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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: How does ECC (error correction codes) for burst error correction work (disk drive style)? It is either a curse or blessing, but often my brain tries to solve technical problems in my dreams. Sometimes it does. Like last night, my brain demanded to understand how to design an ECC algorithm (software program but possibly FPGA circuitry eventually) to implement the kind of ECC appropriate for disk drives. The kind of ECC appropriate for these devices appears to be "burst error detection". As I understand this, the reason disk drives have errors

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: We use an assembly with some user defined functions in our installation of SQL Server 2005 (32 bit). We deploy this to production with a script like this: CREATE ASSEMBLY [Ourfunctions] AUTHORIZATION [dbo] FROM 0x4D5A9000...000 WITH PERMISSION_SET = SAFE GO CREATE FUNCTION [dbo].[GLOBAL_FormatString](@input [nvarchar](4000)) RETURNS [nvarchar](4000) WITH EXECUTE AS CALLER AS EXTERNAL NAME [Ourfunctions].[UserDefinedFunctions].[GLOBAL_FormatString] GO We have never experienced any problems with these functions. Now, when we tried to upgrade

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Im trying to run sample app from wxFreeChart library. After compilation on linking there is an error: wxcode_msw28d_freechart.lib(wxfreechart_lib_xydataset.obj) : fatal error LNK1112: module machine type 'x64' conflicts with target machine type 'X86' I tried to switch linker option\advanced\target machine to MachineX64 but it doesnt work. Im using visual studio 2008, any suggestion ? thanks for help 回答1: The error is explicit, you are trying to link libraries that were compiled with different CPU targets. An executable image can only contain

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a server that is capable of creating and running an Excel Import task using the Import Wizard. I am trying to automate that process by using a visual Studio 2010 Integration Services package, that I am developing on that server. The problem happens when trying to design the package. I have added an excel connection and pointed it at the Excel file on a local disk (the same file I have already successfully imported using the import wizard). When I add an Excel Source to the DataFlow and specify the excel connection, when I go to the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In my code i need to calculate CRC-16 16 bit values for the HEX values stored as NSdata, below is the code snippet to calculate CRC-16 in c. void UpdateCRC(unsigned short int *CRC, unsigned char x) { // This function uses the initial CRC value passed in the first // argument, then modifies it using the single character passed // as the second argument, according to a CRC-16 polynomial // Arguments: // CRC -- pointer to starting CRC value // x -- new character to be processed // Returns: // The function does not return any values, but updates

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Possible Duplicate: C reverse bits in unsigned integer How can I reverse a binary number only using binary operators? E.g: 11100000 -> 00000111 00110100 -> 00101100 00111111 -> 11111100 回答1: For this sort of thing I recommend that you take a look at the awesome page Bit Twiddling Hacks . Here is just one example solution taken from that page: Reverse the bits in a byte with 3 operations (64-bit multiply and modulus division) unsigned char b; // reverse this (8-bit) byte b = (b * 0x0202020202ULL & 0x010884422010ULL) % 1023; And as pointed out

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have read through this SO question about 32-bits, but what about 64-bit numbers? Should I just mask the upper and lower 4 bytes, perform the count on the 32-bits and then add them together? 回答1: You can find 64 bit version here http://en.wikipedia.org/wiki/Hamming_weight It is something like this static long NumberOfSetBits(long i) { i = i - ((i >> 1) & 0x5555555555555555); i = (i & 0x3333333333333333) + ((i >> 2) & 0x3333333333333333); return (((i + (i >> 4)) & 0xF0F0F0F0F0F0F0F) * 0x101010101010101) >> 56; } This is a 64 bit version of

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to sniff the http headers by using tcpdump. This filter works well but I can't understand it - (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0) I've googled it but I can't find any useful info Here is the whole tcpdump command sudo tcpdump -A 'dst [dest host] or src [src host] and tcp and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' -i eth0 回答1: It's not the BPF filter that gets http headers but the "-A" switch on your tcpdump command. Your tcpdump command looks for tcp traffic to certain destination or

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: >>> from matplotlib import pyplot as plt Traceback ( most recent call last ): File " " , line 1 , in from matplotlib import pyplot as plt File "C:\Python27\lib\site-packages\matplotlib\pyplot.py" , line 24 , in import matplotlib . colorbar File "C:\Python27\lib\site-packages\matplotlib\colorbar.py" , line 27 , in import matplotlib . artist as martist File "C:\Python27\lib\site-packages\matplotlib\artist.py" , line 8 , in from transforms import Bbox , IdentityTransform , TransformedBbox , \ File "C:\Python27\lib\site-packages

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Any CPU ) is running as a 32-bit or 64-bit application? 回答1: if (IntPtr.Size == 8) { // 64 bit machine } else if (IntPtr.Size == 4) { // 32 bit machine } 回答2: If you're using .NET 4.0, it's a one-liner for the current process: Environment.Is64BitProcess Reference: Environment.Is64BitProcess Property (MSDN) 回答3: I found this code from Martijn Boven that does the trick: public static bool Is64BitMode() { return System.Runtime.InteropServices.Marshal.SizeOf(typeof(IntPtr)) == 8; } 回答4: This code sample from Microsoft All-In-One Code Framework