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The action page contains a field called Photo with a value that, if output to the screen or viewed in the available debugging output, simply shows the name of the file. How do you get the file itself, and what do you do with it This Photo field involves more than just the name of the file. As we explain in the section Uploading files from browser to server, earlier in this chapter, although the idea of storing the uploaded file in a database may seem tempting, the more practical approach is to simply store the file on the server and then store the name of the file, as its known on the server, in a database field. The field where you store this name can be just another field in the record that s holding the member profile information in the example in the preceding section (name, e-mail), perhaps as just another text field called Photofile. The field just needs to be long enough to hold the name of the file. But is the name of the file the same as it was as the user sent it And where exactly is it to be stored after the upload That s where the <cffile action= upload > tag comes into play. Its purpose is to take a form field that s holding a file name that someone uploaded from a browser (actually, the posted multipart form data containing the file contents that are loaded into a temporary file on the server) and store it in a location on the server with a file name of your choosing. The following tag is the simplest version of action= upload that can store the Photo field from this example to a directory on the server called c:\CFusionMX\wwwroot\members:

After this call, ilst is unchanged, and ivec contains a copy of ilst with the exception that every element in ilst with the value 0 has the value 42 in ivec

Some systems employ common components in left-hand and right-hand orientations that require the need for a convention. Referring to Figure 45.7, how can the SRBs be uniquely identi ed NASA designates each one as illustrated in Figure 45.8.

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Suppose we want to analyze the words used in a set of children's stories For example, we might want know how many words contain six or more characters We want to count each word only once, regardless of how many times it appears or whether it appears in multiple stories We'd like to be able to print the words in size order, and we want the words to be in alphabetic order within a given size We'll assume that we have read our input and stored the text of each book in a vector of strings named words How might we solve the part of the problem that involves counting

Notice that this code uses a new filefield attribute, which holds the name of the form field that was used to store the name of the file. Notice that this is not the name of the file that someone s uploading, but the name of the field that s holding that file name.

word occurrences To solve this problem, we'd need to:

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Caution Although the value of the filefield is indeed the name of a ColdFusion form field, we don t refer to it here as form.photo nor do we specify it by placing pound signs around it, as in #photo#, otherwise you will encounter unexpected results.

In an unsigned type, all the bits represent the value If a type is defined for a particular machine to use 8 bits, then the unsigned version of this type could hold the values 0 through 255 The C++ standard does not define how signed types are represented at the bit level Instead, each compiler is free to decide how it will represent signed types These representations can affect the range of values that a signed type can hold We are guaranteed that an 8-bit signed type will hold at least the values from 127 through 127; many implementations allow values from 128 through 127 Under the most common strategy for representing signed integral types, we can view one of the bits as a sign bit Whenever the sign bit is 1, the value is negative; when it is 0, the value is either 0 or a positive number An 8-bit integral signed type represented using a sign-bit can hold values from 128 through 127

See the discussion of other CFFILE processing capabilities in the section Manipulating files on the server, earlier in this chapter, for more information about the destination attribute as well as the available attributes and mode attributes.

The type of an object determines the values that the object can hold This fact raises the question of what happens when one tries to assign a value outside the allowable range to an object of a given type The answer depends on whether the type is signed or unsigned For unsigned types, the compiler must adjust the out-of-range value so that it will fit The

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compiler does so by taking the remainder of the value modulo the number of distinct values theunsigned target type can hold An object that is an 8-bit unsigned char , for example, can hold values from 0 through 255 inclusive If we assign a value outside this range, the C++ Primer, Fourth Edition compiler actually assigns the remainder of the value modulo 256 For example, we might By the value 336 to an 8-bit attempt to assign Stanley B Lippman,Jos e Lajoie, signed char If we try to store 336 in our 8-bit Barbara E Moo unsigned char , the actual value assigned will be 80, because 80 is equal to 336 modulo 256

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