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分享在VB 中 调用 Win32 API 函数 FileTimeToDosDateTime 的问题
该函数的在Win32 SDK中的声明方法为：
BOOL FileTimeToDosDateTime(
CONST FILETIME *lpFileTime,
// pointer to 64-bit file time
LPWORD lpFatDate, // pointer to variable for MS-DOS date
LPWORD lpFatTime // pointer to variable for MS-DOS time
);
请问怎么在VB中定义与LPWORD类型兼容的数据类型？
BOOL FileTimeToDosDateTime(
CONST FILETIME *lpFileTime,
// pointer to 64-bit file time
LPWORD lpFatDate, // pointer to variable for MS-DOS date
LPWORD lpFatTime // pointer to variable for MS-DOS time
);
请问怎么在VB中定义与LPWORD类型兼容的数据类型？
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天拉噜 2003-07-02
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这两种类型我都用过，但是执行到这里时，出现应用程序错误提示框："0x77e6eee4"指令引用的"0x00000000"的内存。该内存不能为"written"。
hiker_lx 2003-07-02
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LPWORD对应Integer类型
天拉噜 2003-07-02
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Long不行啊，我试过执行到这里就出错了。
lwm1977 2003-07-02
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long试试
天拉噜 2003-07-02
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我还是把我的源码贴出来，大家帮我诊断一下吧
Private Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type
Private Type WIN32_FIND_DATA
dwFileAttributes As Long
ftCreationTime As FILETIME
ftLastAccessTime As FILETIME
ftLastWriteTime As FILETIME
nFileSizeHigh As Long
nFileSizeLow As Long
dwReserved0 As Long
dwReserved1 As Long
cFileName As String * 260
cAlternate As String * 14
End Type
Private Declare Function FileTimeToLocalFileTime Lib "Kernel32" (lpFileTime As FILETIME, lpLocalFileTime As FILETIME) As Long
Private Declare Function FindFirstFile Lib "Kernel32" Alias "FindFirstFileA" (ByVal lpFileName As String, lpFindFileData As WIN32_FIND_DATA) As Long
Private Declare Function FindClose Lib "Kernel32" (ByVal hFindFile As Long) As Long
Private Declare Function FileTimeToDosDateTime Lib "Kernel32" (lpFileTime As FILETIME, ByVal lpFatDate As Long, ByVal lpFatTime As Long) As Long
Function FileExists(FileName As String) As Boolean
FileExists = FileAge(FileName) <> -1
End Function
Function FileAge(FileName As String) As Long
Dim Handle As Long
Dim FindData As WIN32_FIND_DATA
Dim LocalFileTime As FILETIME
Handle = FindFirstFile(FileName, FindData)
If Handle <> -1 Then
FindClose (Handle)
If (FindData.dwFileAttributes And File_Attribute_Directory) = 0 Then
Call FileTimeToLocalFileTime(FindData.ftLastWriteTime, LocalFileTime)
'执行到下一句就出现了上面的错误
If FileTimeToDosDateTime(LocalFileTime, FileAge, FileAge) Then
Exit Function
End If
End If
End If
FileAge = -1
End Function
Private Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type
Private Type WIN32_FIND_DATA
dwFileAttributes As Long
ftCreationTime As FILETIME
ftLastAccessTime As FILETIME
ftLastWriteTime As FILETIME
nFileSizeHigh As Long
nFileSizeLow As Long
dwReserved0 As Long
dwReserved1 As Long
cFileName As String * 260
cAlternate As String * 14
End Type
Private Declare Function FileTimeToLocalFileTime Lib "Kernel32" (lpFileTime As FILETIME, lpLocalFileTime As FILETIME) As Long
Private Declare Function FindFirstFile Lib "Kernel32" Alias "FindFirstFileA" (ByVal lpFileName As String, lpFindFileData As WIN32_FIND_DATA) As Long
Private Declare Function FindClose Lib "Kernel32" (ByVal hFindFile As Long) As Long
Private Declare Function FileTimeToDosDateTime Lib "Kernel32" (lpFileTime As FILETIME, ByVal lpFatDate As Long, ByVal lpFatTime As Long) As Long
Function FileExists(FileName As String) As Boolean
FileExists = FileAge(FileName) <> -1
End Function
Function FileAge(FileName As String) As Long
Dim Handle As Long
Dim FindData As WIN32_FIND_DATA
Dim LocalFileTime As FILETIME
Handle = FindFirstFile(FileName, FindData)
If Handle <> -1 Then
FindClose (Handle)
If (FindData.dwFileAttributes And File_Attribute_Directory) = 0 Then
Call FileTimeToLocalFileTime(FindData.ftLastWriteTime, LocalFileTime)
'执行到下一句就出现了上面的错误
If FileTimeToDosDateTime(LocalFileTime, FileAge, FileAge) Then
Exit Function
End If
End If
End If
FileAge = -1
End Function
刘洪峰AIoT 2003-07-02
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Private Declare Function FileTimeToDosDateTime Lib "kernel32" Alias "FileTimeToDosDateTime" (lpFileTime As FILETIME, ByVal lpFatDate As Long, ByVal lpFatTime As Long) As Long
