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Rating 3.7 stars (53) You might think that the stack pointer is just offset by the number of local variables, but that isn't always the case The Visual C++ compiler does an excellent job of optimizing so that the stack pointer isn't in the same place with different optimization flags set Although you might declare a variable as a local variable, the compiler can optimize the variable by storing it in a register so that it doesn't even appear on the stack I needed a guaranteed way to get the stack pointer no matter what optimizations were set At this point, I started thinking naked (no, not me without clothes): why not declare the hook functions as __declspec(naked) and create my own prolog and epilog code With this approach, I'd have complete control over ESP no matter what optimization settings were used. vb.net itextsharp pdfreader: PDF Viewer SDK Control - Visual Studio Marketplace vb.net pdf viewer PDF Viewer Control Without Acrobat Reader Installed - CodeProject
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19 Jun 2009 ... NET PDF Viewer control that is not dependent on Acrobat software being ... GhostScriptLib. vb (contains methods to convert PDF to TIFF for ... One of the XmlTextReader constructors looks like this: public XmlTextReader(TextReader); TextReader is an abstract class that represents a NET reader object capable of reading a sequence of characters no matter where they are physically stored The StringReader class inherits from TextReader and simply makes itself capable of reading the bytes of an in-memory string Because StringReader derives from TextReader, you can safely use it to initialize XmlTextReader string xmlText = " "; StringReader strReader = new StringReader(xmlText); XmlTextReader reader = new XmlTextReader(strReader); The net effect of this code snippet is that the XML code stored in the xmlText variable is parsed as it is read from a disk file or an open stream or downloaded from a URL Important Any class based on TextReader is inherently not thread-safe. vb.net code to extract text from pdf: Reading PDF content with itextsharp dll in VB . NET or C# - Stack ... vb.net pdf viewer control FREE PDF Viewer for WebForms by Frank Kusluski - Planet Source Code
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Now I have tree ideas to make a pdf reader :* The first is with use component of Adobe Reader,but the probleme is we need always An Adobe ... Additionally, getting the return address and parameters would be a snap because they are at ESP+04h and ESP+08h, respectively Keep in mind that I'm not doing anything out of the ordinary with the prolog and epilog code, so I still perform the usual PUSH EBP and MOV EBP, ESP for the prolog and MOV ESP, EBP and POP EBP for the epilog Because each hook function was going to be declared as __declspec(naked), I wrote a couple of macros to handle the prolog and epilog: HOOKFN_PROLOG and HOOKFN_EPILOG I also went ahead and declared some common local variables that all hook functions would need in HOOKFN_PROLOG These variables included the last error value, dwLastError, and the event information structure to pass to the DeadDetExt DLL, stEvtInfo The dwLastError is yet another bit of state that I needed to preserve when intercepting functions. Summary asp.net open pdf file in web browser using c# vb.net Open a PDF file in a WebBrowser control in Visual Basic . NET
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Here is the first one given: javascript - Open PDF in new browser full window ... The user doesn't have access to the server's local file system. The Windows API can return a special error code through SetLastError to provide more information if a function fails This error code can be a real boon because it tells you why an API function failed For example, if GetLastError returns 122, you know that the buffer parameter was too small WINERRORH contains all the error codes the operating system returns The problem with hook functions is that they can reset the last error as part of their processing This behavior can wreak havoc if your application relies on the last error If you call CreateEvent and want to see whether the returned handle was created or just opened, CreateEvent sets the last error to ERROR_ALREADY_EXISTS if it just opened the handle. Among other things, this means that the string object you are using to contain parsable XML data might be concurrently accessed from other threads Of course, this happens only under special conditions, but it is definitely a plausible scenario If you have a multi-threaded application and the string itself happens to be globally visible throughout the application, one thread could break the well-formedness of the string while another thread is parsing it To avoid this situation, create a thread-safe wrapper for the StringReader class using the TextReader class's static member Synchronized, as shown here: String xmlText = " "; StringReader sr = new StringReader(xmlText); XmlTextReader reader = new XmlTextReader(sr); TextReader strReader = TextReaderSynchronized(sr); For performance reasons, you should use the thread-safe wrapper class only when strictly necessary Even better, wherever possible, you should design your code to avoid the need for thread-safe classes.. Because the cardinal rule of intercepting functions is that you can't change the expected behavior of the function, I needed to call