指针操作无效 - Delphi XE [英] Invalid Pointer Operation - Delphi XE

问题描述

我似乎没有想到这一个。我的程序编译并运行成功，但在调试过程中，只有在关闭程序时弹出一个消息框，指出指针操作无效。我精心检查了所有FormCloseQuery和FormDestory事件的任何语法或逻辑错误。我发现没有，他们按预期执行没有任何错误。

当我告诉编译器在无效指针操作错误中断时，它不会做任何事情，但挂起程序。在这一点上，我不得不终止或终止这个过程。

你如何看待这一个？

提前感谢

解决方案

当内存管理器尝试释放无效内存时，抛出无效的指针异常。有三种方法可以发生。

最常见的是因为您正在尝试释放已经释放的对象。如果您打开FastMM的FullDebugMode，它会检测到这一点，直接指向问题。 （但请确保构建一个地图文件，以便它具有创建有用的堆栈跟踪所需的信息。）

第二种方法是如果您尝试可用内存被分配到除内存管理器以外的其他位置。从Delphi EXE传递一个字符串到没有使用共享内存管理器功能的Delphi DLL时，我已经看过这个了。

第三种方法是直接用指针搞乱，可能不适用于你。如果您尝试 FreeMem 或 Dispose 一个不指代FastMM分配的实际内存块的错误指针，你会得到这个错误。

这很可能是第一个。使用FullDebugMode，您可以轻松找到问题的根源。

I can't seem to figure this one out. My program compiles and runs successfully, but during debugging only it pops up a message box saying "Invalid Pointer Operation" when shutting the program down. I have painstakingly checked all the FormCloseQuery and FormDestory events for any syntax or logical error. I found none and they execute as expected without any error.

When I do tell the compiler to break at Invalid Pointer Operation error, it doesn't do anything but hangs up the program. At which point, I had to terminate or kill the process.

How do you figure this one out?

Thanks in advance,

解决方案

An Invalid Pointer exception is thrown by the memory manager when it tries to free invalid memory. There are three ways this can happen.

The most common is because you're trying to free an object that you've already freed. If you turn on FastMM's FullDebugMode, it will detect this and point you directly to the problem. (But make sure to build a map file so it will have the information it needs to create useful stack traces from.)

The second way is if you're trying to free memory that was allocated somewhere other than the memory manager. I've seen this a few times when passing a string from a Delphi EXE to a Delphi DLL that wasn't using the shared memory manager feature.

And the third way involves messing around with pointers directly and probably doesn't apply to you. If you try to FreeMem or Dispose a bad pointer that doesn't refer to an actual block of memory allocated by FastMM, you'll get this error.

It's most likely the first one. Use FullDebugMode and you'll find the source of the problem easily.

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