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• How to simulate a file read error in the CRT

  - by Mark0978

  Using VS2008, we would like to simulate a file that has a size of X, but that has a read failure at X-Y bytes, so that we get an error indication. Anyone have an idea of how to do this on windows? Looks like there is a solution for linux, but I can't really come up with a way to do this on windows. We have multiple developers, multiple machines, and cppunit testing framework, so I want a software only design. I'm trying to simulate the actual CRT failing, so I can test the code that is dealing with the failure.

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• java: how to get a string representation of a compressed byte array ?

  - by Guillaume

  I want to put some compressed data into a remote repository. To put data on this repository I can only use a method that take the name of the resource and its content as a String. (like data.txt + "hello world"). The repository is moking a filesystem but is not, so I can not use File directly. I want to be able to do the following: client send to server a file 'data.txt' server compress 'data.txt' into a compressed file 'data.zip' server send a string representation of data.zip to the repository repository store data.zip client download from repository data.zip and his able to open it with its favorite zip tool The problem arise at step 3 when I try to get a string representation of my compressed file. Here is a sample class, using the zip*stream and that emulate the repository showcasing my problem. The created zip file is working, but after its 'serialization' it's get corrupted. (the sample class use jakarta commons.io ) Many thanks for your help. package zip; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; import java.util.zip.ZipOutputStream; import org.apache.commons.io.FileUtils; /** * Date: May 19, 2010 - 6:13:07 PM * * @author Guillaume AME. */ public class ZipMe { public static void addOrUpdate(File zipFile, File ... files) throws IOException { File tempFile = File.createTempFile(zipFile.getName(), null); // delete it, otherwise you cannot rename your existing zip to it. tempFile.delete(); boolean renameOk = zipFile.renameTo(tempFile); if (!renameOk) { throw new RuntimeException("could not rename the file " + zipFile.getAbsolutePath() + " to " + tempFile.getAbsolutePath()); } byte[] buf = new byte[1024]; ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile)); ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile)); ZipEntry entry = zin.getNextEntry(); while (entry != null) { String name = entry.getName(); boolean notInFiles = true; for (File f : files) { if (f.getName().equals(name)) { notInFiles = false; break; } } if (notInFiles) { // Add ZIP entry to output stream. out.putNextEntry(new ZipEntry(name)); // Transfer bytes from the ZIP file to the output file int len; while ((len = zin.read(buf)) > 0) { out.write(buf, 0, len); } } entry = zin.getNextEntry(); } // Close the streams zin.close(); // Compress the files if (files != null) { for (File file : files) { InputStream in = new FileInputStream(file); // Add ZIP entry to output stream. out.putNextEntry(new ZipEntry(file.getName())); // Transfer bytes from the file to the ZIP file int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } // Complete the entry out.closeEntry(); in.close(); } // Complete the ZIP file } tempFile.delete(); out.close(); } public static void main(String[] args) throws IOException { final String zipArchivePath = "c:/temp/archive.zip"; final String tempFilePath = "c:/temp/data.txt"; final String resultZipFile = "c:/temp/resultingArchive.zip"; File zipArchive = new File(zipArchivePath); FileUtils.touch(zipArchive); File tempFile = new File(tempFilePath); FileUtils.writeStringToFile(tempFile, "hello world"); addOrUpdate(zipArchive, tempFile); //archive.zip exists and contains a compressed data.txt that can be read using winrar //now simulate writing of the zip into a in memory cache String archiveText = FileUtils.readFileToString(zipArchive); FileUtils.writeStringToFile(new File(resultZipFile), archiveText); //resultingArchive.zip exists, contains a compressed data.txt, but it can not //be read using winrar: CRC failed in data.txt. The file is corrupt } }

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• C# int to byte[]

  - by Petoj

  If I need to convert an int to byte[] I could use Bitconvert.GetBytes(). But if I should follow this: An XDR signed integer is a 32-bit datum that encodes an integer in the range [-2147483648,2147483647]. The integer is represented in two's complement notation. The most and least significant bytes are 0 and 3, respectively. Integers are declared as follows: Taken from RFC1014 3.2. What method should I use then if there is no method to do this? How would it look like if you write your own? I don't understand the text 100% so I can't implement it on my own.

