Add extra shell file operation APIs

example/recycle_bin.dart

@@ -0,0 +1,92 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Explores the Windows Recycle Bin.
+
+// ignore_for_file: constant_identifier_names
+
+import 'dart:ffi';
+import 'dart:io';
+
+import 'package:ffi/ffi.dart';
+import 'package:win32/win32.dart';
+
+class RecycleBinInfo {
+  final int itemCount;
+  final int totalSizeInBytes;
+
+  const RecycleBinInfo(this.itemCount, this.totalSizeInBytes);
+}
+
+RecycleBinInfo queryRecycleBin(String rootPath) {
+  final pszRootPath = rootPath.toNativeUtf16();
+  final pSHQueryRBInfo = calloc<SHQUERYRBINFO>()
+    ..ref.cbSize = sizeOf<SHQUERYRBINFO>();
+
+  try {
+    final hr = SHQueryRecycleBin(pszRootPath, pSHQueryRBInfo);
+    if (hr != S_OK) throw WindowsException(hr);
+
+    return RecycleBinInfo(
+        pSHQueryRBInfo.ref.i64NumItems, pSHQueryRBInfo.ref.i64Size);
+  } finally {
+    free(pszRootPath);
+    free(pSHQueryRBInfo);
+  }
+}
+
+String getTempFileName() {
+  final lpPathName = '.'.toNativeUtf16();
+  final lpPrefixString = 'dart'.toNativeUtf16();
+  final lpTempFileName = wsalloc(MAX_PATH);
+
+  try {
+    final result =
+        GetTempFileName(lpPathName, lpPrefixString, 0, lpTempFileName);
+    if (result == 0) throw 'Unable to create filename';
+
+    return lpTempFileName.toDartString();
+  } finally {
+    free(lpPathName);
+    free(lpPrefixString);
+    free(lpTempFileName);
+  }
+}
+
+bool recycleFile(String file) {
+  final hwnd = GetActiveWindow();
+  final pFrom = [file].toWideCharArray();
+  final lpFileOp = calloc<SHFILEOPSTRUCT>()
+    ..ref.hwnd = hwnd
+    ..ref.wFunc = FO_DELETE
+    ..ref.pFrom = pFrom
+    ..ref.pTo = nullptr
+    ..ref.fFlags = FOF_ALLOWUNDO;
+
+  try {
+    final result = SHFileOperation(lpFileOp);
+    return result == 0;
+  } finally {
+    free(pFrom);
+    free(lpFileOp);
+  }
+}
+
+void main(List<String> args) {
+  final info = queryRecycleBin('c:\\');
+  print('There are ${info.itemCount} items in the '
+      'Recycle Bin on the C: drive.');
+
+  final tempFile = getTempFileName();
+  print('Creating temporary file $tempFile');
+  File(tempFile)
+      .writeAsStringSync('With time involved, everything is temporary.');
+
+  print('Sending temporary file $tempFile to the Recycle Bin.');
+  recycleFile(tempFile);
+
+  final newInfo = queryRecycleBin('c:\\');
+  print('There now are ${newInfo.itemCount} items in the '
+      'Recycle Bin on the C: drive.');
+}

lib/src/constants.dart

@@ -7637,6 +7637,83 @@ const SHUTDOWN_RESTARTAPPS = 0x0000080;
 /// options for the shutdown.
 const SHUTDOWN_HYBRID = 0x0000200;
 
