memorystream

问题 Should I allocate the memory or just the object of the memory stream: Is this OK? MemoryStream memoryStream = new MemoryStream(); bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg); If I need to define the MemoryStream size, how can I get it from Bitmap? 回答1: .NET is a managed environment: specifically, memory allocation is usually managed on your behalf by the .NET runtime. You don't typically need to allocate the memory yourself. Sometimes, however, you do need to inform the

问题 What's the easiest way to search for a string within a memory stream (and multiple strings) and return true or false? 回答1: var ms:TMemoryStream; strS:TStringStream; aStr:string; aPos:integer; found:boolean; begin ms:=TMemoryStream.Create; ms.LoadFromFile('c:\aFile.txt'); strS:=TStringStream.Create; strS.LoadFromStream(ms); aPos:=pos(aStr,strS.dataString); found:=aPos>0; end; TStringStream is an often forgetten but very useful tool - easier and safer than messing with pChars, etc. For multiple

问题 I have an existing pdf .I am using itextSharp to open the document and highlight keywords dynamically and when I save this into a file it works fine, but when I write it into a memory Stream and try to render it on the browser the highlights are not there. Here is the code public void SearchPDF() { //Create a new file from our test file with highlighting string highLightFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Highlighted.pdf"); // Stream //Bind a

问题 I have two codes: string fileInput = @"c:\temp\input.pdf"; string fileOutput = @"c:\temp\saida.pdf"; PdfReader reader = new PdfReader(fileInput); Stream output = new System.IO.FileStream(fileOutput, System.IO.FileMode.Create); Document doc = new Document(); PdfCopy writer = new PdfCopy(doc, output); doc.Open(); PdfImportedPage pagina = writer.GetImportedPage(reader, 23); writer.AddPage(pagina); doc.Close(); output.Close(); It works very well! The file has 46.451 bytes But I need use Memory

问题 I am working on mvc web based project, and want to convert base64 string to doc/docx file using c# ..I've idea about converting base64 to image file but don't have doc/docx file,have searched a lot but didn't get any solution. anyone have idea about this...? Thanks in advance.. 回答1: You can simply create rtf file Add system.windows.forms reference to your project RichTextBox rtb = new RichTextBox(); rtb.Text = "Base64String"; rtb.Save("Path"); And about creating docx file Use this open source

问题 I have a PDF created in memory using iTextSharp and contained in a MemoryStream. I now need to translate that MemoryStream PDF into something the printer understands. I've used Report Server in the past to render the pages to the printer format but I cant use it for this project. Is there a native .Net way of doing this? For example, GhostScript would be OK if it was a .Net assembly but I don't want to bundle any non .Net stuff along with my installer. The PrintDocument class in .Net is great

问题 For a .Net MemoryStream object instance, do I need to close it explicitly after using it? Or no need to close it? Which is the best practices? I am using VSTS2008 + .Net 3.5 + C#. 回答1: you should close it when you are done with it. The best practice is to close the stream in the finally section of a try-catch-finally block. you can get more information here: http://msdn.microsoft.com/en-us/library/system.io.memorystream.aspx 回答2: Better yet would be to use Using using (MemoryStream ms = /*get

问题 A few weeks ago I read something about a new class in .Net 4/4.5 that performs better than MemoryStream, but I can't seem to find it anymore. I've looked in the IO namespace and could not find anything. Does anyone remember reading something like that? Thanks 回答1: Perhaps you read about Memory Tributary, a CodePlex project that provides a MemoryStream replacement better suited for large amounts of memory MemoryTributary is a MemoryStream replacement using multiple memory segments to store the

问题 I am working on solution which uses asynchronous memory streaming and I am thinking about right approach for implementing such. Which one is more convenient? The first, simple: //First approach: linear async private async static Task WriteToStreamFirstVariant() { MemoryStream memoryStream = new MemoryStream(); byte[] data = new byte[256]; try { await memoryStream.WriteAsync(data, 0, data.Length); } catch(Exception exception) { //Handling exception } finally { memoryStream.Dispose(); } } Or

问题 I need to temporary store a file upload to a MemoryStream. What would be the best method to do this using asp.net (3.5)? Here's what I have so far. It works (locally tested), but it does not look right to me. protected void lnkUploadFile_Click(object sender, EventArgs e) { MemoryStream memStream = new MemoryStream(); BinaryWriter sWriter = new BinaryWriter(memStream); foreach (byte b in flUpload.FileBytes) { sWriter.Write(b); } sWriter.Flush(); // writing to file to verify file stream