zxing c# qr code sample Part 4: Advanced VBA in C#.NET

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Part 4: Advanced VBA
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The following line consists entirely of nonprinting characters:
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The TRIM function is similar to the CLEAN function in that both functions get rid of unwanted characters, but the TRIM function strips away unwanted white space (spaces, tabs, carriage returns, line breaks, and so on) before the first alphanumeric character and after the last alphanumeric character in the string. The TRIM function also strips away all but one space between words. Again, these extraneous characters can sneak in as an artifact of
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Manipulating Data with VBA untranslated formatting instructions, or the extra space might have been added because the fields in the file had fixed lengths and the originating program padded the string with spaces to make up the difference. Because CLEAN and TRIM are useful worksheet functions, the fine minds at Microsoft decided to let you use them in Excel VBA. You can call the CLEAN and TRIM functions, plus a host of other useful worksheet functions, by adding the name of the desired function as a property of the Application.WorksheetFunction object. Such calls would look like this:
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ActiveCell.Value = Application.WorksheetFunction.Clean(ActiveCell.Value) ActiveCell.Value = Application.WorksheetFunction.Trim(ActiveCell.Value)
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Determining the Number of Characters in a String
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Another of the basic text-processing operations that you can perform in Excel VBA is to determine the number of characters in a string, which you do using the LEN function. And, just as the ISTEXT function is useful for validating data, you can use the LEN function to ensure the data you re inputting, importing, or exporting is of the expected length. One example of an occasion when determining that data is of a particular length is if you re typing in International Standard Book Numbers (ISBNs), which are used to identify books. An ISBN is exactly 10 characters long, so if you or a colleague is typing in the title, the authors, the ISBN, and the price of every book in your company s library, you should make sure the ISBNs are of the correct length. Although ISBNs are one example when verifying the length of worksheet or UserForm data would come in handy, the applications are nearly infinite. If your order or customer numbers are all of a specified length, if your product codes are eight characters long but your customer codes are nine characters long, or if you want to make sure no stray digits were mistakenly added to a phone number, you can use the LEN function to verify that your rules are being followed. The following code verifies the value in the active cell to ensure the product code contained in the cell is exactly 10 characters in length:
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If LEN(ActiveCell.Value) <> 10 Then MsgBox ("The product code in this cell is not of the required length.") ActiveCell.Value = "Error" End If
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If you work with older database management systems, or with a database that has set charac ter lengths for each of its fields, you should be sure to add a validation rule to a column so that you can ensure every entry was read in correctly. And, although many databases are small enough that you can waste a bit of storage by allocating more space than is strictly nec essary to hold the field s value, it s a good idea to limit the size of every field (with the possible exception of a comment field) to the minimum possible number of characters. Another good use for the LEN function is to guarantee that the passwords your colleagues assign to workbooks and worksheets are of a minimum length. As mentioned in 7, the Excel password protection scheme won t prevent your data from being compromised, but you can make an attacker s job much more time-consuming by assigning longer passwords. 197
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