Question: (Regarding the Chilkat Diffie-Hellman Component/Library) If it is possible, we´d like to know what algorithm is used to generate random numbers because one of our clients is very strict with security and they demand us this information. Answer: The most difficult problem in implementing a good random number generator is in generating a good seed value for a starting […]
Question: Can the Chilkat library be used to decrypt a large file (
In a nutshell, a GZIP file consists of a header followed by compressed data (using the “deflate” compression algorithm), followed by a trailer. The GZIP file format is specified here: GZIP file format. The Chilkat GZip component’s Compress* and Uncompress* methods read and write the GZIP file format. Data passed to an Uncompress* method should contain the header, compressed data, […]
Question: I instantiated the HtmlToXml component correctly but the DropTagType method did not drop the HTML tags as I expected: Htmltoxml.DropTagType(“span font p I”) Htmltoxml.DropTagType(“<span> <font> <p> <I>”) Answer: Call DropTagType once for each type of tag to be dropped (i.e. discarded) from the output. The tag string is case-insensitive: Htmltoxml.DropTagType(“span”) Htmltoxml.DropTagType(“i”) Htmltoxml.DropTagType(“p”) Htmltoxml.DropTagType(“font”)
Question: Looks to me like sendmail is returning true before the message has been sent but I’m sure you’ll tell me that there is no way this can happen… Answer: The SendEmail method returned true after the email was successfully handed over to the SMTP server. When the SMTP server decides to actually forward the email onward to its destination […]
Question: Do you have any examples of using the Chilkat Encryption component with X509 Digital Certificates to encrypt and decrypt data ? Answer: To use an X509 certificate, the CryptAlgorithm is set to “PKI” and you set the certificate by calling SetEncryptCert. The encryption algorithm may be controlled by using a Chilkat CSP object and calling SetCSP. Here’s a quick […]
Question: Does the Crypt2 Component support 3DES ?? Setting “CryptAlgorithm” to “3des” or “des” does not change the encoded output when the “EncryptStringENC” method is used. Answer: Yes. The CryptAlgorithm should be set to “DES” (case-insensitive). The KeyLength property determines if it is DES (56 or 64), 3DES (112 or 128) or 2-Key TDES (168 or 192). Each byte in […]
Question: My HTML page requires authentication to access. If I try to download it with Chilkat MHT, I get the following text in the mht.LastErrorText property: ChilkatLog: GetMHT: version: 5.2.1 DllDate: Sep 12 2008 Username: *** Component: .NET 2.0 url: http://***.aspx root_url: http://*** base_url: http://*** url: http://***.aspx Not yet connected to web server. Need to establish connection. httpServer: *** port: […]
You may see the following message in the Chilkat HTTP component’s LastErrorText property: “Not yet connected to web server. Need to establish connection.” The presence of content in LastErrorText does not indicate an error. Errors are generally indicated by either false/0 return values, or NULL reference return values. The LastErrorText (or LastErrorHtml / LastErrorXml) will contain information about what transpired […]
This post clarifies the meaning of “child”. An XML node may have 0 or more child nodes. A child node is a direct descendent of the parent (i.e. it is one level below the parent node). Methods such as NumChildrenHavingTag will return the number of direct descendents (i.e. nodes that are exactly one level below the calling node) that match […]