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The simple example in the preceding section would store the name of the file exactly as it is named on the client s machine (although it would now be stored on the specified directory on the server) The problem is, what if another client submits another photo with the same name You have no control over what people call files on their workstations, and making them rename it for uploading to the server is tedious and possibly unacceptable The CFFILE tag offers a solution in its nameconflict attribute If not specified, it defaults to a value of error, which means that if the CFFILE tries to store a file on the server directory and another file of the same name is already there, the CFFILE tag fails.

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For the unsignedPublisher:Addison Wesley is always out of range An object of unsigned type types, a negative value may never hold Professional a negative value Some languages make it illegal to assign a negative value Pub Date: February 14, 2005 to an unsigned type, but C++ does not

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Although you could anticipate that error and handle it by using CFTRY/CFCATCH processing (see 21 for more information), and you can also use several result variables to determine what sort of problem occurred, using any of serveral alternative values for the nameconflict attribute may make more sense in preventing the problem First, you can use nameconflict= skip , although it may not prove very useful It doesn t generate an error if a conflict arises, but it also doesn t store the file on the server in such a case Next, you can try nameconflict= overwrite , which simply replaces the current file on the server with the newer one of the same name.

Print ISBN: 0-201-72148-1 Pages: 912

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For some applications, this approach is appropriate, such as a case where the client is naming the files in such a way that they re unique to him, but a different version is being uploaded which should always replace any previous one The final alternative, and one that probably makes the most sense for an application such as your member-photo upload process, is nameconflict= makeunique This option automatically generates a unique file name for the file stored on the server As we mention later in this chapter, several variables are available for use after executing this form of the CFFILE tag, and one of those, serverfile, holds the name of the file as generated by the server You learn more about those variables later in this chapter For now, just know that a variable called cffileserverfile, which holds the file name (and extension), is available.

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