请问有人可以解释MSDN中的表达式后面的含义吗？ [英] Please can somebody explain the the meaning following expression found in MSDN?

问题描述

请问有人可以解释MSDN中的表达式后面的含义吗？



在INT_PTR的描述中，它说指针精度的有符号整数类型。在为指针算术运算整数时使用指针。



为指针运算生成指向整数的指针是什么意思。任何人都可以解释这是什么意思用一行代码表示？





见相关问题：



http://www.codeproject.com/Questions/729747/Please-when-is-it-best-right-to-use-the-new-data-t



http://www.codeproject.com/Questions/729713/Can-the-following-code-run-on-64bit-system



msdn页面位于：



http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85 ）.aspx

解决方案

_PTR类型（如DWORD_PTR）在API中非常有用，其中值的含义是用户 - 定义。多个Windows API允许存储用户定义的数据值。这可以是整数或指针。尝试在32位DWORD中存储64位指针将不起作用。 DWORD_PTR处理这个问题。



示例：ComboBox，ListBox，ListCtrl，TreeCtrl。



http://msdn.microsoft.com/en-us/library/43y9kx83.aspx

http://msdn.microsoft的.com / EN-US /库/ 287styts.aspx

Please can somebody explain the the meaning following expression found in MSDN?

In the description for INT_PTR , it says,"A signed integer type for pointer precision.Used when casting a pointer to an integer for pointer arithmetic."

What does it mean by " casting a pointer to integer for pointer arithmetic."Can anyone explain what this means with a line of code?


See related questions at:

http://www.codeproject.com/Questions/729747/Please-when-is-it-best-right-to-use-the-new-data-t

http://www.codeproject.com/Questions/729713/Can-the-following-code-run-on-64bit-system

The msdn page is located at:

http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx

解决方案

The "_PTR" types (like DWORD_PTR) are useful in APIs where the meaning of the value is user-defined. Several Windows APIs allow storing a user defined data value. This could be an integer or a pointer. Trying to store a 64 bit pointer in a 32 bit DWORD won't work. DWORD_PTR takes care of that.

Examples: ComboBox, ListBox, ListCtrl, TreeCtrl.

http://msdn.microsoft.com/en-us/library/43y9kx83.aspx
http://msdn.microsoft.com/en-us/library/287styts.aspx

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