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• FileInputStream negative skip

  - by Peter Štibraný

  I'm trying to find more about history of FileInputStream.skip(negative) operation. According to InputStream documentation: If n is negative, no bytes are skipped. It seems that implementation of FileInputStream from Sun used to throw IOException instead, which is now also documented in Javadoc: If n is negative, an IOException is thrown, even though the skip method of the InputStream superclass does nothing in this case. I just tried that, and found that FileInputStream.skip(-10) did in fact return -10! It didn't threw exception, it didn't even return 0, it returned -10. (I've tried with Java 1.5.0_22 from Sun, and Java 1.6.0_18 from Sun). Is this a known bug? Why hasn't it been fixed, or why documentation is kept the way it is? Can someone point me to some discussion about this issue? I can't find anything.

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• IIS7 + ASP.NET MVC Client Caching Headers Not Working

  - by Tobin Harris

  Hey folks I've deployed an ASP.NET MVC app on IIS7 and Windows Server 2008. I've read posts on here, and around the web, but can't get the darn client-side caching to work. I'm trying to cache everything in the /Content folder. So far I've select that folder in IIS manager, and set the appropriate HTTP Response Headers (under Common Headers). I've also checked the web.config file in the /Content folder and the values there are being set. All resources in /Content come back with this (from FireBug): Cache-Control no-cache, no-store, must-revalidate Pragma no-cache Content-Type image/png Expires -1 Last-Modified Sun, 11 Oct 2009 19:01:40 GMT Accept-Ranges bytes Etag "f318d643a54aca1:0" Server Microsoft-IIS/7.0 X-Powered-By ASP.NET Date Sun, 11 Oct 2009 20:40:01 GMT Content-Length 620 Note the Cache-Control and Expires values for this static image being requested. The site is currently compiled in Debug (this will change), but surely that wouldn't make a difference? Obviously I'm overlooking something, any ideas would be appreciated. Thanks

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• binary file to string

  - by andrew

  i'm trying to read a binary file (for example an executable) into a string, then write it back FileStream fs = new FileStream("C:\\tvin.exe", FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bin = br.ReadBytes(Convert.ToInt32(fs.Length)); System.Text.Encoding enc = System.Text.Encoding.ASCII; string myString = enc.GetString(bin); fs.Close(); br.Close(); System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); byte[] rebin = encoding.GetBytes(myString); FileStream fs2 = new FileStream("C:\\tvout.exe", FileMode.Create); BinaryWriter bw = new BinaryWriter(fs2); bw.Write(rebin); fs2.Close(); bw.Close(); this does not work (the result has exactly the same size in bytes but can't run) if i do bw.Write(bin) the result is ok, but i must save it to a string

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• binary file formats: need for error correction?

  - by Jason S

  I need to serialize some data in a binary format for efficiency (datalog where 10-100MB files are typical), and I'm working out the formatting details. I'm wondering if realistically I need to worry about file corruption / error correction / etc. What are circumstances where file corruption can happen? Should I be building robustness to corruption into my binary format? Or should I wrap my nonrobust-to-corruption stream of bytes with some kind of error correcting code? (any suggestions? I'm using Java) Or should I just not worry about this?

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• Perl TDS character sets

  - by skiphoppy

  I'm using the FreeTDS driver with DBD::Sybase, connecting to an MS SQL Server. When I query certain values of certain records, I get this error: DBD::Sybase::st fetchrow_arrayref failed: OpenClient message: LAYER = (0) ORIGIN = (0) SEVERITY = (9) NUMBER = (99) Server , database Message String: WARNING! Some character(s) could not be converted into client's character set. Unconverted bytes were changed to question marks ('?'). This seems to happen for records that contain special Windows character-set characters, such as curly quotes, copied and pasted from people's Outlook and Word messages. Unfortunately, I do not have any control of this database; sanitizing the input on the way in is obviously the way to go, but is not available to me. What FreeTDS settings do I need to change to be able to successfully query these records?

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• to print local xml file through NSData?

