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Exists(fileName)) { PdfReader pdfReader = new PdfReader(fileName); for (int page = 1; page <= pdfReader.NumberOfPages; page++) ... vb.net open pdf file in new window PDF Viewer Control -VBForums
Anyone knows of a good fast & free PDF viewer control other than that provided by Adobe? It should be able to open files very fast and provide ... 4 The next day, you fix a bug in the new method and recompile the DLL 5 Your compiled EXE now fails with a Type mismatch error when it trys to retrieve the interface The step you missed here is that the new method wasn't found in the compatibility file, so VB regenerated a new IID each time you rebuilt the executable Note that depending on the number and type of edits you made between compiles, the IID might not change if you compile twice in the same IDE session You must copy the DLL that contains he new method as your compatibility file in order to lock down the IID The dilemma here is that the amount of baggage in the compatibility file and hence in your finished product grows every time you add a method Visual Basic requires all the extra information about old interface IIDs to make the DLL a binary replacement for the previous versions of the typelib VB uses the IID resources to provide marshaling support for all the previous interfaces, and uses the resources to enable the QueryInterface function to respond correctly to a request for a previous interface identifier To support marshaling on a legacy interface, VB replaces the Interface\{}\TypeLib key with an Interface\{ }\Forward key that points to the primary interface The Forward key instructs the typelib-driven marshaling engine to treat the interface the same as the currently implemented primary interface You get to carry all this compatibility information around in your finished product The resources get bigger and you add to registry overhead as you extend interfaces, the typelib grows as more and more aliases are added, and the data-driven QueryInterface implementation behind the publicly exposed objects has ever-more data to check before it can reply yes or no to an interface request Fortunately, any client compiled against a new version of the DLL won't be able to get the interface it expects from an old DLL and call a method that is not supported on the old version of the vtable Watching the changes that VB makes to a specific interface offers a lot of insights into the way VB lays out a typelib and the type of conditions against which it tries to protect you The following exercise looks at three versions of a simple class file I'll build a binary compatibility file against the first version, then modify the class by adding a function and then renaming the first function I'll. vb.net open pdf file in new window: Open a PDF file in asp. net new window | The ASP. NET Forums vb.net pdf reader control VB . NET - How to Open a PDF File in VB . NET - ViscomSoft
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Make Code128 In Visual C# Using Barcode maker for .NET .Related: EAN-8 Generating VB.NET , Generate ISBN .NET , Data Matrix Generation Excel As I mentioned, the lack of writable global data in DLLs can be dif cult when you are porting code to run on Symbian OS However, the operating system does provide a mechanism whereby a DLL can manage writable static data on a per-thread basis using thread-local storage, commonly known as TLS This allocates a single machine word of writable static data per thread for every DLL, regardless of whether the DLL uses it Obviously, the memory overhead is far less signi cant than allocating a 4 KB chunk for each DLL which uses static data However, the price of using TLS instead of direct memory access is performance; data is retrieved from TLS about 30 times slower than direct access, because the lookup involves a context switch to the kernel in order to access the data The use of TLS for per-thread access to global static data is safe because it avoids complications when the DLL is loaded into multiple processes However, for writable static data to be used by multiple threads, this approach must be extended One technique uses a server to store the data, which has the bene t of being able to use static data without the need for TLS, because it is a process The server can make this data available to its clients, which may run in multiple threads3 Of course, the inter-process context switch required to access the server also has performance implications, as I discuss in 11 The TLS slot can be used directly if you have only one machine word of data to store For extensibility, it is more likely that you ll use it to store a pointer to a struct or simple T Class which encapsulates all the data you would otherwise have declared as static Thread-local storage is usually initialized when the DLL is attached to a thread within the DLL entry point E32Dll() Typically, code is. 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