win32 1.4.0-dev.1

A Dart library for accessing common Win32 APIs using FFI. No C required!

example/main.dart

// main.dart

// Trivial example showing Win32 common dialog box invocation.

// More sophisticated examples can be found in the `example\` subdirectory
// of the package.

import 'dart:ffi';

import 'package:ffi/ffi.dart';
import 'package:win32/win32.dart';

// Convert from Win32 0x00BBGGRR color layout to a user-friendly string
String toHexColor(int color) =>
    '0x' +
    GetRValue(color).toRadixString(16).padLeft(2, '0') +
    GetGValue(color).toRadixString(16).padLeft(2, '0') +
    GetBValue(color).toRadixString(16).padLeft(2, '0');

void main() {
  // Allocates memory on the native heap for the struct that will be used to
  // configure the dialog box and return values
  final cc = CHOOSECOLOR.allocate();

  // Default color is mid-gray
  cc.rgbResult = RGB(0x80, 0x80, 0x80);

  // Set custom colors to a palette of blues and purples
  // elementAt(x).value dereferences the pointer at addr+x
  for (var i = 0; i < 16; i++) {
    cc.lpCustColors.elementAt(i).value = RGB(i * 16, 0x80, 0xFF);
  }

  // Set dialog flags:
  //   CC_RGBINIT: use rgbResult for the dialog default value
  //   CC_FULLOPEN: automatically open custom colors section of dialog
  cc.Flags = CC_RGBINIT | CC_FULLOPEN;

  // Call the Win32 API to show dialog, passing pointer to the config struct
  ChooseColor(cc.addressOf);

  // Print the value returned from the dialog box
  print('Color chosen: ${toHexColor(cc.rgbResult)}');

  // Free the memory allocated on the native heap
  free(cc.addressOf);
}