structure | 易学教程

Web Application (Django) typical project folder structure

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问题 I am very new to web development, just wanted to figure out if there is a recommended(preferred) project folder structure to use (may be even specific to Django based projects). Thank you. 回答1: I've seen a few opinions on this: http://jacobian.org/writing/django-apps-with-buildout/ http://github.com/garethr/django-project-templates http://www.stereoplex.com/2008/dec/2/fez-djangoskel-django-projects-and-apps-as-eggs/ If you're new to web development though, you might want to consider just

Python, ctypes, multi-Dimensional Array

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问题 I have structure in Python code and in C code. I fill these fields ("bones_pos_vect",((c_float*4)*30)), ("bones_rot_quat",((c_float*4)*30)) in python code with the right values, but when I request them in C code, I get only 0.0 from all array cells. Why do I lose the values? All other fields of my structures work fine. class SceneObject(Structure): _fields_ = [("x_coord", c_float), ("y_coord", c_float), ("z_coord", c_float), ("x_angle", c_float), ("y_angle", c_float), ("z_angle", c_float), (

How to declare a structure in a header that is to be used by multiple files in c?

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If I have a source.c file with a struct: struct a { int i; struct b { int j; } }; How can this struct be used in another file (i.e. func.c )? Should I create a new header file, declare the struct there and include that header in func.c ? Or should I define the whole struct in a header file and include that in both source.c and func.c ? How can the struct be declared extern in both files? Should I typedef it? If so, how? if this structure is to be used by some other file func.c how to do it? When a type is used in a file (i.e. func.c file), it must be visible. The very worst way to do it is

Java many to many association map

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问题 I have two classes, ClassA and ClassB , as well as a "many to many" AssociationClass . I want a structure that holds the associations between A and B so that I can find the counterpart for each instance of A or B. I thought of using a Hashmap, with pair keys: Hasmap<Pair<ClassA, ClassB>, AssociationClass> associations; This way, I can add and remove an association between two instances of ClassA and ClassB , and I can query a relation for two given instances. However, I miss the feature of

Double alignment

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Following the discussion from this post , I have understood that the main reason for the alignment of structure members is performance (and some architectures restrictions). If we will investigate Microsoft (Visual C++), Borland/CodeGear (C++-Builder), Digital Mars (DMC) and GNU (GCC) when compiling for 32-bit x86: The alignment for int is 4 bytes and if int is not aligned, it can happen that 2 rows of memory banks will be read. My question is why not to make double to be 4 bytes aligned also? 4 bytes aligned double also will cause 2 rows of memory banks reading.... For example in the

Which SQL command can I use to see the structure of a table on SQL Server?

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问题 I have a table on a SQL Server and I would like to export its structure to send to a colleague. Which SQL command should I issue to get the structure? I don't have access to the SQL Server Management Studio. 回答1: sp_help '<TableName>' will give you the structure of a table Also you can use the information_Schema to get a detailed information, SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'TableName' Check this out http://msdn.microsoft.com/en-us/library/ms186778.aspx

Accessing the underlying struct of a PyObject

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问题 I am working on creating a python c extension but am having difficulty finding documentation on what I want to do. I basically want to create a pointer to a cstruct and be able to have access that pointer. The sample code is below. Any help would be appreciated. typedef struct{ int x; int y; } Point; typedef struct { PyObject_HEAD Point* my_point; } PointObject; static PyTypeObject PointType = { PyObject_HEAD_INIT(NULL) 0, /*ob_size*/ "point", /*tp_name*/ sizeof(PointObject), /*tp_basicsize*/

Quickest way to initialize an array of structures to all-0's?

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问题 I'm trying to initialize an array of structures to all-0's, using the below syntax: STRUCTA array[MAX] = {0}; However, I'm getting the following warning from gcc : warning: missing braces around initializer What am i doing wrong - is there another/better way to do this ? 回答1: It the first member of your struct has a scalar type, use STRUCTA array[MAX] = {{ 0 }}; If the first member of your struct happens to be another struct object, whose first member has scalar type, then you'll have to use

Inner class accessing outer class [duplicate]

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问题 This question already has answers here : Inner Class access to Outer Class members (5 answers) Closed 4 years ago . I am relatively new to C++, and I have looked a lot for an answer for this thing but I never got a satisfying answer. Let's say I have a structure called FSM . Eventually in my code, multiple instances of FSM can be created. One of FSM 's attributes is int X which is not static, every instance of FSM should have its own value for X . Now, one of FSM 's attributes is another

Casting a byte array to a managed structure

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Update: Answers to this question helped me code the open sourced project AlicanC's Modern Warfare 2 Tool on GitHub . You can see how I am reading these packets in MW2Packets.cs and the extensions I've coded to read big endian data in Extensions.cs . I am capturing UDP packets of Call of Duty: Modern Warfare 2 using Pcap.Net in my C# application. I receive a byte[] from the library. I tried to parse it like a string, but that didn't work well. The byte[] I have has a generic packet header, then another header specific to the packet type then info about each player in the lobby. A helpful person