birt barcode font C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES in vb

Implement QR-Code in vb C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES

An array constructor takes as many parameters as there are undefined lower bounds and sizes of the array being created. (Hence, the same number of integer values must be loaded on the stack before newobj is invoked.) In the example just shown, both lower bounds of the two-dimensional array are specified in the array type, so we need to specify only two sizes. initobj <token> (0xFE 0x15). Initialize the value type instance. This instruction takes an instance pointer a managed pointer to a value type instance from the stack. <token> specifies the value type and must be a valid TypeDef, TypeRef, or TypeSpec token. The initobj instruction zeroes all the fields of the value type instance, so if you need more sophisticated initialization, you might want to define .ctor and call it instead. castclass <token> (0x74). Cast a class instance to the class specified by <token>. This instruction takes the object reference to the original instance from the stack and pushes the object reference to the cast instance on the stack. <token> must be a valid TypeDef, TypeRef, or TypeSpec token. If the specified cast is illegal, the instruction throws InvalidCast exception. isinst <token> (0x75). Check to see whether the object reference on the stack is an instance of the class specified by <token>. <token> must be a valid TypeDef, TypeRef, or TypeSpec token. This instruction takes the object reference from the stack and pushes the result on the stack. If the check succeeds, the result is an object reference, as if castclass had been invoked; otherwise, the result is a null reference, as if ldnull had been invoked. This instruction does not throw exceptions. The check succeeds under the following conditions: If <token> indicates a class and the object reference on the stack is an instance of this class or of any class derived from it If <token> indicates an interface and the object reference is an instance of the class implementing this interface If <token> indicates a value type and the object reference is a boxed instance of this value type box <token> (0x8C). Convert a value type instance to an object reference. <token> specifies the value type being converted and must be a valid TypeDef, TypeRef, or TypeSpec token. This instruction takes the value type instance from the stack, creates a new instance of the type as an object, and pushes the object reference to this instance on the stack. Since a copy of the instance is created, all further changes of the original instance of the value type have no effect on the boxed instance. unbox <token> (0x79). Revert a boxed value type instance from the object form to its value type form. <token> specifies the value type being converted and must be a valid TypeDef, TypeRef, or TypeSpec token. This instruction takes an object reference from the stack and pushes back a managed pointer to the value type instance. As you can see, unbox is asymmetric to the box instruction: box takes an instance of value type, and unbox returns a managed pointer to such instance; box creates a copy of the instance, and unbox returns a pointer to the value part of the existing instance.

want to enable some features, such as selecting items from the Pivot field drop-down lists, and disable other features, such as changing the layout, you can use programming, as described in 11.

Figure 7-21. Relative accessibility of the various member access modifiers Table 7-2 lists the access modifiers down the left side of the table and the categories of classes across the top. Derived refers to classes derived from the class declaring the member. Nonderived means classes not derived from the class declaring the member. A check in a cell means that the category of class can access members with the corresponding modifier. Table 7-2. Summary of Member Accessibility

Figure 4-13. A page leveraging out-of-band callbacks running in Firefox Even though all of the features you ve looked at in this chapter are cross-browser compatible, this feature is worthy of note: In the past, it would have been safe to assume it was IE only. The new TreeView Web Form control also makes use of this callback infrastructure, meaning that this new control is also cross-browser compatible.

at this case in 13 Partitioning. Additionally, other administrative operations such as FLASHBACK TABLE and ALTER TABLE SHRINK may change rowids assigned to rows as well.

the pivot table. However, if the reference is to an Excel Table, or to a dynamic range in the other workbook, that workbook must be open to refresh the pivot table.