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GetCompressedFileSize The GetCompressedFileSize function obtains the actual number of bytes of disk storage used to store a specified file. If the file is located on a volume that supports compression, and the file is compressed, the value obtained is the compressed size of the specified file. If the file is not located on a volume that supports compression, or if the file is not compressed, the value obtained is the actual file size, the same as the value returned by a call to GetFileSize.
VB4-32,5,6
Declare Function GetCompressedFileSize Lib "kernel32" Alias "GetCompressedFileSizeA" (ByVal lpFileName As String, lpFileSizeHigh As Long) As Long |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 98 or later |
- lpFileName
Pointer to a null-terminated string that specifies the name of the file.
- lpFileSizeHigh
Pointer to a DWORD variable that the function sets to the high-order doubleword of the compressed file size. The function’s return value is the low-order doubleword of the compressed file size.
This parameter can be NULL if the high-order doubleword of the compressed file size is not needed. Files less than 4 gigabytes in size do not need the high-order doubleword. |
If the function succeeds, the return value is the low-order doubleword of the actual number of bytes of disk storage used to store the specified file, and if lpFileSizeHigh is non-NULL, the function puts the high-order doubleword of that actual value into the DWORD pointed to by that parameter. This is the compressed file size for compressed files, the actual file size for noncompressed files.
If the function fails, and lpFileSizeHigh is NULL, the return value is 0xFFFFFFFF. To get extended error information, call GetLastError.
If the function fails, and lpFileSizeHigh is non-NULL, the return value is 0xFFFFFFFF, and GetLastError returns a value other than NO_ERROR. |
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