在PHP扩展中封装C++类

Question

我正在学习在php扩展中包装c++类的教程。我使用的是wamp服务器和php5.4.16。

PHP_METHOD(Car, __construct)出现问题。

打电话给后

car_object *obj = ( car_object *) zend_object_store_get_object ( object TSRMLS_CC );

则CCD_ 2不是有效地址。当注释行obj ->car = car时，wamp没有关闭。所以我认为obj ->car不是有效或合法的地址。

下面是我的代码：

车辆.cc:

#include "php.h"
#include "car.h"
#define PHP_VEHICLES_EXTNAME  "vehicles"
#define PHP_VEHICLES_EXTVER   "0.1"
zend_object_handlers car_object_handlers;
struct car_object {
    zend_object std;
    Car *car;
};

zend_class_entry *car_ce;

void car_free_storage(void *object TSRMLS_DC)
{
    car_object *obj = (car_object *)object;
    delete obj->car; 
    zend_hash_destroy(obj->std.properties);
    FREE_HASHTABLE(obj->std.properties);
delete obj->car;
    efree(obj);
}
zend_object_value car_create_handler(zend_class_entry *type TSRMLS_DC)
{
    zend_object_value retval;
    car_object *obj = (car_object *)emalloc(sizeof(car_object));
    memset(obj, 0, sizeof(car_object));
    obj->std.ce = type;
    ALLOC_HASHTABLE(obj->std.properties);
    zend_hash_init(obj->std.properties, 0, NULL, ZVAL_PTR_DTOR, 0);
#if PHP_VERSION_ID < 50399
zval *tmp;
    zend_hash_copy(obj->std.properties, &type->default_properties,                                                                                                                                                    (copy_ctor_func_t) zval_add_ref, (void *)&tmp, sizeof(zval *));
    
    #else
        object_properties_init(&(obj->std), type);
    #endif

    retval.handle = zend_objects_store_put(obj, NULL, car_free_storage, NULL                                            TSRMLS_CC);
    retval.handlers = &car_object_handlers;
    return retval;
}
PHP_METHOD(Car, __construct)
{
long maxGear;
    Car *car = NULL;
    zval *object = getThis();
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &maxGear) == FAILURE) {
        RETURN_NULL();
    }
    car = new Car(maxGear);    
car_object *obj = ( car_object *) zend_object_store_get_object(object TSRMLS_CC                 );
//obj->car = car; 

}

...
...
zend_function_entry car_methods[] = {
    PHP_ME(Car,  __construct,     NULL, ZEND_ACC_PUBLIC | ZEND_ACC_CTOR)
    PHP_ME(Car,  shift,           NULL, ZEND_ACC_PUBLIC)
    PHP_ME(Car,  accelerate,      NULL, ZEND_ACC_PUBLIC)
    PHP_ME(Car,  brake,           NULL, ZEND_ACC_PUBLIC)
    PHP_ME(Car,  getCurrentSpeed, NULL, ZEND_ACC_PUBLIC)
    PHP_ME(Car,  getCurrentGear,  NULL, ZEND_ACC_PUBLIC)
    {NULL, NULL, NULL}
};

PHP_MINIT_FUNCTION(vehicles)
{
    zend_class_entry ce;
    INIT_CLASS_ENTRY(ce, "Car", car_methods);
    car_ce = zend_register_internal_class(&ce TSRMLS_CC);
    car_ce->create_object = car_create_handler;
    memcpy(&car_object_handlers, zend_get_std_object_handlers(),                    sizeof(zend_object_handlers));
    car_object_handlers.clone_obj = NULL;
    return SUCCESS;
}
zend_module_entry vehicles_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
    STANDARD_MODULE_HEADER,
#endif
    PHP_VEHICLES_EXTNAME,
    NULL,                  /* Functions */
    PHP_MINIT(vehicles),
    NULL,                  /* MSHUTDOWN */
    NULL,                  /* RINIT */
    NULL,                  /* RSHUTDOWN */
    NULL,                  /* MINFO */
#if ZEND_MODULE_API_NO >= 20010901
    PHP_VEHICLES_EXTVER,
#endif
    STANDARD_MODULE_PROPERTIES
};

ZEND_GET_MODULE ( vehicles );

car.h car.cc与教程中的内容相同。

我想我错过了什么。也许是对"；CCD_ 5"；函数car_create_handler中的错误。。

谢谢你的帮助。

Answer 1

在您的函数car_free_storage中，您似乎调用了delete obj->car两次。这可能不是个好主意。

此外，当我最近查看另一个php模块时，我发现obj->std.properties并不总是设置为有效地址。因此，在将其传递给zend_hash_destroy之前，可能值得检查它是否为0。我的代码是：

if(obj->std.properties){
    zend_hash_destroy(obj->std.properties);
    FREE_HASHTABLE(obj->std.properties);
}