zxing qr code encoder example c# Developing Projects with the Project Explorer in C#.NET

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Developing Projects with the Project Explorer
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You use the Project Explorer to manage your projects and modules within the Visual Basic Editor. It lets you create new modules, delete modules, and copy modules from one project to another. About the only thing you can t do in the Project Explorer is create a new project (for that, you need to create a new workbook), but you can use the Project Explorer to manage the contents of the project.
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Creating VBA Modules
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All macros and procedures are stored within a VBA module. You can have more than one module within a project, and that might even be necessary depending upon the complexity of your project. To create a new module, click Insert and then click Module, Class Module, or UserForm, depending on the type of module you want to create. Figure 4-9 shows a recently created blank module in a project. Once you ve created the module, you can begin adding procedures or designing the user form. Another option is to import a module from a text file. By clicking File, Import File, you can select a text file that includes the code to be used in other modules or user forms. The Visual Basic Editor creates a new module, so unless the code you import is a complete procedure it won t run until you add the Sub End Sub notation.
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Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out
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Figure 4-9.
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Creating a new module gives you a place to put your code.
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Deleting VBA Modules
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If a module is no longer needed within a project, you can delete it. Select the module you want to remove from within the Project Explorer, and then click File, Remove Module Name. Module Name will change to reflect the name of the module that is currently selected. Before deleting the module, the Visual Basic Editor will ask if you want to export the module to a text file, as shown in Figure 4-10. This gives you an opportunity to backup a module before it is completely removed.
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Figure 4-10. It s probably a good idea to take the opportunity presented by the Export File dialog box to save deleted code in a text file, just in case.
You can export a module at any time by clicking File, Export. 56
Part 2: Visual Basic for Applications
VBA Programming Starter Kit
Copying Modules Between Projects
The Project Explorer provides an easy method for copying modules from one project to another. To do so, open the source project and the destination project and then, from within the Project Explorer window, click the module you want to copy from the source project and drag it to the destination module. Once the mouse pointer is within the destination project, it will change appearance from a circle with a line through it to an arrow with an outline box and plus sign beneath it, as shown in Figure 4-11.
Figure 4-11. The mouse pointer changes to indicate a valid drop-off point when copying modules.
If you copy a module into a project that already has a module of the same name, the
Visual Basic Editor will rename the module by adding a number behind the name, starting
with 1 and incrementing each time a module of the same name is copied. Also, if there are no
modules of the type you re moving, the Visual Basic Editor will create a module and the
appropriate folder to hold it.
Declaring Variables, Constants, and Data Types
Most procedures will need some type of temporary storage area to manipulate data and hold it for later use. VBA stores this data in memory using a variable. It is also possible to store in memory a value that is not going to change; these values are called constants. Variables can hold values of different data types, which are specified when the variable is named, or declared. Variables should always be declared to reduce the chance of introducing bugs in the procedure and to properly allocate the amount of storage needed to hold the variable.
Part 2: Visual Basic for Applications
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Declaring Variables
Variables are declared within a procedure by using the Dim, or dimension, statement. The most common usage of the Dim statement is
Dim varname as type
This statement explicitly declares a variable named varname as a variable of type. Multiple variables can be declared on one line by separating them with a comma, like this:
Dim varname1 as type, varname2 as type, ...
Defining Data Types
When variables are declared, they should be declared as a specific data type. This data type determines the values that can be stored within the variable and how much memory is required to store the value. VBA provides different data types to handle numbers, strings, dates and times, Boolean values, and objects. You can even declare your own data type when needed. The majority of the data types available in VBA are numeric types, each of which handles a different range of values with varying amounts of precision. The numeric data types along with their specifications are listed in Table 4-7.
Table 4-7.
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