zxing qr code encoder example c# Part 2: Visual Basic for Applications in C#

Draw QR Code JIS X 0510 in C# Part 2: Visual Basic for Applications

Part 2: Visual Basic for Applications
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4
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The Visual Basic Editor might change the dates and times that you type to reflect your com puter s date and time settings. For example, #15 July 1999# might become #7/15/1999#. Note When entering dates, VBA will recognize two-digit years and uses 2029 as the cutoff year. All two-digit years from 00 to 29 are recognized as being a part of the 2000s. The remaining years, 30 to 99, are considered part of the 1900s. It is best to always include the full four-digit year to remove any ambiguities.
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VBA Programming Starter Kit
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Handling Variants and Data Type Conversions
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Variants are the catchall data type of VBA. If a variable is declared but not typed, it will be cast as a Variant data type. Variants can hold any type of data except for fixed-length strings and must be used for certain data types, such as Currency. When working with variants, VBA will attempt to use it as the data type that best fits the data being stored in the variable, but it might not always pick the right type. Assigning a variant the value of 64 * 1024 produces an error message. Because both operands, 64 and 1024, are considered Integer data types by VBA, it tries to store the result as an Integer. The actual result, 65536, is too large for an Integer data type and produces the error message. To avoid having VBA pick the wrong data type, you can convert values to a specific data type. In the preceding example, by explicitly converting one of the values to the Long data type, VBA will cast the result as a Long also and avoid the error. VBA provides functions to convert values to any numeric data type. When converting from one data type to another, keep in mind the level of precision that is used by each type and the limitations of each data type. For example, converting a Single variable, which has a decimal component, to a Long, which does not, will result in losing the decimal portion of the value, and converting the variable back to a Single will not restore the decimal portion of the original value.
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lngOffset = CLong(sngOffset)
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Table 4-8.
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Data Type Conversion Functions
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Result
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True/False (-1/0) Byte Currency
Function
CBool(expression) CByte(expression) CCur(expression)
Remarks
Any non-zero expression will result in True (-1). .5 will round to the nearest even integer. Rounding to four decimal places. Five decimals and greater is undocumented and might return unexpected results. Numeric expressions will return a date matching number of days from January 1, 100. String expressions will return an interpreted date. Rounding to the nearest floating-point number within range. Rounding to a variable number of decimal places dependent upon size of number.
continued
CDate(expression)
Date/Time
CDbl(expression) CDec(expression)
Double Decimal
Part 2: Visual Basic for Applications
4
A list of the conversion functions along with the type of data returned and rounding rules is provided in Table 4-8. The expression argument provided to the functions can be any numeric or string expression. String expressions need to be in a format that can be recog nized as a numeric value, but the specific format varies from region to region.
Microsoft Office Excel 2003 Programming Inside Out
Table 4-8.
Data Type Conversion Functions
Result
Integer Long Integer Single Variant
(continued)
Function
CInt(expression) CLng(expression) CSng(expression) CVar(expression)
Remarks
.5 will round to the nearest even integer. .5 will round to the nearest even integer. Rounding to the nearest floating-point number within the range. Numeric expressions convert to a Variant Double. Expressions enclosed within # convert to a Variant Date. All others convert to string.
Understanding Variable Scope and Lifetimes
Variables have a set lifetime and visibility within modules and procedures. A variable lifetime begins when the variable is declared and lasts until the procedure or module that declared the variable has completed execution. If a procedure calls a second procedure, the variables of the first procedure remain alive and retain their values during the execution of the second procedure. Note Although only the term variable is used in this section regarding Scope and Lifetime, the same rules apply to constants also. A variable can also have a virtually unlimited lifetime if it s declared as a static variable. Static variables within a procedure will retain their values from one call to the containing proce dure to the next so long as the module containing the procedure has not been stopped or reset. Static variables are declared using the same syntax as normal variables, replacing the statement Dim with Static. Besides having a set lifetime, variables also have a certain visibility. Variables declared within a procedure can be used only within that procedure; other procedures within the same mod ule can t see them. This means that two procedures within the same module can each declare a variable using the same name, but the two variables will be separate entities and visible only by the procedure that declared them. Consider the following code as an example:
Sub Procedure1() Dim intCounter as Integer, intResult as Integer intCounter = 87 intResult = intCounter * 74 End Sub Sub Procedure2() Dim intCounter as Integer, intResult intResult = intCounter * 74 End Sub
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