Fbwf Api功能的问题 [英] Problems with Fbwf Api functions
问题描述
我正在调用FbwfGetVolumeList / FbwfFindFirst / FbwfFindNext / FbwfFindClose来查看缓存覆盖的内容，并想问几个问题。非常感谢您的帮助。
1）我获得了FbwfGetVolumeList的返回值234。在http://msdn.microsoft.com/en-us/library/bb521702%28WinEmbedded.51%29.aspx上，我看到No_Error，Error_Invalid_Parameter和Error_More_Data。我如何破译"234"。成为其中一个价值观？你能让我知道我做错了吗（在下面的代码中）？
2）我使用下面的代码为我的FbwfFindFirst和FbwfFindNext获得1的返回值。
我也尝试过使用"C："。相反，在我的FbwfFindFirst中，是WCHAR szDrive [10] = L" C：" ;;
iErr = FbwfFindFirst（szDrive，Cache_detail，& cdSize）;
得到了返回值234而不是1.我做错了什么？
我在下面列出了我的代码，以及我的重叠细节的结果。
代码：
=====
ULONG ulCurrentSession = 1;
ULONG cbSize = 32;
BYTE * pszVolumnList = new BYTE [32];
PFbwfCacheDetail Cache_detail;
Cache_detail =（PFbwfCacheDetail）malloc（sizeof（FbwfCacheDetail））;
ULONG cdSize = sizeof（PFbwfCacheDetail）;
int iErr = FbwfGetVolumeList（ulCurrentSession，pszVolumnList，& cbSize） ; //返回值：iErr = 1
fprintf（输出，"FbwfGetVolumeList返回值％d \ n"，iErr）; // iErr = 1
PWSTR v = *（PWSTR *）（pszVolumnList + sizeof（PWSTR））;
iErr = FbwfFindFirst（v，Cache_detail，& cdSize） ; fprintf（输出，"FbwfFindFirst返回值％d \ n"，iErr）; // iErr = 1
fprintf（输出，"FbwfFindFirst fileName％s \ n"，Cache_detail-> fileName）; //在这里打出一些怪异的字符。
int i = 0;
int size = sizeof（pszVolumnList）;
while（i< size）
{
i ++;
iErr = FbwfFindNext（Cache_detail，& cdSize）;
fprintf（输出，"FbwfFindNext返回值％d \ n"，iErr）; // iErr = 1
fprintf（输出，"FbwfFindNext-Cache_detail％s \ n"，Cache_detail-> fileName）; //在这里打出一些怪异的字符。
}
iErr = FbwfFindClose（）;
fprintf（输出，"来自FbwfFindClose的错误％d \ n"，iErr ）;
重叠细节：
= =============
当前会话的基于文件的写过滤器配置：
过滤器状态：已启用。
叠加缓存数据压缩状态：已禁用。
叠加缓存阈值：64 MB。叠加缓存预分配：已禁用。
尺寸显示：实际模式。
受保护的卷列表：
\设备\HarddiskVolume1
写入每个受保护卷的列表：
\设备\硬盘磁盘1：
\我的目录< ---这是我运行上面代码生成的可执行文件的地方。
这些API将返回Win32错误代码，除非另有说明。错误234是ERROR_MORE_DATA。请参阅 http://msdn.microsoft.com/en-us/library/ms681382( VS.85）.aspx 获取Win32错误代码的完整列表。
在您的情况下，您需要检查cbSize并重试正确的大小，例如，
ULONG错误= ERROR_SUCCESS;
PFbwfCacheDetail cacheDetail = NULL;
ULONG size = 0;
error = FbwfFindFirst（L" C："，cacheDetail，& size ）;这将因ERROR_MORE_DATA而失败，但'size'将包含cacheDetail所需的缓冲区大小。将'size'字节分配给cacheDetail并重试该呼叫。
Sean Liming的文章可能有助于解决几个相关概念（ http://www.seanliming.com/Docs/FBWF_API.pdf ）
感谢
SRIKANTH
Hi, I am calling the FbwfGetVolumeList/FbwfFindFirst/FbwfFindNext/FbwfFindClose to look at the content of my cache overlay and would like to ask a few questions. Thanks a lot for helping.
1) I am getting a return value of 234 for FbwfGetVolumeList. On http://msdn.microsoft.com/en-us/library/bb521702%28WinEmbedded.51%29.aspx I see No_Error, Error_Invalid_Parameter, and Error_More_Data. How do I decipher "234" into one of these values? And could you let me know what I did wrong (in the codes below)?
2) I am getting a return value of 1 for my FbwfFindFirst and FbwfFindNext using the codes below.
I also tried using "C:" instead in my FbwfFindFirst,
WCHAR szDrive[10] = L"C:";
iErr = FbwfFindFirst(szDrive, Cache_detail, &cdSize);
and got a return value of 234 instead of 1. Am I doing anything wrong?
I've included my codes below, as well as a result of my overlay details.
CODES:
=====
ULONG ulCurrentSession = 1;
ULONG cbSize = 32;
BYTE *pszVolumnList = new BYTE[32];
PFbwfCacheDetail Cache_detail;
Cache_detail = (PFbwfCacheDetail)malloc (sizeof(FbwfCacheDetail));
ULONG cdSize = sizeof(PFbwfCacheDetail);
int iErr = FbwfGetVolumeList(ulCurrentSession, pszVolumnList, &cbSize); //Return value: iErr = 1
fprintf(output, "FbwfGetVolumeList return value %d\n", iErr); // iErr = 1
PWSTR v = * (PWSTR*) (pszVolumnList + sizeof(PWSTR));
iErr = FbwfFindFirst(v, Cache_detail, &cdSize);
fprintf(output, "FbwfFindFirst return value %d\n", iErr); // iErr = 1
fprintf(output, "FbwfFindFirst fileName %s\n", Cache_detail->fileName); // Prints out some weird looking characters here.
int i=0;
int size = sizeof(pszVolumnList);
while (i < size)
{
i++;
iErr = FbwfFindNext(Cache_detail, &cdSize);
fprintf(output, "FbwfFindNext return value %d\n", iErr); // iErr = 1
fprintf(output, "FbwfFindNext-Cache_detail %s\n", Cache_detail->fileName); // Prints out some weird looking characters here.
}
iErr = FbwfFindClose();
fprintf(output, "Error from FbwfFindClose %d\n", iErr);
OVERLAY DETAILS:
=============
File-based write filter configuration for the current session:
filters state: enabled.
overlay cache data compression state: disabled.
overlay cache threshold: 64 MB.
overlay cache pre-allocation: disabled.
size display: actual mode.
protected volume list:
\Device\HarddiskVolume1
write through list of each protected volume:
\Device\HarddiskVolume1:
\My Directory <--- This is where I ran my executable generated by the codes above.
These APIs will return Win32 error codes unless specified otherwise. Error 234 is ERROR_MORE_DATA . See http://msdn.microsoft.com/en-us/library/ms681382(VS.85).aspx for a full list of Win32 error codes.
In your case, you need to examine cbSize and retry with correct size, something like,
ULONG error = ERROR_SUCCESS;
PFbwfCacheDetail cacheDetail = NULL;
ULONG size = 0;
error = FbwfFindFirst(L"C:", cacheDetail, &size);
This will fail with ERROR_MORE_DATA but 'size' will contain the necessary buffer size for cacheDetail. Allocate 'size' bytes to cacheDetail and retry the call.
Sean Liming's article might help with several related concepts (http://www.seanliming.com/Docs/FBWF_API.pdf)
Thanks
Srikanth
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