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发布于 2024-10-10 21:51:10 字数 53 浏览 8 评论 0原文

我正在 Windows 上用 Mingw 编译一个程序。如何获取打开的文件描述符的访问模式？

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音盲 2024-10-17 21:51:11

根据 Win32.hlp，API 在 KERNEL32 中提供了函数 BOOL GetFileInformationByHandle(HANDLE hFile, LPBY_HANDLE_FILE_INFORMATION lpFileInformation)。 LPBY_HANDLE_FILE_INFORMATION是一个BY_HANDLE_FILE_INFORMATION*，其中BY_HANDLE_FILE_INFORMATION如下：

typedef struct _BY_HANDLE_FILE_INFORMATION { // bhfi  
    DWORD    dwFileAttributes; 
    FILETIME ftCreationTime; 
    FILETIME ftLastAccessTime; 
    FILETIME ftLastWriteTime; 
    DWORD    dwVolumeSerialNumber; 
    DWORD    nFileSizeHigh; 
    DWORD    nFileSizeLow; 
    DWORD    nNumberOfLinks; 
    DWORD    nFileIndexHigh; 
    DWORD    nFileIndexLow; 
} BY_HANDLE_FILE_INFORMATION;

调用该函数后，如果返回true，则BY_HANDLE_FILE_INFORMATION code> 包含与您的文件相关的数据。 dwFileAttributes 可能包含 FILE_ATTRIBUTE_READ_ONLY 标志。

如果您想要更多，还有：

BOOL GetKernelObjectSecurity(
 HANDLE Handle,                             // handle of object to query
 SECURITY_INFORMATION RequestedInformation, // requested information
 PSECURITY_DESCRIPTOR pSecurityDescriptor,  // address of security descriptor
 DWORD nLength,                             // size of buffer for security descriptor 
 LPDWORD lpnLengthNeeded                    // address of required size of buffer
);

API 参考对于 SECURITY_DESCRIPTOR 的含义必然是模糊的，但您可以使用其地址作为参数来调用一堆其他函数来获取特定属性。 SECURITY_INFORMATION 只是一个 DWORD 常量，指定您计划调用其中哪个函数。您可以在 http://msdn.microsoft 找到更多信息.com/en-us/library/aa446641%28VS.85%29.aspx

编辑 - 第二个代码部分看起来总是很奇怪，但是 API 参考的链接将引导您到达您需要去的地方，如果你稍微挖掘一下。

According to Win32.hlp, the API supplies the function BOOL GetFileInformationByHandle(HANDLE hFile, LPBY_HANDLE_FILE_INFORMATION lpFileInformation) in KERNEL32. LPBY_HANDLE_FILE_INFORMATION is a BY_HANDLE_FILE_INFORMATION*, where BY_HANDLE_FILE_INFORMATION is as follows:

typedef struct _BY_HANDLE_FILE_INFORMATION { // bhfi  
    DWORD    dwFileAttributes; 
    FILETIME ftCreationTime; 
    FILETIME ftLastAccessTime; 
    FILETIME ftLastWriteTime; 
    DWORD    dwVolumeSerialNumber; 
    DWORD    nFileSizeHigh; 
    DWORD    nFileSizeLow; 
    DWORD    nNumberOfLinks; 
    DWORD    nFileIndexHigh; 
    DWORD    nFileIndexLow; 
} BY_HANDLE_FILE_INFORMATION;

After calling said function, if it returns true, the BY_HANDLE_FILE_INFORMATION contains data pertinent to your file. dwFileAttributes may contain the FILE_ATTRIBUTE_READ_ONLY flag.

If you want more than that, there is also:

BOOL GetKernelObjectSecurity(
 HANDLE Handle,                             // handle of object to query
 SECURITY_INFORMATION RequestedInformation, // requested information
 PSECURITY_DESCRIPTOR pSecurityDescriptor,  // address of security descriptor
 DWORD nLength,                             // size of buffer for security descriptor 
 LPDWORD lpnLengthNeeded                    // address of required size of buffer
);

The API reference is necessarily vague on what a SECURITY_DESCRIPTOR is, but you can call a bunch of other functions using its address as a parameter to get specific properties. The SECURITY_INFORMATION is just a DWORD constant specifying which of these functions you plan to call. You can find more info at http://msdn.microsoft.com/en-us/library/aa446641%28VS.85%29.aspx

Edit - the second code section keeps coming out looking screwy, but the link to the API reference will lead you where you need to go if you dig around a bit.

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