structure

pointer to one struct in another, writing and reading it from file gives SegFault

左心房为你撑大大i 提交于 2019-12-23 19:40:32
问题 I am brushing up my C skills from Learn C The Hard Way, currently I am at 17th Exercise. I am doing the 'Extra Credits' part. Making the database code given on that page to get I am trying to "Change the code to accept parameters for MAX_DATA and MAX_ROWS, store them in the Database struct, and write that to the file, thus creating a database that can be arbitrarily sized" So, I commented out the #define directives, and changed Address and Database structs as given: struct Address { int id;

Invalid operands to binary * (have ‘ab {aka struct a}’ and ‘ab * {aka struct a *}’)

橙三吉。 提交于 2019-12-23 19:07:27
问题 I wrote a program to swap two structures in an array and my coding is as follows #include <stdio.h> struct a { char *name; int id; char *department; int num; }; typedef struct a ab; void swap(ab *, ab *); int main(int argc, char *argv[]) { ab array[2] = {{"Saud", 137, "Electronics", 500}, {"Ebad", 111, "Telecom", 570}}; printf("First student data:\n%s\t%d\t%s\t%d", array[0].name, array[0].id, array[0].department, array[0].num); printf("\nSecond Student Data\n%s\t%d\t%s\t%d\n", array[1].name,

Aligned vs. Packed attributes

纵然是瞬间 提交于 2019-12-23 19:00:30
问题 I am working on firmware for a 16-bit PIC and writing in C (Microchip C30 compiler). My device receives a long list of bytes from an external device, and then I am trying to copy those bytes into a structure. The structure is defined as follows: typedef struct __attribute__((__packed__)) { char F1Nickname[17]; char F2Nickname[17]; DWORD F1CurrentPos; DWORD F2CurrentPos; WORD F1CurrentTemp; WORD F2CurrentTemp; DWORD F1MaxPos; DWORD F2MaxPos; BYTE F1TempCompOn; BYTE F2TempCompOn; BYTE CheckSum;

How to initialize array of structures with?

无人久伴 提交于 2019-12-23 17:25:29
问题 struct SampleStruct { int a; int b; float c; double d; short e; }; For an array like this, I used to initialize it as below: struct SampleStruct sStruct = {0}; I would like to know when I declare array of this structure, I thought this will be correct struct SampleStruct sStructs[3] = {{0},{0},{0}}; But, below also got accepted by the compiler struct SampleStruct sStructs[3] = {0}; I would like to know the best and safe way and detailed reason why so. 回答1: $ gcc --version gcc (GCC) 4.6.1

Why do structure definitions have internal linkage?

筅森魡賤 提交于 2019-12-23 15:39:39
问题 (I am talking about C, but it also applies to class templates in C++) In header file, it is a custom to put all the DECLARATIONS, not definitions. However, we usually put structure definitions or class templates in header file as well without actually knowing why we can. This doesn't really make sense because they are definitions as well -- ONE DEFINITION RULE. (Yes, structure definitions and class templates don't cause any storage to set, but you still get "redefinition" error below which

JNA:what is the purpose of getFieldOrder() in structure class

最后都变了- 提交于 2019-12-23 09:30:28
问题 I am trying to call C++ function present within a dll file,C++ function takes structure object as parameter by reference,and function will assign values in that function, So in my java application in order to pass structure object to a function i did write like this: interface someinterface extends Library{ public static class strctclass extends Structure { public static class ByReference extends tTIDFUDeviceInfo implements Structure.ByReference {} public short xxx=0; public char yyy='0';

Storing file structure in PHP [closed]

♀尐吖头ヾ 提交于 2019-12-23 05:33:16
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . What is the best way to store a file structure, along with files, say from a Zip file? Currently each file is a row in the MySQL database, but obviously no structure can be read from that. I want to avoid storing a binary file. All files should be plain text. Each zip/file

Yii2 set config file for module

…衆ロ難τιáo~ 提交于 2019-12-23 05:25:10
问题 How can i create my config in Yii2? and return in it for example $new = 'new' and then use it in other class? My structure Module MyModule config (directory) config.php (here must be $new = 'new') function (directory) MyFunc ( here i need use variable from config) Thanks for help! code from <?php namespace module\MyModule\function; class MyFunc { private static function func() { here i need to get $new from config } } 回答1: set config file in Module class like below: class Module extends \yii

How to compare values from struct and array in ColdFusion?

自作多情 提交于 2019-12-23 05:13:06
问题 I have situation where I have to compare values from structure and array. My structure is created and populated with values from query. Array is created and populated with values from .csv file. Now I need to loop through each of them, compare specific values and then if they match move those values in the list. I will have to use that list later to update/insert records in two different tables. Here is my code for structure: <cfquery name="getRecords" datasource="test"> Select s.ID, f.OLDID,

How to know if javascript lib is still used in a website?

大憨熊 提交于 2019-12-23 04:53:18
问题 I'm working on a website which is quite a mess. In the <head> of the website about a zillion javascript libraries are loaded and I think many of them are not used anymore. The problem is that I'm not sure. In Python (my language of choice) there are always clear namespaces and using a capable Python editor (such as Pycharm) clearly highlights unused imports. I'm looking for something similar in html/javascript. I can of course start writing a comprehensive set of UI-tests (which I should do