Class wwCodeUpdate - West Wind Web Connection

Class wwCodeUpdate

The wwCodeUpdate class can be used in Fat Client applications to perform application updates over the Web. The class provides the version checking tools to check against an XML version resource file, the ability to download the update and the ability to swap out the running application by executing a script file to update the running application file and any others that might have changed.

In addition to the information in this help topic tree please see: http://www.west-wind.com/presentations/wwCodeupdate/codeupdate.asp

for a detailed article on this class and the application update process.

Based on:
Relation
Stored in:
wwCodeupdate.prg
Dependencies:
wwUtils.prg
wwHTTP.prg
wwDialogs.vcx
wconnect.h

Class Members

Member		Description
	CreateHTTPClient	Creates an instance of the oHTTP member of the class. o.CreateHTTPClient()
	DownloadUpdate	Downloads the actual update file from the Web site. o.DownloadUpdate(llCheckforExistingVersion)
	GetVersionInfo	Retrieves the online XML resource specified in cVersionUrl and parses the content into object properties. o.GetVersionInfo()
	RunUpdateExe	This method fires the Update Exe or script application by taking a full command line to the external app or script. Runs the app and then QUITs the current instance of Visual FoxPro. o.RunUpdateExe(lcUpdateExe)
	SwapExes	Hot swaps an EXE file by running a Zip Exe file that unzips the update files. o.SwapExes(lcUpdateFile)
	cApplicationName	Name of the application. Used for display in dialogs.
	cDownloadPath
	cErrorMsg	Error Message if a method failed or lError is .T.
	cExeFile	Name of the main application Exe file.
	cOnlineFileUrl	The URL to the update file to download. Set after a successful call to GetVersionInfo().
	cUserMessage	User message retrieved from the XML resource file.
	cVersionType	Type of the version to be retured in vOnlineVersion, vOnlineMinVersion and as the return value from GetVersionInfo().
	cVersionUrl	The URL to the online XML version resource file.
	cXML	Contains the full XML resource string after a call to GetVersionInfo().
	lError	Error flag. Check cErrorMsg if .T.
	lShowDialog	Determines whether the file download displays a progress dialog.
	nConnectTimeout	The HTTP timeout before a request is considered cancelled. Applies to wait time connecting and downloading.
	nFileSize	The filesize retrieved from the XML resource file, so you can display info about the size of the file before actually grabbing it.
	oHTTP	Reference to an wwHTTP object that can be configured after a call to CreateHTTPClient().
	vOnlineMinVersion	Contains the minimum version number that is allowed to update after a call to GetVersionInfo(). Value is either string or numeric depending on the cVersionType setting.
	vOnlineVersion	Contains the version number after a call to GetVersionInfo(). Value is either string or numeric depending on the cVersionType setting.