查询词典 null function

If this function returns NULL, no exception has been raised and the caller should assume no current thread state is available.

如果这个函数返回 NULL，没有抛出异常，调用者会假定当前线程状态无效。

Programmatically check to determine if a function has returned null instead of an instance of an object.

异常助手如果结合"编辑后继续运行"来使用，将焕发难以置信的效率，我们下次就介绍"编辑后继续运行"。

If the specified memory block has been discarded or if the memory block has a zero-byte size, this function returns NULL.

如果指定的内存块已经被释放或者大小为0字节，该函数将返回NULL。

An important thing to note here is that ALL doesn't cause an aggregate function to consider NULL values.

使用All不会使聚集函数在执行时将空值包含在结果集中，只能使用NVL函数间接将空值转换成某个固定值，以使其能被包含在结果集中。

Even when an operation produces no output data, and lpOutBuf is NULL, the KernelIoControl function uses the variable pointed to by lpBytesReturned .

即使一个操作没有产生输出数据， lpOutBuf 是 NULL ， kerneliocontrol 函数使用 lpBytesReturned 参数指向的这个变量。

Wealso define a family of functions named an Anti de Sitter null height function on thetimelike surface.

尽管研究方法是类似的，但是在类时曲面情形可以得到很多新的几何信息。

If the app doesn't want to do anything special for this ID, it returns NULL, and the window function senses this and news up the appropriate default object.

如果程序不需要这个ID，则返回NULL，窗口函数根据返回值创建恰当的默认对象。

Upon this, we forward more deeply: the emergence of the null phenomenon and the removal method of it; the operator selection in Genetic algorithm; improvement of object function and the introduction of the punishment method, etc.

在此基础上，本文进行了深入的专题研究：零空间现象形成的原因及消除方法；遗传算法中选择操作的研究；目标函数的改善，惩罚机制的介入等，并取得了一系列的成果。

If this parameter is set to NULL or an empty string, the function retrieves the type and data for the key's unnamed value.

如果这个参数被设置成NULL或者空字符串，函数重新获得没有命名键值的类型或者数据。

In order to detect the nonlinear determinism, the method of surrogate is employed. The null hypothesis that a real system response is from a stationary Gaussian linear process distorted by an invertible, static, nonlinear measurement function is made and tested.

采用替代数据法对实际房间声学系统的非线性确定性进行检测，假设实际系统响应是由平稳高斯随机过程经可逆、静态的非线性函数变换而得到，然后对该假设进行检验。

I can do simple painting, carpentry and plumbing.

我能做简单的油漆、木工和修水管等工作。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。