GetLastError immediately after the real function call so that my hook function could properly set the last error code that the real function returned The general rule for a hook function is that you need to call GetLastError right after you call the real function and then call SetLastError as the last action before leaving the hook function Common Debugging Question: If ReturnAddress is now available, why didn't you use it instead of going to all this trouble. Code complexity is an essential metric for identifying where bugs might exist in your application and is equally valuable in identifying code that can cause maintenance issues. If you are not measuring complexity in any part of your code, start by measuring it in your most critical functionality or features. Over time, you can expand the scope of your complexity measurements and begin to compare complexity between components or feature areas. Complexity is also an easy metric to misuse, so it is critical that you use the metrics wisely and monitor the value to ensure that these metrics are discovering what you expect them to discover. Remember that When it came time to update DeadlockDetection for the second edition of this book, I thought I might want to go through and update the HOOKFN_PROLOG macro to use the new _ReturnAddress intrinsic to make my life a little easier. That would mean I could get rid of the naked declarations and make the functions more normal, and not rely on the special prolog and epilog. However, the one great advantage I get with the existing macros is that I can treat the parameters as a blob in memory and pass them directly to the output function. If I were to use standard functions, I'd have to require some sort of weird address of casting to achieve the same thing. I also had the most powerful argument of all: the code was working quite well and I wasn't going to buy sufficient advantage to consider rewriting the code. Consequently, I left the naked functions as they were. Fragments and Parser Context The context for an XML parser consists of all the information that can be used to customize the way in which the parser works. Context information includes the encoding character set, the DTD information needed to set all the default attributes and to expand entities, the namespaces, the language, and the white space handling. If you specify the XML fragment using a StringReader object, as shown in the previous section, all elements of the parser context are set with default values. The parser context is fully defined by the XmlParserContext class. When instantiating an XmlTextReader class to operate on a string, you use the following constructor and specify a parser context: public XmlTextReader( string xmlFragment, XmlNodeType fragType, XmlParserContext context ); The xmlFragment parameter contains the XML string to parse. The fragType argument, on the other hand, represents the type of fragment. It specifies the type of the node at the root of the fragment. Only Element, Attribute, and Document nodes are permitted. The XmlParserContext constructor has a few overloads. The one with the shortest list of arguments, shown here, is probably the overload you will use most often: public XmlParserContext( XmlNameTable nt, XmlNamespaceManager nsMgr, string xmlLang, XmlSpace xmlSpace ); Creating a new parser context is as easy as running the following statements: NameTable table = new NameTable(); table.Add("Author"); XmlNamespaceManager mgr = new XmlNamespaceManager(table); mgr.AddNamespace("company", "urn:ThisIsMyBook"); XmlParserContext context; context = new XmlSpace.None); XmlParserContext(table, mgr, "en-US", At this point, I thought I was done except for testing Unfortunately, my first test uncovered a bug: I wasn't preserving ESI and EDI across the hook call because the documentation on using the inline assembler explicitly stated that you didn't have to save them After I fixed the ESI/EDI register problem, DeadlockDetection seemed to work fine When I started doing register comparisons on before, during, and after cases, however, I noticed that I wasn't returning the values the real functions left in EBX, ECX, and EDX, and worse yet, in the flags' registers Although I didn't see any problems and the documentation said that those registers didn't need to be preserved, I still was concerned that my hook functions were changing the application state. high complexity tells you only that the code might be prone to having more bugs. You might need additional investigation to know for sure. I declared the REGSTATE structure to hold the register values after the real function call so that I could restore the values when my hook function returned To save and restore the registers, I created two additional macros, REAL_FUNC_PRE_CALL and REAL_FUNC_POST_CALL, which I placed around the real call the hook function makes After a little more testing, I found another problem: in release builds with full optimizations, I crashed inexplicably every so often I finally tracked down those crashes and was able to attribute them to the effect of the optimizer on some of my hook functions The optimizer was trying to be helpful but ended up doing more harm than good I was very careful about the register usage in my hook functions and used only EAX or stack memory directly. vb.net display pdf in picturebox PDF Viewer Control Without Acrobat Reader Installed - CodeProject
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