+// -----------------------------------------------------------------------------
+// Shell File operation constants
+// -----------------------------------------------------------------------------
+
+/// Move the files specified in pFrom to the location specified in pTo.
+const FO_MOVE = 0x0001;
+
+/// Copy the files specified in the pFrom member to the location specified in
+/// the pTo member.
+const FO_COPY = 0x0002;
+
+/// Delete the files specified in pFrom.
+const FO_DELETE = 0x0003;
+
+/// Rename the file specified in pFrom. You cannot use this flag to rename
+/// multiple files with a single function call. Use FO_MOVE instead.
+const FO_RENAME = 0x0004;
+
+/// The pTo member specifies multiple destination files (one for each source
+/// file in pFrom) rather than one directory where all source files are to be
+/// deposited.
+const FOF_MULTIDESTFILES = 0x0001;
+
+/// Do not display a progress dialog box.
+const FOF_SILENT = 0x0004;
+
+/// Give the file being operated on a new name in a move, copy, or rename
+/// operation if a file with the target name already exists at the destination.
+const FOF_RENAMEONCOLLISION = 0x0008;
+
+/// Respond with Yes to All for any dialog box that is displayed.
+const FOF_NOCONFIRMATION = 0x0010;
+
+/// If FOF_RENAMEONCOLLISION is specified and any files were renamed, assign a
+/// name mapping object that contains their old and new names to the
+/// hNameMappings member. This object must be freed using SHFreeNameMappings
+/// when it is no longer needed.
+const FOF_WANTMAPPINGHANDLE = 0x0020;
+
+/// Preserve undo information, if possible.
+const FOF_ALLOWUNDO = 0x0040;
+
+/// Perform the operation only on files (not on folders) if a wildcard file name
+/// (.) is specified.
+const FOF_FILESONLY = 0x0080;
+
+/// Display a progress dialog box but do not show individual file names as they
+/// are operated on.
+const FOF_SIMPLEPROGRESS = 0x0100;
+
+/// Do not ask the user to confirm the creation of a new directory if the
+/// operation requires one to be created.
+const FOF_NOCONFIRMMKDIR = 0x0200;
+
+/// Do not display a dialog to the user if an error occurs.
+const FOF_NOERRORUI = 0x0400;
+
+/// Do not copy the security attributes of the file. The destination file
+/// receives the security attributes of its new folder.
+const FOF_NOCOPYSECURITYATTRIBS = 0x0800;
+
+/// Only perform the operation in the local directory. Do not operate
+/// recursively into subdirectories, which is the default behavior.
+const FOF_NORECURSION = 0x1000;
+
+/// Do not move connected files as a group. Only move the specified files.
+const FOF_NO_CONNECTED_ELEMENTS = 0x2000;
+
+/// Send a warning if a file is being permanently destroyed during a delete
+/// operation rather than recycled. This flag partially overrides
+/// FOF_NOCONFIRMATION.
+const FOF_WANTNUKEWARNING = 0x4000;
+
+/// Perform the operation silently, presenting no UI to the user.
+const FOF_NO_UI =
+    FOF_SILENT | FOF_NOCONFIRMATION | FOF_NOERRORUI | FOF_NOCONFIRMMKDIR;
+
 // -----------------------------------------------------------------------------
 // Shell_NotifyIcon uFlags constants
 // -----------------------------------------------------------------------------

lib/src/structs.g.dart

@@ -7298,6 +7298,84 @@ class SHELL_ITEM_RESOURCE extends Struct {
   }
 }
 
+/// Contains information about a file object.
+///
+/// {@category Struct}
+class SHFILEINFO extends Struct {
+  @IntPtr()
+  external int hIcon;
+
+  @Int32()
+  external int iIcon;
+
+  @Uint32()
+  external int dwAttributes;
+
+  @Array(260)
+  external Array<Uint16> _szDisplayName;
+
+  String get szDisplayName {
+    final charCodes = <int>[];
+    for (var i = 0; i < 260; i++) {
+      if (_szDisplayName[i] == 0x00) break;
+      charCodes.add(_szDisplayName[i]);
+    }
+    return String.fromCharCodes(charCodes);
+  }
+
+  set szDisplayName(String value) {
+    final stringToStore = value.padRight(260, '\x00');
+    for (var i = 0; i < 260; i++) {
+      _szDisplayName[i] = stringToStore.codeUnitAt(i);
+    }
+  }
+
+  @Array(80)
+  external Array<Uint16> _szTypeName;
+
+  String get szTypeName {
+    final charCodes = <int>[];
+    for (var i = 0; i < 80; i++) {
+      if (_szTypeName[i] == 0x00) break;
+      charCodes.add(_szTypeName[i]);
+    }
+    return String.fromCharCodes(charCodes);
+  }
+
+  set szTypeName(String value) {
+    final stringToStore = value.padRight(80, '\x00');
+    for (var i = 0; i < 80; i++) {
+      _szTypeName[i] = stringToStore.codeUnitAt(i);
+    }
+  }
+}
+
+/// Contains information that the SHFileOperation function uses to perform
+/// file operations.
+///
+/// {@category Struct}
+class SHFILEOPSTRUCT extends Struct {
+  @IntPtr()
+  external int hwnd;
+
+  @Uint32()
+  external int wFunc;
+
+  external Pointer<Utf16> pFrom;
+
+  external Pointer<Utf16> pTo;
+
+  @Uint16()
+  external int fFlags;
+
+  @Int32()
+  external int fAnyOperationsAborted;
+
+  external Pointer hNameMappings;
+
+  external Pointer<Utf16> lpszProgressTitle;
+}
+
 /// Defines an item identifier.
 ///
 /// {@category Struct}

lib/src/win32/shell32.g.dart

@@ -216,6 +216,37 @@ final _SHEmptyRecycleBin = _shell32.lookupFunction<
     int Function(int hwnd, Pointer<Utf16> pszRootPath,
         int dwFlags)>('SHEmptyRecycleBinW');
 
