statement and bitwise operations same in this example?

I was reading this answer and it is mentioned that this code; if (data[c] >= 128) sum += data[c]; can be replaced with this one; int t = (data[c] - 128) >> 31; sum += ~t & data[c]; I am having hard time grasping this. Can someone explain how bitwise operators achieve what if statement does? if (data[c] >= 128) sum += data[c]; Clearly adds data[c] to sum if and only

语句和按位操作在这个例子中是相同的?

我正在阅读这个答案,并提到这个代码; if (data[c] >= 128) sum += data[c]; 可以用这个替换; int t = (data[c] - 128) >> 31; sum += ~t & data[c]; 我很难理解这一点。 有人可以解释一下,如果声明的做法,按位运算符如何实现? if (data[c] >= 128) sum += data[c]; 当且仅当data[c]大于或等于128时,显然将data[c] sum很容易证明 int t = (data[c] - 128) >> 31; sum += ~t & data

Optimizing linear access to arrays with pre

disclosure: I've tried similar question on programmers.stack, but that place is nowhere near activity stack is. Intro I tend to work with lots of large images. They also come in sequences of more than one and have to be processed and played back repeatedly. Sometimes I use GPU, sometimes CPU, sometimes both. Most of access patterns are linear in nature (back and forth) which got me thi

使用pre优化对数组的线性访问

披露:我已经尝试过关于programmers.stack的类似问题,但那个地方远没有活动堆栈。 介绍 我倾向于使用大量大图片。 他们也有不止一个序列,必须重复处理和回放。 有时我会使用GPU,有时候会使用CPU,有时使用两者。 大多数访问模式本质上是线性的(来回),这让我想到了有关数组的更基本的东西,以及如何在给定硬件上编写优化最大内存带宽代码的方法(允许计算不会阻止读/写) 。 测试规格 我已经在2011年的MacbookAi

access a directory in a domain by username and password

I have developed an application in c# using visual studio 2015, that copies some files from one directory (source) to another (destination) in general. My problem is that the source path is another computer in a domain. I wish to be able to access the directory and get my files, user the domain, username and password the source computer. I have seen some solution, but I can't get how they

通过用户名和密码访问域中的目录

我已经在c#中使用visual studio 2015开发了一个应用程序,它将一些文件从一个目录(源)复制到另一个(目标)。 我的问题是源路径是域中的另一台计算机。 我希望能够访问该目录并获取我的文件,使用源计算机的域名,用户名和密码。 我已经看到了一些解决方案,但我无法得到他们如何访问其他计算机。 我曾经通过使用目录获取我的文件。 GetDirectories(路径),我现在使用它太深,不能改变它平滑。 感谢您帮助解决我的问

C# Copy file to folder with permissions

I'm writing a program that, among other things, needs to copy a particular file to a network folder. Since I'm on a company network, the credentials needed to access that folder are the same as my Windows credentials. The program works if I open the folder in Explorer, provide my username and password, and then run the uploader. It doesn't work without first providing that usernam

C#将文件复制到具有权限的文件夹

我正在编写一个程序,除其他外,需要将特定文件复制到网络文件夹。 由于我在公司网络上,访问该文件夹所需的凭证与我的Windows凭证相同。 如果我在资源管理器中打开文件夹,提供我的用户名和密码,然后运行上传程序,该程序将起作用。 没有首先提供该用户名和密码,它不起作用。 我如何告诉System.IO将DefaultNetworkCredentials提供给Copy方法? 还是有另一种方法可以用来完成这件事? string pathToFile = "myfile.csv"

C# getting the path of %AppData%

C# 2008 SP1 I am using the code below: dt.ReadXml("%AppData%\DateLinks.xml"); However, I am getting an exception that points to the location of where my application is running from: Could not find a part of the path 'D:ProjectsSubVersionProjectsCatDialerbinDebug%AppData%DateLinks.xml'. I thought the %AppData% should find the relative path. When I go Start|Run|%AppData% windows ex

C#获取%AppData%的路径

C#2008 SP1 我使用下面的代码: dt.ReadXml("%AppData%\DateLinks.xml"); 但是,我收到一个异常,指向我的应用程序运行的位置: 无法找到'D: Projects SubVersionProjects CatDialer bin Debug %AppData% DateLinks.xml'路径的一部分。 我认为%AppData%应该找到相对路径。 当我去Start|Run|%AppData% Windows资源管理器把我带到那个目录。 由于每台客户端计算机上的用户不同,我无法放入完整路径。

Validate a username and password against Active Directory?

