extract | 易学教程

how to basically extract file with sevenzipsharp

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问题 I will extract files to usb from iso file with sevenzipsharp. For this, I download sevenzipsharp from vs nuget package manager and I coded (actually I couldn't :) ) this code . I dont take any error but It isnt working. Where do I make mistakes? Please write details. if (IntPtr.Size == 8) //x64 { SevenZip.SevenZipExtractor.SetLibraryPath(@"C:\Program Files\7-Zip\7z.dll"); } else //x86 { SevenZip.SevenZipCompressor.SetLibraryPath(@"C:\Program Files (x86)\7-Zip\7z.dll"); } using (var file = new

Extract data fields from XML into Excel

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问题 I have a huge Excel spreadsheet that contains records of Customers where each column is a field. There's a field called Demographics which contains survey results of Customers and it's entirely in XML format. That is each Customer has a survey result on their demographic info like Gender, Marital Status, Income, Age, etc. which is given in XML format. It is notable that the whole XML is like a big chunk of text in a cell of the spreadsheet which I can't use to analyze the data. The problem is

How can i Extract Files From VDI

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问题 I was using VirtualBox on my PC( WIN 7 ) I managed to View some files in my .VDI file.. How can I open or view the contents of my .vdi file and retrieve the files from there? 回答1: You can mount partitions from .vdi images using qemu-nbd : sudo apt install qemu-utils sudo modprobe nbd vdi="/path/to/your.vdi" # <<== Edit this sudo qemu-nbd -c /dev/nbd0 "$vdi" # view partitions and select the one you want to mount. # Using parted here, but you can also use cfdisk, fdisk, etc. sudo parted /dev

MATLAB: Extract multiple parts of a matrix without using loops

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问题 I have a huge 2D matrix and I would like to extract 15 different 100x100 parts out of it. I have two vectors x and y where the top left indices of the parts are saved. I have used something like this: result = cam1(x(1:end):(x(1:end)+99), y(1:end):(y(1:end)+99)); but the result is just a 100x100 matrix instead of a 15x100x100. Why? I know it could easily be done using a loop but we are not allowed to use loops (it's part of an image processing exercise). Another possbility would be to write

How to select part of a Timestamp in a SQL Query

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问题 In the DB I am working with, I want to select only the year from a specific TimeStamp field. In particular, I'm hoping to select the unique years from this database column. For instance, if all of the timestamps in the field "ModifyTimeStamp" are either from the year 2002 or the year 2006, I would like returned simply a result of '2002' and '2006'. If this is impossible, I'd be content with getting a result of a bunch of '2002's mixed with '2006's and would parse it later. All I've been able

How does the function “extract” deal with different projections?

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I need to use the function extract() to do a weighted average extraction from a raster using a grid cell of equal sized squares. My polygon grid is in UTM21n and the raster is in GCS WGS84 datum D. Do I have to reproject the raster before using it into extract()? Or will the function handle it properly? You can find the source code of function extract for SpatialPolygons here . The code starts with the following snippet: setMethod('extract', signature(x='Raster', y='SpatialPolygons'), function(x, y, fun=NULL, na.rm=FALSE, weights=FALSE, cellnumbers=FALSE, small=FALSE, df=FALSE, layer, nl,

iOS PDF to plain text parser

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I'm quite at a lost on this subject. I've read pretty much every post about it here on SO, I would very much appreciate it if somebody would nudge me in the right direction. I have a PDF and I would like to extract it's text, I'm only interested in words and spaces. I have setup a CGPDFScanner and it's callback methods. What I have read is that I only need to consider 4 operators TJ, Tj, qout(') and doubleqout(") as far as extracting text goes. I guess I also need to keep track of the text space to be able to determine whether the letters should be put together to form a word or should be

How to extract data from a file in C

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问题 I have a .dat file containing 6 columns of N numbers like so: -4.997740e-01 -1.164187e+00 3.838383e-01 6.395961e+01 -1.938013e+02 -4.310365e-02 -1.822405e+00 4.470735e-01 -2.691410e-01 -8.528020e+01 -1.358874e+02 -7.072167e-01 9.932887e-01 -2.157249e+00 -2.303825e+00 -5.508925e+01 -3.548236e+02 1.250405e+00 -1.871123e+00 1.505421e-01 -6.550555e-01 -3.254452e+02 -5.501001e+01 8.776851e-01 1.370605e+00 -1.028076e+00 -1.137059e+00 6.096598e+01 -4.472264e+02 -1.268752e+00 ............ ...........

How to extract a part of a matrix with condition in Matlab

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问题 I have a sat of matrices and I want to extract only a part of the matrix that satisfy a condition. For example: values of the 150x180 matrix goes from 0 to 2.80 and I only want those between 1.66 and 1.77 I want to keep the values within the rang in their original location in the original matrix and set the other to zero. can anybody help me please. Thank you 回答1: You can use logical indexing. First, find A entries that do not satisfy your conditions. Next, using A(idx) change them to 0: %

MATLAB - extract selected rows in a table based on some criterion

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Let's say I have a table like this: post user date ____ ____ ________________ 1 A 12.01.2014 13:05 2 B 15.01.2014 20:17 3 A 16.01.2014 05:22 I want to create a smaller table (but not delete the original one!) containing all posts of - for example - user A including the dates that those were posted on. When looking at MATLAB's documentation (see the very last part for deleting rows) I discovered that MATLAB allows you to create a mask for a table based on some criterion. So in my case if I do something like this: postsA = myTable.user == 'A' I get a nice mask vector as follows: >> postsA = 1 0