+/// Copies, moves, renames, or deletes a file system object.
+///
+/// ```c
+/// int SHFileOperationW(
+///   LPSHFILEOPSTRUCTW lpFileOp
+/// );
+/// ```
+/// {@category shell32}
+int SHFileOperation(Pointer<SHFILEOPSTRUCT> lpFileOp) =>
+    _SHFileOperation(lpFileOp);
+
+final _SHFileOperation = _shell32.lookupFunction<
+    Int32 Function(Pointer<SHFILEOPSTRUCT> lpFileOp),
+    int Function(Pointer<SHFILEOPSTRUCT> lpFileOp)>('SHFileOperationW');
+
+/// Frees a file name mapping object that was retrieved by the
+/// SHFileOperation function.
+///
+/// ```c
+/// void SHFreeNameMappings(
+///   HANDLE hNameMappings
+/// );
+/// ```
+/// {@category shell32}
+void SHFreeNameMappings(int hNameMappings) =>
+    _SHFreeNameMappings(hNameMappings);
+
+final _SHFreeNameMappings = _shell32.lookupFunction<
+    Void Function(IntPtr hNameMappings),
+    void Function(int hNameMappings)>('SHFreeNameMappings');
+
 /// Retrieves the IShellFolder interface for the desktop folder, which is
 /// the root of the Shell's namespace.
 ///
@@ -280,6 +311,33 @@ final _SHGetDriveMedia = _shell32.lookupFunction<
     int Function(Pointer<Utf16> pszDrive,
         Pointer<Uint32> pdwMediaContent)>('SHGetDriveMedia');
 
+/// Retrieves information about an object in the file system, such as a
+/// file, folder, directory, or drive root.
+///
+/// ```c
+/// DWORD_PTR SHGetFileInfoW(
+///   LPCWSTR     pszPath,
+///   DWORD       dwFileAttributes,
+///   SHFILEINFOW *psfi,
+///   UINT        cbFileInfo,
+///   UINT        uFlags
+/// );
+/// ```
+/// {@category shell32}
+int SHGetFileInfo(Pointer<Utf16> pszPath, int dwFileAttributes,
+        Pointer<SHFILEINFO> psfi, int cbFileInfo, int uFlags) =>
+    _SHGetFileInfo(pszPath, dwFileAttributes, psfi, cbFileInfo, uFlags);
+
+final _SHGetFileInfo = _shell32.lookupFunction<
+    IntPtr Function(Pointer<Utf16> pszPath, Uint32 dwFileAttributes,
+        Pointer<SHFILEINFO> psfi, Uint32 cbFileInfo, Int32 uFlags),
+    int Function(
+        Pointer<Utf16> pszPath,
+        int dwFileAttributes,
+        Pointer<SHFILEINFO> psfi,
+        int cbFileInfo,
+        int uFlags)>('SHGetFileInfoW');
+
 /// Gets the path of a folder identified by a CSIDL value.
 ///
 /// ```c

test/api_test.dart

@@ -9842,6 +9842,20 @@ void main() {
               int dwFlags)>('SHEmptyRecycleBinW');
       expect(SHEmptyRecycleBin, isA<Function>());
     });
+    test('Can instantiate SHFileOperation', () {
+      final shell32 = DynamicLibrary.open('shell32.dll');
+      final SHFileOperation = shell32.lookupFunction<
+          Int32 Function(Pointer<SHFILEOPSTRUCT> lpFileOp),
+          int Function(Pointer<SHFILEOPSTRUCT> lpFileOp)>('SHFileOperationW');
+      expect(SHFileOperation, isA<Function>());
+    });
+    test('Can instantiate SHFreeNameMappings', () {
+      final shell32 = DynamicLibrary.open('shell32.dll');
+      final SHFreeNameMappings = shell32.lookupFunction<
+          Void Function(IntPtr hNameMappings),
+          void Function(int hNameMappings)>('SHFreeNameMappings');
+      expect(SHFreeNameMappings, isA<Function>());
+    });
     test('Can instantiate SHGetDesktopFolder', () {
       final shell32 = DynamicLibrary.open('shell32.dll');
       final SHGetDesktopFolder = shell32.lookupFunction<
@@ -9875,6 +9889,19 @@ void main() {
               Pointer<Uint32> pdwMediaContent)>('SHGetDriveMedia');
       expect(SHGetDriveMedia, isA<Function>());
     });
+    test('Can instantiate SHGetFileInfo', () {
+      final shell32 = DynamicLibrary.open('shell32.dll');
+      final SHGetFileInfo = shell32.lookupFunction<
+          IntPtr Function(Pointer<Utf16> pszPath, Uint32 dwFileAttributes,
+              Pointer<SHFILEINFO> psfi, Uint32 cbFileInfo, Int32 uFlags),
+          int Function(
+              Pointer<Utf16> pszPath,
+              int dwFileAttributes,
+              Pointer<SHFILEINFO> psfi,
+              int cbFileInfo,
+              int uFlags)>('SHGetFileInfoW');
+      expect(SHGetFileInfo, isA<Function>());
+    });
     test('Can instantiate SHGetFolderPath', () {
       final shell32 = DynamicLibrary.open('shell32.dll');
       final SHGetFolderPath = shell32.lookupFunction<

tool/generate.cmd

@@ -17,7 +17,9 @@ call dart test
 echo Running generated file tests...
 cd ..\..
 rem Now should be in win32
-call dart test
+
+rem Single threaded increases chances of detecting a segfault test failure
+call dart test --concurrency=1 --test-randomize-ordering-seed=random
 
 goto end