Article last modified on 2002-5-20
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The information in this article applies to:
- Microsoft Windows Media Format SDK 7.0
- Microsoft Visual C++, 32-bit Editions, version 6.0, SP5
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Table of Contents
调试Windows Media SDK时出现的异常中断... 1
现象：... 1
原因：... 3
使用过Windows Media SDK的兄弟们，几乎都应该遇到过这种问题。我好像没有看到微软对此有所表示，不知道有没有专门针对于此的KB文章。
现象：当调试至下面代码的红色语句时，出现BreakPoint中断：
HRESULT AddAudioStream( DWORD dwFormatTag,
DWORD dwBitrate,
DWORD dwSampleRate,
DWORD dwChannels,
DWORD dwFlags,
IWMProfile *pIWMProfile,
IWMProfileManager
*pIWMProfileManager )
{
HRESULT hr = S_OK;
IWMStreamConfig *pIWMStreamConfig = NULL;
IWMMediaProps *pIMP = NULL;
IWMCodecInfo *pIWMInfo = NULL;
WAVEFORMATEX *pSaveWFX = NULL;
WM_MEDIA_TYPE *pType = NULL;
try
{
do
{
hr =
pIWMProfileManager->QueryInterface( IID_IWMCodecInfo,
(void **) &pIWMInfo );
if( FAILED( hr ) )
{
return hr;
}
DWORD i, j;
DWORD cCodecs;
hr = pIWMInfo->GetCodecInfoCount( WMMEDIATYPE_Audio,
&cCodecs );
对话框内容为：
[dialog Microsoft Visual C++]
User Breakpoint called from code at 0x77fa018c
它的定位：
DbgBreakPoint:
77FA018C int 3
VC的Output窗口打出这样的话：
HEAP[elcc.exe]: Invalid Address specified to RtlFreeHeap( 2d70000, 2d751f8 )
当时的堆栈调用信息为：
NTDLL! DbgBreakPoint address 0x77fa018c
NTDLL! RtlpNtEnumerateSubKey + 19613 bytes
NTDLL! RtlpNtEnumerateSubKey + 16147 bytes
NTDLL! RtlDestroyHandleTable + 1918 bytes
NTDLL! 77fcba9e()
MSMS001! VoodooUnQuery + 28632 bytes
MSMS001! VoodooUnQuery + 27049 bytes
MSMS001! VoodooUnQuery + -3737 bytes
VCT3216! Dcmp
其实很久以来，在新闻组中大约有6、7个人说过这个问题，但是一直没有人回答为什么和怎么解决。
比如，Ed Eichman说：
I had quite a few problems getting the genprofile sample [from
the Windows Media Format SDK] to do ANYTHING on my machine besides
giving user breaks with HEAP[genprofile.exe]: Invalid Address
specified to RtlFreeHeap( 4d70000,4d73f30 ) until I got tired of
hitting OK. Stack crawl was something "helpful" like:
NTDLL! 77f7629c()
NTDLL! 77f8c4de()
NTDLL! 77f7e587()
NTDLL! 77f64f43()
MSMS001! 04d17b68()
MSMS001! 04d17539()
MSMS001! 04d0fcf7()
VCT3216! 044a4326()
比如，Malcolm Nixon说：
Whenever I try executing
the pIWMAudioWriter->SetOutputFormat(...) line the program
prints the following message then faults:
HEAP[WMATest.exe]: Invalid Address specified to
RtlFreeHeap( 2460000, 2d00000 )
I've tried different arguments to SetOutputFormat but to
no avail.
原因：
看着下面的output报告，这些加载的DLL都是在执行初始化Windows Media Format SDK的IWMWriter接口时加载的：
LOAD_DLL base:04600000 msdmo.dll
LOAD_DLL base:53600000 DEFFILE.dll
LOAD_DLL base:74F10000 IMAADP32.dll
LOAD_DLL base:75CE0000 MSADP32.dll
LOAD_DLL base:74EF0000 MSG711.dll
LOAD_DLL base:74EC0000 MSGSM32.dll
LOAD_DLL base:74EB0000 TSSOFT32.dll
LOAD_DLL base:661D0000 tsd32.dll
LOAD_DLL base:74F00000 lhacm.dll
LOAD_DLL base:74ED0000 msg723.dll
LOAD_DLL base:63F40000 IAC25_32.ax
LOAD_DLL base:1C200000 MSAUD32.ACM
LOAD_DLL base:04F40000 sl_anet.acm
LOAD_DLL base:04F60000 VCT3216.acmLOAD_DLL base:04F80000 vct3216.dll
LOAD_DLL base:057F0000 MSMS001.vwpLOAD_DLL base:05C70000 mvoice.vwp
OutDbStr: HEAP[CallDesigner.exe]:
OutDbStr: Invalid Address specified to RtlFreeHeap( 5860000, 5864228 )
红色的DLL就是根源!
VCT3216.acm就在你的%System32%目录下。它是一个audio codec driver。但是它的调试版本中由于某种原因有异常行为。
你可以删除它。但是据Ed Eichman说并不解决问题。
也可以选择pass这个breakpoint对话框，但是你必须连续跳过这个对话框214次!J
我确实这么做过，连续按了214次F5，和214次确定，终于通过了地雷阵。J
你可以看到这最后一次的output之后，是加载另一个DLL，说明异常确实发生在这几个acm和vwp中：
OutDbStr: HEAP[CallDesigner.exe]:
OutDbStr: Invalid Address specified to RtlFreeHeap( 5860000, 6144140 )
LOAD_DLL base:063F0000 l3codeca.acm
OutDbStr: Enter InitWriter
做VirtualDub video免费程序的作者，在MSMS001.vwp中也步入了同样的怪圈。MSMS001.vwp和VCT3216.acm一样，都是Voxware family of codecs的一部分。
不过看样子，人家并不打算修正这个问题。
所以，你可以买一个自动击键器预备着。
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