当用CreateFile时返回的文件句柄为0xFFFFFFFF是什么意思?它代表几种可能的错误组合?

[lambo]

当用CreateFile时返回的文件句柄为0xFFFFFFFF是什么意思?它代表几种可能的错误组合?

[yes_start]

表示CreateFile失败

[lambo]

那它返回0即NULL又是怎么回事呢?

[rivershan]

GetLastError看看呢？
返回0时表示成功~

[rivershan]

非0失败~

[rivershan]

HANDLE CreateFile(
LPCTSTR lpFileName, // file name
DWORD dwDesiredAccess, // access mode
DWORD dwShareMode, // share mode
LPSECURITY_ATTRIBUTES lpSecurityAttributes, // SD
DWORD dwCreationDisposition, // how to create
DWORD dwFlagsAndAttributes, // file attributes
HANDLE hTemplateFile // handle to template file
);

Return Values
If the function succeeds, the return value is an open handle to the specified file. If the specified file exists before the function call and dwCreationDisposition is CREATE_ALWAYS or OPEN_ALWAYS, a call to GetLastError returns ERROR_ALREADY_EXISTS (even though the function has succeeded). If the file does not exist before the call, GetLastError returns zero.

If the function fails, the return value is INVALID_HANDLE_VALUE. To get extended error information, call GetLastError.

[lambo]

不会吧,我想你错了,返回0时肯定是失败的,返回非0时是成功的

[Richuen22]

If the function succeeds, the return value is an open handle to the specified file. If the specified file exists before the function call and dwCreationDisposition is CREATE_ALWAYS or OPEN_ALWAYS, a call to GetLastError returns ERROR_ALREADY_EXISTS (even though the function has succeeded). If the file does not exist before the call, GetLastError returns zero.

If the function fails, the return value is INVALID_HANDLE_VALUE. To get extended error information, call GetLastError.

[caigzhi]

INVALID_HANDLE_VALUE = 0xFFFFFFFF = -1;
CreateFile()最常见的错误返回值；
这是这个API和其他不同之处，熟悉File（或IO操作）操作都应该了解。

[clife]

0xFFFFFFFF是NULL,内存中没有句柄