fortunately, the scrambling code itself can be identified and used as the signature once the antivirus makers become aware of the virus One technique used to combat unknown polymorphs is to have the antivirus program create a checksum on every file in the drive A checksum in this context is a number generated by the software based on the contents of the file rather than the name, date, or size of that file The algorithms for creating these checksums vary among different antivirus programs (they are also usually kept secret to help prevent virus makers from coming up with ways to beat them) Every time a program is run, the antivirus program calculates a new checksum and compares it with the earlier calculation If the checksums are different, it is a sure sign of a virus Stealth The term stealth is more of a concept than an actual virus function Most stealth virus programs are boot sector viruses that use various methods to hide from antivirus software The AntiEXE stealth virus will hook on to a little-known but often-used software interrupt, for example, running only when that interrupt runs Others make copies of innocent-looking files Virus Prevention Tips The secret to preventing damage from a malicious software attack is to keep from getting a virus in the first place As discussed earlier, all good antivirus programs include a virus shield that will scan e-mail, downloads, running programs, and so on automatically (see Figure 1916) Use your antivirus shield It is also a good idea to scan PCs daily for possible virus attacks All antivirus programs include terminate-and-stay resident programs (TSRs) that will run every time the PC is booted Last but not least, know the source of any software before you load it While the chance of commercial, shrink-wrapped software having a virus is virtually nil (there have been a couple of well-publicized exceptions), that illegal copy of Unreal Tournament you borrowed from a local hacker should definitely be inspected with care Keep your antivirus program updated New viruses appear daily, and your program needs to know about them The list of viruses your antivirus program can recognize is called the definition file , and you must keep that definition file up to date Fortunately, most antivirus programs will update themselves automatically Get into the habit of keeping around an antivirus CD-R a bootable, CD-R disc with a copy of an antivirus program If you suspect a virus, use the disc, even if your antivirus program claims to have eliminated the virus Turn off the PC and reboot it from. vb.net pdfsharp pdf to image How To Convert * . pdf File To An Image File. - VB . NET | Dream.In.Code
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plz how to convert PDF to image file in vb . net i need to convert a pdf file ... If you' re looking for a " free " solution, you could take a look at this ... things will look a bit different Figure 943 shows the extended partition as free space because it has no logical drive yet As you can easily guess from Figure 944, to create a logical drive, simply right-click in that extended partition and choose New Logical Drive Disk Management will fire up the New Partition Wizard again, this time with the option to create a logical drive (Figure 945) When you create a logical drive, the New Partition Wizard automatically gives you the same options to format the partition using one of the Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601) NOTE A graphical warning message is displayed whenever you run Scregeditwsf commands To avoid this, make sure that when you open a command prompt to run these commands, you change the current directory to %WINDIR%\System32 and run the command using CScript For example, you could run cscriptexe scregeditwsf /AU 4 vb.net ghostscript pdf to image How to convert PDF to JPG | WinForms - PDF - Syncfusion
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