structure

问题 I have an SQL table with basically the following structure: PK (int, primary key), userID (int), data (varchar 64) Basically, any user as defined by userID is allowed to store any number of short strings. However, no user is allowed to store two identical strings (although user 1 and user 2 can both store the same string separately). I would, if at all possible, like to implement this restriction at the database level because IMHO structural constraints should always be in the tables, as well

问题 As we all know, the common structure of rubygem assumes presence of lib directory. I noticed, that generally in this directory are two items: gem_name.rb and gem_name/ directory. The gem_name/ directory hold main sources of project. It is heart of application. So, the question is about gem_name.rb file. What does it stand for? 回答1: The reason it's structured like that is if you had files other than gem_name.rb in the lib/ directory (say another_file_name.rb ), you'd be liable to cause

问题 I'm having a problem getting the entry memory address to a member variable of a structure. I've tried in two ways, one of which didn't work properly. It would be very good if you guys give me some advice. First , i defined a structure named BITMAP_HEADER. struct BITMAP_HEADER { WORD bfType ; DWORD bfSize ; WORD bfReserved1 ; WORD bfReserved2 ; DWORD bfOffBits ; } ; Second , i defined and initialized some variables. please look at the code below before you read next line. In case you ask me

问题 I'm trying to produce code that will check how many "A", "C", "G", and "T" characters a char contains. But I'm a little unsure how to go about doing this.. because as far as I know there aren't any operators like .contains() to check with. The desired output would be something like: "The char contains (variable amount) of letter A's" In my code I have this right now: DNAnt countDNAnt(char strand) { DNAnt DNA; if (isupper(strand) == "A") { DNA.adenine++; } else if (isupper(strand) == "C") {

问题 I'm trying to add a structure to a singly linked list with the function g_slist_append(list, &structure). This seems to work (it's adding the pointer), however I can't seem to find a way to view the elements in the structure when reading the linked list. My structure looks like this: struct customstruct { int var1; int var2; char *string_1; } Then, I make a list: GSList *list = NULL; Then, I append one instance of the structure like this: struct customstruct list_entry; list_entry.var1 = 1;

问题 I'm trying to translate the following code from C++ to C# ` struct tPacket { WORD size; WORD opcode; BYTE securityCount; BYTE securityCRC; } ... static char data[8192] = {0}; tPacket * packet = (tPacket *)data;` so far I've come up with: C# public struct tPacket { public ushort size; public ushort opcode; public byte securityCount; public byte securityCRC; } public static byte[] data = new byte[1024]; tPacket packet = new tPacket(); packet = (tPacket *)data; However,I get an error "Cannot

问题 I have the below structures in JNA. I want to remove the padding and alignment in C using pragma pack. When I run it from C it runs fine. I'm using this DLL to be called from Java. When I call it the JVM is crashing. Would my settings I did in my DLLs apply when its called from Java? I tried adding setAlignment type to None. Still no help. In C this structure is weighing 405. It adds up perfectly meaning there is no padding or alignment. In java when I hover over the _report value while

问题 Dunno if I'm going the right way about this? The contents of the structure below is defined elsewhere. when I run the code it is just outputting a list of 4 zeros. any help would be greatly appreciated..... public class NativeMethods { public struct FT_DEVICE_LIST_INFO_NODE { public uint ID; public uint LocId; public string SerialNumber; public string Description; } [DllImportAttribute(@"C:\Users\Brendan\Documents\libMPSSE.dll", EntryPoint = "SPI_GetNumChannels")] public static extern uint

问题 I am trying to sort the order of a nested structure in descending order by a specified parameter. Please refer to the following nested structure: struct(1).otherStruct(1).name = 'A'; struct(1).otherStruct(1).classAve = 21; struct(1).otherStruct(2).name = 'B'; struct(1).otherStruct(2).classAve = 21; struct(1).otherStruct(3).name = 'C'; struct(1).otherStruct(3).classAve = 21; struct(2).otherStruct(1).name = 'D'; struct(2).otherStruct(1).classAve = 13; struct(2).otherStruct(2).name = 'E'; struct

问题 In my assignment, I have to write a function that takes as arguments a pointer to a "LNode" structure and an integer argument. Then, I have to not only add that integer into the linked list, but also put place it so that the list is in proper ascending order. I've tried several various attempts at this, and this is my code as of posting. LNode* AddItem(LNode *headPtr, int newItem) { auto LNode *ptr = headPtr; ptr = malloc(sizeof(LNode)); if (headPtr == NULL) { ptr->value = newItem; ptr->next