.NET/Java PDF, Tiff, Barcode SDK Library

The two most important are stdcall, which is the convention used by Windows APIs (and many others DLLs), and cdecl, which is the convention used by the C language Other implementations of the runtime may provide additional conventions to the user In the PInvoke design, there is nothing restricting the supported conventions to these two (and in fact the runtime uses the fcall convention for invoking services provided by the runtime from managed code)..

Note Attempting to move forward beyond the last row will move the cursor to after the last row and have

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This is, again, probably as big as your initial result set, so you re at 3X memory consumption Then the grid squirrels away all of the DataGridItems into the ViewState of the page After all, it will need these to restore its state when a postback occurs If it didn t hold onto these, the grid would need to be rebound on every postback 4X the size of your result set in web server memory resources is consumed Swap out X for a 250K result set and multiply that by your number of concurrent users You can see this rather innocuous operation gets very expensive very quickly So what do you do You have a number of options Which one you employ depends upon your requirements The first option is to use a DataReader instead of a DataSet A DataSet is an in-memory representation of your result set.

The additional information required to perform the function call is provided by custom attributes that are used to decorate a function prototype and inform the runtime about the signature of the exported function.

the same effect as an afterLast() call. Similarly, attempting to move backward beyond the first row will move the cursor to before the first row and have the same effect as a beforeFirst() call. Also note that calling absolute(1) is equivalent to calling first(), and calling absolute(-1) is equivalent to calling last().

Having this in memory is very nice for a number of things, such as sorting, filtering, caching, modifying, and marshaling However, in this case, you re doing none of those things In fact, a DataReader is ideal for binding operations when you re generating markup You don t need all that data in memory at once! A DataReader reads a row at a time from the database, and then discards it So as you move through the result set, you maintain a nice low memory footprint, equal to the size of one row of your result set The DataReader is not suited for all purposes You can only read forward through the DataReader once You cannot modify data You cannot cache a pointer to the DataReader or marshal it across processes When you have the need to do these things, by all means use a DataSet.

boolean relative(int row): This method moves the cursor to a position relative to the current row, either forward if you input a positive number or backward if you input a negative number. It returns false if there are no rows in the result set.

This section starts with a simple example of a DLL developed using C++ to which you will add code during your experiments using PInvoke. The CInteropDLL.h header file declares a macro defining the decorations associated with each exported function: #define CINTEROPDLL_API __declspec(dllexport) extern "C" { void CINTEROPDLL_API HelloWorld(); } The __declspec directive is specific to the Microsoft Visual C++ compiler, and other compilers may provide different ways to indicate the functions that must be exported when compiling a DLL.

Caution Attempting to position relatively from before the first row (which is the default initial position) or