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问题 I am not getting why this error is coming i serach in net and not able to get answer . Technologies using : C# Visual Studio for debugging the project I have a code private void InitializeWatcher(string sourceDirectoryPath, string watcherFilter, bool isWatcherIncludeSubdirectories) { objWatcher = new FileSystemWatcher(); objWatcher.IncludeSubdirectories =isWatcherIncludeSubdirectories; objWatcher.InternalBufferSize = 16384; if (Utilities.LogLevel >= Utilities.Informational) { Utilities

问题 I have to perform some necessary steps before installing my package, such as taking back up of previous datastore snapshot. For that purpose I'm using a %pre script as follows. %pre #!/bin/sh -------- -------- stamp=`date +%Y%m%d%H%M%S` echo ${stamp} ------------- ------------- The output is as follows: 20161103123325OURCE It is printing some random characters along with date. "OURCE" is not present anywhere in my spec file. The same script works perfectly as standalone. The platform is

问题 I have to perform some necessary steps before installing my package, such as taking back up of previous datastore snapshot. For that purpose I'm using a %pre script as follows. %pre #!/bin/sh -------- -------- stamp=`date +%Y%m%d%H%M%S` echo ${stamp} ------------- ------------- The output is as follows: 20161103123325OURCE It is printing some random characters along with date. "OURCE" is not present anywhere in my spec file. The same script works perfectly as standalone. The platform is

问题 I have a dataframe that looks like this: A B C 1 1 8 3 2 5 4 3 3 5 8 1 and I want to count the values so to make df like this: total 1 2 3 2 4 1 5 2 8 2 is it possible with pandas? 回答1: With np.unique - In [332]: df Out[332]: A B C 1 1 8 3 2 5 4 3 3 5 8 1 In [333]: ids, c = np.unique(df.values.ravel(), return_counts=1) In [334]: pd.DataFrame({'total':c}, index=ids) Out[334]: total 1 2 3 2 4 1 5 2 8 2 With pandas-series - In [357]: pd.Series(np.ravel(df)).value_counts().sort_index() Out[357]:

问题 I need to find a way to use mmap instead of malloc. How is this possible? (I am not using libc only syscalls) And yes brk() is possible. I used sbrk() but realized its not sys-call... (x86 inline assembly) I've been looking around and saw this: How to use mmap to allocate a memory in heap? But it didn't help for me, because I had a segfault. Basically, all I want to do a create 3 slabs of memory for storing characters. Say, char * x = malloc(1000); char * y = malloc(2000); char * z = malloc

问题 Im using sqlite db in a sample rails application. From my users table, i have cleared all records using User.delete_all . But now whenever i insert a new record in the table using User.create , the id is starting at a value which is one more than the id of the last record which was there in the table. For example, if my table had 5 records and i cleared all, then when i do User.create, its starting at id 6. Is there any way i can make the id start from 1 again ? Thank You 回答1: Similar

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago . Improve this question Is is it possible to set a limited number of reviews to display on the product page under the review tab? Currently some of my products have 40 reviews and to display them all on a single page takes up too much space. Is there a way to limit the number of reviews to say 3, and

问题 I started deploying my demo Angular 9 application on AWS lambda and provide SSR. In order to achieve this, I used @ng-toolkit/universal and @ng-toolkit/serverless. Deployment happened successfully but demo application is not opening. Upon investigating AWS lambda logs, I found the following exception. Here is the package.json, where I have added express js in dependencies. { "name": "my-appg", "version": "0.0.0", "scripts": { "ng": "ng", "start": "ng serve", "build": "ng build", "test": "ng

问题 struct DATAs { char data1; short data2; short data3; float data4; int data5; short data6; unsigned short data7; short data8; char data9; }; void fixFile(char* filename) { std::ifstream InputFile; InputFile.open(filename, std::ios::binary); DATAs FileDatas; InputFile.read(reinterpret_cast<char*>(&FileDatas), sizeof(FileDatas)); } Why do I need to use "reinterpret_cast" for the reading instead of "InputFile.read(&FileDatas, sizeof(FileDatas))" ? 回答1: The type of the first argument to std:

问题 I have 2 tables, one of them has 2 foreign keys and another has 2 composite foreign keys in it. Whenever I try to run the query, it says error and could not create constraint or index. So I have two tables here. I know I'm completely wrong, I apologize for that as I'm kind of new to coding. create table Booking ( BookingID char(4) primary key, dateBooked datetime not null, creditCard char(16) null, expiryDate datetime not null, CVC char (3) not null, confirmationID char(4) not null,