  - by senthilmuthu

  hi, i want to take some xml data from local path,and to parse,but when i use following code NSLog returns(content) different texts which is differed from xml file, how can i get exact xml data to check ,it consists correct xml data or not? any help please? when i parse , it returns nothing..i have saved the file as .xml and copied to local resource folder? NSString *xmlFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"samp.xml"]; NSString *xmlFileContents = [NSString stringWithContentsOfFile:xmlFilePath]; NSData *data = [NSData dataWithBytes:[xmlFileContents UTF8String] length:[xmlFileContents lengthOfBytesUsingEncoding: NSUTF8StringEncoding]]; NSString *content=[[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding]; NSLog(@"%@",content);

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• exchanging 2 memory positions

  - by Jordi

  I am working with OpenCV and Qt, Opencv use BGR while Qt uses RGB , so I have to swap those 2 bytes for very big images. There is a better way of doing the following? I can not think of anything faster but looks so simple and lame... int width = iplImage->width; int height = iplImage->height; uchar *iplImagePtr = (uchar *) iplImage->imageData; uchar buf; int limit = height * width; for (int y = 0; y < limit; ++y) { buf = iplImagePtr[2]; iplImagePtr[2] = iplImagePtr[0]; iplImagePtr[0] = buf; iplImagePtr += 3; } QImage img((uchar *) iplImage->imageData, width, height, QImage::Format_RGB888);

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• Hex to Decimal conversion in C

  - by darkie15

  Hi All, Here is my code which is doing the conversion from hex to decimal. The hex values are stored in a unsigned char array: int liIndex ; long hexToDec ; unsigned char length[4]; for (liIndex = 0; liIndex < 4 ; liIndex++) { length[liIndex]= (unsigned char) *content; printf("\n Hex value is %.2x", length[liIndex]); content++; } hexToDec = strtol(length, NULL, 16); Each array element contains 1 byte of information and I have read 4 bytes. When I execute it, here is the output that I get : Hex value is 00 Hex value is 00 Hex value is 00 Hex value is 01 Chunk length is 0 Can any one please help me understand the error here. Th decimal value should have come out as 1 instead of 0. Regards, darkie

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• Why is a fixed size buffers (arrays) must be unsafe?

  - by brickner

  Let's say I want to have a value type of 7 bytes (or 3 or 777). I can define it like that: public struct Buffer71 { public byte b0; public byte b1; public byte b2; public byte b3; public byte b4; public byte b5; public byte b6; } A simpler way to define it is using a fixed buffer public struct Buffer72 { public unsafe fixed byte bs[7]; } Of course the second definition is simpler. The problem lies with the unsafe keyword that must be provided for fixed buffers. I understand that this is implemented using pointers and hence unsafe. My question is why does it have to be unsafe? Why can't C# provide arbitrary constant length arrays and keep them as a value type instead of making it a C# reference type array or unsafe buffers?

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• What Am I Missing? : iPhone Objective-C NSInputStream initWithData

  - by gabe

  I'm creating an NSInputStream from an NSData object but once created the stream reports NO for hasBytesAvailable: NSData* data = [outputStream propertyForKey: NSStreamDataWrittenToMemoryStreamKey]; NSLog(@"creating stream with data 0x%x length %d", [data bytes], [data length]); NSInputStream *insrm = [[NSInputStream alloc] initWithData:data]; [insrm open]; uint8_t* buf = NULL; NSUInteger len; BOOL result = [insrm getBuffer:&buf length:&len]; BOOL hasbytes = [insrm hasBytesAvailable]; NSLog(@"getBuffer:%d hasBytes:%d", result, hasbytes); NSLog(@"created inputstream data %d len %d", buf, len); Log: [26797:20b] creating stream with data 0x7050000 length 34672 [26797:20b] getBuffer:0 hasBytes:0 [26797:20b] created inputstream data 0 len 0 What am I missing here?

