WDK中提示的Warning

最新推荐文章于 2024-01-12 16:27:49 发布

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最新推荐文章于 2024-01-12 16:27:49 发布

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分类专栏：驱动开发文章标签： Microsoft Access C C++ C#

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本文探讨了WDK编译过程中出现的警告信息，包括内存泄漏警告、DriverUnload成员访问警告及变量检查警告等，并提供了相应的解决建议。

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以前从来没有注意WDK在编译之后，虽然没有在build的时候直接提示警告信息，但是会在ORCA的一个界面中提示程序中存在的一些Warnning,比如：

警告实例1：

warning 28197: Possibly leaking memory 'pMacInfo'：

如果你上网查找这个错误：http://msdn.microsoft.com/en-us/library/aa468922.aspx

那你就会发现，在程序中忘记了释放已经分配的内存：

        pMacInfo =  (PDOT11_MAC_INFO)NdisAllocateMemoryWithTagPriority(pFilter->FilterHandle, sizeof(DOT11_MAC_INFO), FILTER_ALLOC_TAG, LowPoolPriority);
		NdisZeroMemory(pMacInfo,sizeof(DOT11_MAC_INFO));
	    DEBUGP(DL_TEST,("sizeof DOT11_MAC_INFO is%u!\n",sizeof(DOT11_MAC_INFO)));
		Status = filterDoInternalRequest(pFilter,
	                                  NdisRequestMethod,
									  Oid,
									  pMacInfo,
									  sizeof(DOT11_MAC_INFO),
									  sizeof(DOT11_MAC_INFO),
									  MethodId,
									  &BytesProcessed); 
....(略)
		 } 
       NdisFreeMemory(pMacInfo,0,0);

如果你没有NdisFreeMemory()这条语句，他就会提示说可能存在内存泄露。

警告实例2：

133 DriverObject->DriverUnload = FilterUnload;

filter.c(133) : warning 28175: The 'DriverUnload' member of _DRIVER_OBJECT should not be accessed by a driver: Access to this member may be permitted for certain classes of drivers. See the documentation for this warning for more information.
Found in function 'DriverEntry'

这里说成员DriverUnload不应该被驱动访问~ 没有找到原因，暂且记录！

警告实例3：

28193 - <Variable> holds a value that must be examined

 NdisQueryMdl(
            pMdl,
            (PVOID *)&pCopyData,
            &BufferLength,
            NormalPagePriority);
FILTER_ASSERT(pCopyData != NULL);// Exception will rise if no this statment

The driver should test the value of the specified variable, which was supplied by a function, but the driver is either not using the value or is overwriting the value without examining it.