- 1 year ago
Flutter GetSystemMetricsForDpi not located
The GetSystemMetricsForDpi
function is not directly available in Flutter as it is a Win32 API provided by the Windows operating system. Flutter primarily focuses on cross-platform development and may not have direct bindings for all native platform-specific APIs.
To access GetSystemMetricsForDpi
or any other Win32 API function in a Flutter application, you can use the dart:ffi
package to create bindings to the native API. Here's an example of how you can use dart:ffi
to call GetSystemMetricsForDpi
:
Add the
ffi
package as a dependency in yourpubspec.yaml
file:yamldependencies:
ffi: ^1.0.0
Create a new Dart file (e.g.,
win32.dart
) where you define the bindings to the Win32 API:dartimport 'dart:ffi';
import 'package:ffi/ffi.dart';
final user32 = DynamicLibrary.open('user32.dll');
typedef GetSystemMetricsForDpiC = int Function(
int nIndex, int dpi);
typedef GetSystemMetricsForDpiDart = int Function(
int nIndex, int dpi);
final getSystemMetricsForDpi =
user32
.lookupFunction<GetSystemMetricsForDpiC, GetSystemMetricsForDpiDart>(
'GetSystemMetricsForDpi');
In your Flutter code, import the
win32.dart
file and use thegetSystemMetricsForDpi
function to callGetSystemMetricsForDpi
:dartimport 'win32.dart';
void main() {
// DPI-aware metrics
final smCxScreen = getSystemMetricsForDpi(0, 96);
final smCyScreen = getSystemMetricsForDpi(1, 96);
// Use the retrieved metrics
print('Screen Width: $smCxScreen');
print('Screen Height: $smCyScreen');
}
In this example, we define the necessary bindings for GetSystemMetricsForDpi
using the dart:ffi
package and then use those bindings to call the function.
Please note that this approach is specific to calling native Win32 APIs from Dart and Flutter. It is essential to consult the Windows API documentation for GetSystemMetricsForDpi
to understand the correct parameters, return types, and any additional considerations for using the function correctly.