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class CreateFileHelper { [DllImport("kernel32.DLL", SetLastError=true)] private static extern SafeFileHandle CreateFile( string fileName, uint desiredAccess, uint shareMode, IntPtr securityAttributes, uint creationDisposition, uint flags, IntPtr templateHandle); /// <summary> /// Open a file for reading using the Win32 /// CreateFile function /// </summary> /// <param name="fileName"></param> /// <returns></returns> public static SafeFileHandle OpenFileForReading( string fileName) { const uint FILE_SHARE_READ = 0x00000001; const uint OPEN_EXISTING = 3; //call the Win32 API SafeFileHandle fileHandle = CreateFile( fileName, 0, FILE_SHARE_READ, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero); if (fileHandle.IsInvalid) { int lastErrorCode = Marshal.GetLastWin32Error(); throw new Win32Exception(lastErrorCode); } else { return fileHandle; } } } This class declares the CreateFile function that we will need to obtain a file handle. CreateFile returns a handle to a file, which we marshal as a SafeFileHandle. Notice that we make use of the IsInvalid property of the SafeFileHandle. This takes the place of code that we would normally have to write to check for a 1 value in the file handle. Since this wrapper is designed only as a way to open an existing file rather than a generalpurpose CreateFile wrapper, we omit most of the constant definitions and only implement the values that we need. The GetFileSize function is declared in C# like this: c# pdf split merge How to Convert PDF to Image (JPG or PNG) In C# - Accusoft
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Hiii, I want to open a pdf file from fileuploader's selected path and then priview it in same page (inside the div) . The PDF's contains the unique ... [DllImport("kernel32DLL", SetLastError=true)] private static extern int GetFileSize( SafeFileHandle fileHandle, IntPtr fileSizeHigh); The code to test these functions looks like this: //create a test file in managed code so we //can open and use it in unmanaged code using (StreamWriter writer = new StreamWriter("testfiletxt")) { writerWriteLine("this is a test line"); } // //open a file using the unmanaged CreateFile function //and then use the handle to call GetFileSize //when the using block loses scope, the SafeFileHandle //is closed This will free the handle to the //unmanaged resource (file) // using (SafeFileHandle fileHandle = CreateFileHelperOpenFileForReading("testfiletxt")) { //use the file handle to call the GetFileSize function ConsoleWriteLine("GetFileSize: {0}", GetFileSize(fileHandle, IntPtrZero)); } We start our test by creating a test file that will be used to retrieve the file size The OpenFileForReading method of our CreateFile class is executed and returns a SafeFileHandle to the file. Figure 4-11. Notification e-mail from FogBugz The e-mail contains the essential information to help you remember the case but it doesn t show the actual change that caused the e-mail to be sent. If you need that level of detail, you need to click the hyperlink to open the case in your browser. c# split pdf itextsharp Windows How to Convert PDF to Image in C#.NET sample in C# for ...
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Aug 14, 2018 · code taken from https://www.c-sharpcorner.com/article/splitting-pdf-file-in-c-sharp-using-itextsharp/ i got a routine which add page number. common method of connecting inputs that it's provided inside the ATMega itself, but it's shown on the schematic to demonstrate what happens behind the scenes. Next, we pass this handle to the GetFileSize Win32 function that returns the size of the file When the using block goes out of scope, the Dispose method is called on the SafeFileHandle This indicates that we are done with this handle If the internal reference count within the SafeFileHandle is zero, it will be closed using the CloseHandle Win32 function In this example, we could have also called the Close method ourselves The internal reference count is automatically incremented when the SafeFileHandle is passed to a function via a PInvoke call When the call returns it is decremented If another thread is in the middle of a PInvoke call with this same handle, that would delay the closing of the handle It is also possible to manually increment and decrement the count using the DangerousAddRef and DangerousRelease methods of SafeFileHandle. Figure 10-3 Open-collector sensor connected to an Arduino This may all sound confusing at first because the logic is doing the opposite of what you might expect, but it all works out nicely in the end! Use of a pull-up resistor that is overridden by a device using 0V to indicate an event is an important concept to understand because many devices use open-collector outputs, and interfacing with them is a common requirement in Arduino projects In fact, it's such a common arrangement that all ATMega digital inputs have internal pull-up resistors fitted to them, but the CPU designers didn't even bother including corresponding pull-down resistors At this point you could also fit the status LED, with the anode (long) lead connected to +5V The cathode (short) lead connects to a 680R resistor, which in turn connects to Arduino digital I/O line 13. These methods are named this way for a reason and should be used with great care Ultimately, the actual handle is closed when the last thread that is using the SafeFileHandle calls Dispose or Close on its reference at a time when the internal reference count is zero When the code is executed, the results look like this: GetFileSize: 21. The file size of 21 is correct since we wrote a 19-byte ANSI string plus a carriage return and line feed. c# split pdf Splitting a PDF from .NET (C# Code Provided) - DynamicPDF
May 22, 2012 · We get a decent amount of people who ask us about dynamically splitting a PDF. Splitting a PDF document using DynamicPDF Merger for . c# pdf split merge Extract Page(s) From PDF File in C#.Net using iTextSharp | IT Stack
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