在本文中，我们将不解释为什么会提示“纯虚拟函数调用”和如何提示“纯虚拟函数调用”，而是详细解释在win32平台的构造函数/析构函数中直接/间接调用纯虚拟函数时程序本身。在开始时，将显示一个经典示例，在这个示例中，它将提示一个带有“纯虚拟函数调用”的消息框。
/**
* "pure virtual function call" on win32 platform
* filename: testWin32PVFC.cpp
*/
#include <iostream>
#define PI 3.1415926
using namespace std;
class Shape
{
private:
double ValuePerSquareUnit;
protected:
Shape(double valuePerSquareUnit):
ValuePerSquareUnit(valuePerSquareUnit)
{
//error LNK2001: unresolved external symbol "public: virtual double __thiscall Shape::area(void)const " (?area@Shape@@UBENXZ)
//std::cout << "creating shape, area = " << area() << std::endl;
std::cout << "creating shape, value = " << value() << std::endl; //indirectly call pure virtual function in constructor
}
public:
virtual double area() const = 0;
double value() const
{
return ValuePerSquareUnit * area();
}
virtual ~Shape()
{
printf("Shape::~Shape() is called");
}
double getPerSquareUnit()
{
return ValuePerSquareUnit;
}
};
class Rectangle : public Shape
{
private:
double Width;
double Height;
public:
Rectangle(double width, double height, double valuePerSquareUnit):
Shape(valuePerSquareUnit),Width(width),Height(height)
{
}
virtual ~Rectangle() //can be removed
{
}
virtual double area() const
{
return Width * Height;
}
};
class Circle: public Shape
{
double Radius;
public:
Circle(double radius, double valuePerSquareUnit):
Shape(valuePerSquareUnit),Radius(radius)
{
}
virtual ~Circle() //can be removed
{
}
virtual double area() const
{
return PI * Radius * Radius;
}
};
int main()
{
Rectangle* pr = new Rectangle(30, 20, 10);
Circle* pc = new Circle(15, 10);
//invoke Rectangle::area()
printf("rectangle: area = %.2f, PerSquareUnit = %.2f, value = %.2f/n", pr->area(), pr->getPerSquareUnit(), pr->value());
//invoke Circle::area()
printf("circle : area = %.2f, PerSquareUnit = %.2f, value = %.2f/n", pc->area(), pc->getPerSquareUnit(), pc->value());
Shape* shape;
shape = pr;
printf("rectangle: area = %.2f, PerSquareUnit = %.2f, value = %.2f/n", shape->area(), shape->getPerSquareUnit(), shape->value());
shape = pc;
printf("circle : area = %.2f, PerSquareUnit = %.2f, value = %.2f/n", shape->area(), shape->getPerSquareUnit(), shape->value());
return 0;
}
简介
STATUS_NO_MEMORY，值为0xC0000017。代表的意思是"没有足够的虚拟内存或分页文件配额来完成指定的操作。"。它定义在 ntstatus.h头文件里，如下：
/
// MessageId: STATUS_NO_MEMORY
//
// MessageText:
//
// {Not Enough Quota}
// Not enough virtual memory or paging file quota is available to complete the specified operation.
//
#define STATUS_NO_MEMORY ((NTSTATUS)0xC0000017L) // winnt
异常结构填充
ExceptionAddress: 7706a44c (ntdll!RtlpAllocateHeapRaiseException+0x0000003b)
ExceptionCode: c0000017
ExceptionFlags: 00000000
NumberParameters: 1
Parameter[0]: 00000010//这个值暂时没整明白代表的意思，望知道的同仁告知
