PyTypeObject 我们说过任意一个PyObject的实例创建过程中,需要知道类型名,需要分配的堆内存,以及该对象实例配套的行为(即函数指针),这些信息均包含在PyTypeObject实例中,注意我的描述,这个关键字定义必须牢记。 重要概念: PyTypeObject实例是指在CPython3.x源码中,满足“Py<类型名称>_Type”这样的命名风格的结构体初...
In addition, if a function argument is explicitly declared to be a pointer type (such as POINTER(c_int)) in argtypes,an object of the pointed type (c_int in this case) can be passed to the function. ctypes will apply the required byref()conversion in this case automatically. (2)几种...
2.1.2 缓存变量 缓存变量可以通过$CACHE{<name>} 语法来引用,而设置一个缓存变量使用set(<variable> <value> CACHE <type> <docstring> [FORCE])指令,与用于普通变量的set() 指令相比,缓存变量的设定中有一些必需参数和关键字(CACHE &FORCE)。与环境变量不同的是,缓存变量是CMake进程在配置阶段收集相关信息后...
When the C++ Standard Library is used, it forbids the mixing of object files and static libraries that are compiled by using different versions into one binary (EXE or DLL), and forbids the passing of C++ Standard Library objects between binaries that are compiled by using different versions. ...
Py_ssize_t ob_refcnt;struct_typeobject*ob_type;} PyObject; 我们看到以上便是PyObject的内部信息,我们先来看看_PyObject_HEAD_EXTRA,这是一个宏,如果将其展开的话: #ifdefPy_TRACE_REFS/* Define pointers to support a doubly-linked list of all live heap objects. */#define_PyObject_HEAD_EXTRA \...
(resolution, "width", width); height = cJSON_CreateNumber(resolution_numbers[index][1]); if (height == NULL) { goto end; } cJSON_AddItemToObject(resolution, "height", height); } string = cJSON_Print(monitor); if (string == NULL) { fprintf(stderr, "Failed to print ...
原文在Type conversions一节 Inaddition,ifafunctionargumentisexplicitly declaredtobe a pointertype(suchasPOINTER(c_int))inargtypes,anobjectofthe pointedtype(c_intinthiscase) can be passedtothefunction. ctypes will apply the required byref()conversioninthiscaseautomatically. ...
cpython中始终通过PyObject*类型的指针来访问对象, 类型PyObject是一个仅包含引用计数和类型指针(type pointer)的结构. 1.2. 介绍最重要的对象PyObject 从上面的介绍中可以看到对象PyObject特别重要, 它定义在文件Include/object.h中, 如下: /* Nothing is actually declared to be a PyObject, but every pointer...
//The following example attaches an HWND to the CWindow object and //calls CWindow::GetClientRect() to get the client area rectangle //of the window CWindow myWindow; myWindow.Attach(hWnd); RECT rc; myWindow.GetClientRect(&rc); CWindow::GetDC 检索工作区的显示上下文。 复制 HDC Get...
;cJSON_AddItemToObject(cjson_test, "skill", cjson_skill);/* 添加一个值为 False 的布尔类型的JSON数据(添加一个链表节点) */cJSON_AddFalseToObject(cjson_test, "student");/* 打印JSON对象(整条链表)的所有数据 */str = cJSON_Print(cjson_test);printf("%s\n", str);return 0;}...