How can I validate a username and password against Active Directory? I simply want to check if a username and password are correct. If you work on .NET 3.5 or newer, you can use the System.DirectoryServices.AccountManagement namespace and easily verify your credentials: // create a "principal context" - e.g. your domain (could be machine, too) using(PrincipalContext pc = new PrincipalContext(

根据Active Directory验证用户名和密码?

我如何根据Active Directory验证用户名和密码? 我只是想检查用户名和密码是否正确。 如果您使用.NET 3.5或更高版本,则可以使用System.DirectoryServices.AccountManagement命名空间并轻松验证您的凭据: // create a "principal context" - e.g. your domain (could be machine, too) using(PrincipalContext pc = new PrincipalContext(ContextType.Domain, "YOURDOMAIN")) { // validate the credentials bool is

How to copy the entire contents of directory in C#?

I want to copy the entire contents of a directory from one location to another in C#. There doesn't appear to be a way to do this using System.IO classes without lots of recursion. There is a method in VB that we can use if we add a reference to Microsoft.VisualBasic : new Computer().FileSystem.CopyDirectory(sourceFolder, outputFolder); This seems like a rather ugly hack. Is there a be

如何在C#中复制整个目录的内容?

我想在C#中将目录的全部内容从一个位置复制到另一个位置。 似乎没有办法做到这一点使用System.IO类没有很多递归。 如果我们添加对Microsoft.VisualBasic的引用,我们可以使用VB中的一种方法: new Computer().FileSystem.CopyDirectory(sourceFolder, outputFolder); 这似乎是一个相当丑陋的黑客。 有没有更好的办法? 更容易//Now Create all of the directories foreach (string dirPath in Directory.GetDirectories(

c# network login

How do I perform a network login, to access a shared driver for instance, programmatically in c#? The same can be achieved by either attempting to open a share through the explorer, or by the net use shell command. P/Invoke call to WNetAddConnection2 will do the trick. Look here for more info. [DllImport("mpr.dll")] public static extern int WNetAddConnection2A ( [MarshalAs(UnmanagedT

c#网络登录

我如何执行网络登录,以访问共享驱动程序为例,以编程方式在C#中? 通过试图通过资源管理器打开共享或通过net use shell命令可以实现同样的目的。 对WNetAddConnection2的P / Invoke调用可以做到这一点。 在这里寻找更多的信息。 [DllImport("mpr.dll")] public static extern int WNetAddConnection2A ( [MarshalAs(UnmanagedType.LPArray)] NETRESOURCEA[] lpNetResource, [MarshalAs(UnmanagedType.LPStr)

Copying Excel worksheets with NPOI CopySheet; copy is always blank

I'm trying to create an application that will merge the excel spreadsheets in a given directory into a single, tabbed Excel workbook. I only have access to VS Community 2015, so VSTO is out of the question; I'm using Interop and NPOI 2.1.3.1 instead. Here's my code: files = Directory.GetFiles(sourcePath); XSSFWorkbook test = new XSSFWorkbook(); try { string fPath = files[0];

复制Excel工作表与NPOI CopySheet; 副本总是空白

我正在尝试创建一个应用程序,该程序可将给定目录中的Excel电子表格合并到单个标签化的Excel工作簿中。 我只能访问VS社区2015,所以VSTO是不可能的。 我正在使用Interop和NPOI 2.1.3.1。 这是我的代码: files = Directory.GetFiles(sourcePath); XSSFWorkbook test = new XSSFWorkbook(); try { string fPath = files[0]; FileStream fs2 = new FileStream(fPath, FileMode.Open, FileAccess.ReadWrite); XSSF

How do I format my export to excel workbook in microsoft.office.interop.excel?

I have this export function that allows me to export 2 grid views into 2 separated worksheets in one excel. But my problems are: How can I have a usual popup window like usual download when I click on export button to prompt user to OPEN, SAVE AS, CANCEL of the download instead of saving it to a specific location (currently what I am doing in my codes)? How can I set a code to enable wrapte

如何将我的导出格式化为microsoft.office.interop.excel中的excel工作簿?

我有这个导出功能,允许我在一个excel中将2个网格视图导出为2个独立的工作表。 但我的问题是: 当我点击导出按钮以提示用户打开,另存为,取消下载而不是将其保存到特定位置(目前我在我的代码中正在执行的操作)时,如何才能像平常下载一样使用常见的弹出窗口? 我如何设置代码以启用所有单元格的wraptext = true,并自动格式化列高和宽以固定所有文本,以便在列宽不变时不显示######作为示例excel打开时太小。 protect