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• regex to match postgresql bytea

  - by filiprem

  In PostgreSQL, there is a BLOB datatype called bytea. It's just an array of bytes. bytea literals are output in the following way: '\\037\\213\\010\\010\\005`Us\\000\\0001.fp3\'\\223\\222%' See PostgreSQL docs for full definition of the format. I'm trying to construct a Perl regular expression which will match any such string. It should also match standard ANSI SQL string literals, like 'Joe', 'Joe''s Mom', 'Fish Called ''Wendy''' It should also match backslash-escaped variant: 'Joe\'s Mom', . First aproach (shown below) works only for some bytea representations. s{ ' # Opening apostrophe (?: # Start group [^\\\'] # Anything but a backslash or an apostrophe | # or \\ . # Backslash and anything | # or \'\' # Double apostrophe )* # End of group ' # Closing apostrophe }{LITERAL_REPLACED}xgo; For other (longer ones, with many escaped apostrophes, Perl gives such warning: Complex regular subexpression recursion limit (32766) exceeded at ./sqa.pl line 33, < line 1. So I am looking for a better (but still regex-based) solution, it probably requires some regex alchemy (avoiding backreferences and all).

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• Using LINQ to search a byte array for all subarrays that start/stop with certain byte

  - by Joel B

  I'm dealing with a COM port application and we have a defined variable-length packet structure that I'm talking to a micro-controller with. The packet has delimiters for the start and stop bytes. The trouble is that sometimes the read buffer can contain extraneous characters. It seems like I'll always get the whole packet, just some extra chatter before/after the actual data. So I have a buffer that I append data to whenever new data is received from the COM port. What is the best way to search this buffer for any possible occurrences of my packet? For example: Say my packet delimiter is 0xFF and I have an array as such { 0x00, 0xFF, 0x02, 0xDA, 0xFF, 0x55, 0xFF, 0x04 } How can I create a function/LINQ-statment that returns all subarrays that start and end with the delimiter (almost like a sliding-correlator with wildcards)? The sample would return the following 3 arrays: {0xFF, 0x02, 0xDA, 0xFF}, {0xFF, 0x55, 0xFF}, and {0xFF, 0x02, 0xDA, 0xFF, 0x55, 0xFF}

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• How to find the mime type of a file in python?

  - by Daren Thomas

  Let's say you want to save a bunch of files somewhere, for instance in BLOBs. Let's say you want to dish these files out via a web page and have the client automatically open the correct application/viewer. Assumption: The browser figures out which application/viewer to use by the mime-type (content-type?) header in the HTTP response. Based on that assumption, in addition to the bytes of the file, you also want to save the MIME type. How would you find the MIME type of a file? I'm currently on a Mac, but this should also work on Windows. Does the browser add this information when posting the file to the web page? Is there a neat python library for finding this information? A WebService or (even better) a downloadable database? Edit: Thank you, Dave Webb.

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• my version of strlcpy

  - by robUK

  Hello, gcc 4.4.4 c89 My program does a lot of string coping. I don't want to use the strncpy as it doesn't nul terminate. And I can't use strlcpy as its not portable. Just a few questions. How can I put my function those its paces to ensure that it is completely safe and stable. Unit testing? Is this good enough for production? size_t s_strlcpy(char *dest, const char *src, const size_t len) { size_t i = 0; /* Always copy 1 less then the destination to make room for the nul */ for(i = 0; i < len - 1; i++) { /* only copy up to the first nul is reached */ if(*src != '\0') { *dest++ = *src++; } else { break; } } /* nul terminate the string */ *dest = '\0'; /* Return the number of bytes copied */ return i; } Many thanks for any suggestions,

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• question about fgets

  - by user105033

  Is this safe to do? (does fgets terminate the buffer with null) or should I be setting the 20th byte to null after the call to fgets before i call clean. // strip new lines void clean(char *data) { while (*data) { if (*data == '\n' || *data == '\r') *data = '\0'; data++; } } // for this, assume that the file contains 1 line no longer than 19 bytes // buffer is freed elsewhere char *load_latest_info(char *file) { FILE *f; char *buffer = (char*) malloc(20); if (f = fopen(file, "r")) if (fgets(buffer, 20, f)) { clean(buffer); return buffer; } free(buffer); return NULL; }

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• Python: saving objects and using pickle. Error using pickle.dump

  - by Peterstone

  Hello I have an Error and I don´t the reason: >>> class Fruits:pass ... >>> banana = Fruits() >>> banana.color = 'yellow' >>> banana.value = 30 >>> import pickle >>> filehandler = open("Fruits.obj",'w') >>> pickle.dump(banana,filehandler) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python31\lib\pickle.py", line 1354, in dump Pickler(file, protocol, fix_imports=fix_imports).dump(obj) TypeError: must be str, not bytes >>> I don´t know how to solve this error because I don´t understand it. Thank you so much.

