Add MileDeleteFileIgnoreReadonlyAttributeByHandle function.

Mile.Helpers/Mile.Helpers.Base.cpp

@@ -869,3 +869,35 @@ EXTERN_C BOOL WINAPI MileDeleteFileByHandle(
         &DispostionInfoEx,
         sizeof(FILE_DISPOSITION_INFO_EX));
 }
+
+EXTERN_C BOOL WINAPI MileDeleteFileIgnoreReadonlyAttributeByHandle(
+    _In_ HANDLE FileHandle)
+{
+    BOOL Result = FALSE;
+
+    DWORD OldAttribute = 0;
+    // Save old attributes.
+    if (::MileGetFileAttributesByHandle(FileHandle, &OldAttribute))
+    {
+        // Get hardlink count.
+        DWORD HardlinkCount = 0;
+        if (::MileGetFileHardlinkCountByHandle(FileHandle, &HardlinkCount))
+        {
+            // Remove readonly attribute.
+            if (::MileSetFileAttributesByHandle(
+                FileHandle,
+                OldAttribute & (-1 ^ FILE_ATTRIBUTE_READONLY)))
+            {
+                // Delete the file.
+                Result = ::MileDeleteFileByHandle(FileHandle);
+                if (!Result || HardlinkCount > 1)
+                {
+                    // Restore attributes if failed or had another hard links.
+                    ::MileSetFileAttributesByHandle(FileHandle, OldAttribute);
+                }
+            }
+        }
+    }
+
+    return Result;
+}

Mile.Helpers/Mile.Helpers.Base.h

@@ -346,4 +346,16 @@ EXTERN_C BOOL WINAPI MileGetFileHardlinkCountByHandle(
 EXTERN_C BOOL WINAPI MileDeleteFileByHandle(
     _In_ HANDLE FileHandle);
 
+/**
+ * @brief Deletes an existing file, even the file have the readonly attribute.
+ * @param FileHandle The handle of the file to be deleted. This handle must be
+ *                   opened with the appropriate permissions for the requested
+ *                   change. This handle should not be a pipe handle.
+ * @return If the function succeeds, the return value is nonzero. If the
+ *         function fails, the return value is zero. To get extended error
+ *         information, call GetLastError.
+*/
+EXTERN_C BOOL WINAPI MileDeleteFileIgnoreReadonlyAttributeByHandle(
+    _In_ HANDLE FileHandle);
+
 #endif // !MILE_WINDOWS_HELPERS_BASE

ReleaseNotes.md

@@ -50,3 +50,4 @@
 - Add MileSetFileAttributesByHandle function.
 - Add MileGetFileHardlinkCountByHandle function.
 - Add MileDeleteFileByHandle function.
+- Add MileDeleteFileIgnoreReadonlyAttributeByHandle function.