Initial commit

TestFileSizeZero2.py

@@ -0,0 +1,41 @@
+import os
+import ctypes as ct
+import ctypes.wintypes as w
+
+NO_ERROR = 0
+
+INVALID_FILE_SIZE = w.DWORD(0xFFFFFFFF).value
+INVALID_FILE_ATTRIBUTES = w.DWORD(-1).value
+
+FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS = 0x00400000
+
+# Helpers to raise exceptions on API failures.
+
+def filesizecheck(result, func, args):
+    if result == INVALID_FILE_SIZE and (err := ct.get_last_error()) != NO_ERROR:
+        raise ct.WinError(err)
+    return result
+
+def attributecheck(result, func, args):
+    if result == INVALID_FILE_ATTRIBUTES:
+        raise ct.WinError(ct.get_last_error())
+    return result
+
+kernel32 = ct.WinDLL('kernel32', use_last_error=True)
+GetCompressedFileSize = kernel32.GetCompressedFileSizeW
+GetCompressedFileSize.argtypes = w.LPCWSTR, w.LPDWORD
+GetCompressedFileSize.restype = w.DWORD
+GetCompressedFileSize.errcheck = filesizecheck
+GetFileAttributes = kernel32.GetFileAttributesW
+GetFileAttributes.argtypes = w.LPCWSTR,
+GetFileAttributes.restype = w.DWORD
+GetFileAttributes.errcheck = attributecheck
+
+fullpath=r"u:\D1\Days\Stefajir\user\default.htm"
+local_size = GetCompressedFileSize(fullpath, None)
+attributes = GetFileAttributes(fullpath)
+print(local_size)
+print(attributes)
+print(FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS)
+if attributes & FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS and local_size != 0:
+    print(f'0x{attributes:08X} {local_size:6d} {fullpath}')