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• Why isn't wchar_t widely used in code for Linux / related platforms?

  - by Ninefingers

  This intrigues me, so I'm going to ask - for what reason is wchar_t not used so widely on Linux/Linux-like systems as it is on Windows? Specifically, the Windows API uses wchar_t internally whereas I believe Linux does not and this is reflected in a number of open source packages using char types. My understanding is that given a character c which requires multiple bytes to represent it, then in a char[] form c is split over several parts of char* whereas it forms a single unit in wchar_t[]. Is it not easier, then, to use wchar_t always? Have I missed a technical reason that negates this difference? Or is it just an adoption problem?

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• How to send large objects using boost::asio

  - by Max

  Good day. I'm receiving a large objects via the net using boost::asio. And I have a code: for (int i = 1; i <= num_packets; i++) boost::asio::async_read(socket_, boost::asio::buffer(Obj + packet_size * (i - 1), packet_size), boost::bind(...)); Where My_Class * Obj. I'm in doubt if that approach possible (because i have a pointer to an object here)? Or how it would be better to receive this object using packets of fixed size in bytes? Thanks in advance.

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• Can someone explain this "endian-ness" function for me?

  - by Mike

  Write a program to determine whether a computer is big-endian or little-endian. bool endianness() { int i = 1; char *ptr; ptr = (char*) &i; return (*ptr); } So I have the above function. I don't really get it. ptr = (char*) &i, which I think means a pointer to a character at address of where i is sitting, so if an int is 4 bytes, say ABCD, are we talking about A or D when you call char* on that? and why? Would some one please explain this in more detail? Thanks. So specifically, ptr = (char*) &i; when you cast it to char*, what part of &i do I get?

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• Segmentation Fault when using "mov" in Assembly

  - by quithakay207

  I am working on a simple assembly program for a class, and am encountering an odd segmentation fault. It's a pretty simple program to convert bytes into kilobytes. However, within the function that does the conversion, I get a segmentation fault when I try to move the value 1024 into the ebx register. I've never had this kind of problem before when working with registers. Does someone know what could be causing this? I imagine it is something simple that I'm overlooking. Thank you! asm_main: enter 0,0 pusha mov eax, 0 mov ebx, 0 call read_int push eax call functionA popa mov leave ret functionA: mov eax, [esp + 4] call print_int call print_nl mov ebx, 1024 ;segmentation fault occurs here div ebx call print_int ret UPDATE: One interesting discovery is that if I delete the lines interacting with the stack, push eax and mov eax, [esp + 4], there is no longer a segmentation fault. However, I get a crazy result in eax after performing div ebx.

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• How to upload images to appengine from gwt

  - by user356083

  Related question I am having similar problems to what that guy had in his. My upload server returns aredirect Specifically, I am not sure what FormPanel.SubmitCompleteEvent.getResults() returns. Sometimes, I get html of an img: <img style="cursor: -moz-zoom-in;" alt="http://<myapp>.appspot.com/servePic?blob-key=abcdef" src="http://<myapp>.appspot.com/servePic?blob-abcdef" height="1" width="1"> Sometimes I get the image data in bytes. Behavior varies on I dunno what. I get the first in development, and the second in production. Does anyone know anything about this?

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• using bash: write bit representation of integer to file

  - by theseion

  Hullo First, I want to use bash for this and the script should run on as many systems as possible (I don't know if the target system will have python or whatever installed). Here's the problem: I have a file with binary data and I need to replace a few bytes in a certain position. I've come up with the following to direct bash to the offset and show me that it found the place I want: dd bs=1 if=file iseek=24 conv=block cbs=2 | hexdump Now, to use "file" as the output: echo anInteger | dd bs=1 of=hextest.txt oseek=24 conv=block cbs=2 This seems to work just fine, I can review the changes made in a hex editor. Problem is, "anInteger" will be written as the ASCII representation of that integer (which makes sense) but I need to write the binary representation. How do I tell the command to convert the input to binary (possibly from a hex)?

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