Dart _psapi not found - dart

Question

I am trying to call WinAPI. I have copy-past code from docs:
import 'dart:ffi';
import 'package:ffi/ffi.dart';
import 'package:win32/win32.dart';
main() {
int EnumProcesses(
Pointer<Uint32> lpidProcess, int cb, Pointer<Uint32> lpcbNeeded) {
final _EnumProcesses = _psapi.lookupFunction<
Int32 Function(
Pointer<Uint32> lpidProcess, Uint32 cb, Pointer<Uint32> lpcbNeeded),
int Function(Pointer<Uint32> lpidProcess, int cb,
Pointer<Uint32> lpcbNeeded)>('EnumProcesses');
return _EnumProcesses(lpidProcess, cb, lpcbNeeded);
}
}

Answer 1

If you've got a reference to win32, you don't need to copy this code also -- you should already have the EnumProcesses API available to you.
Here's a simple example of how to use it:
import 'dart:ffi';
import 'dart:io';
import 'package:ffi/ffi.dart';
import 'package:win32/win32.dart';
int printModules(int processID) {
// Print the process identifier.
print('\nProcess ID: $processID');
// Get a handle to the process.
final hProcess = OpenProcess(
PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processID);
if (hProcess == 0) {
return 1;
}
// Get a list of all the modules in this process.
final hMods = allocate<IntPtr>(count: 1024);
final cbNeeded = allocate<Uint32>();
if (EnumProcessModules(
hProcess, hMods, sizeOf<IntPtr>() * 1024, cbNeeded.cast()) ==
1) {
for (var i = 0; i < ((cbNeeded.value / sizeOf<IntPtr>()).floor()); i++) {
final szModName = allocate<Uint16>(count: MAX_PATH).cast<Utf16>();
// Get the full path to the module's file.
final hModule = hMods.elementAt(i).value;
final moduleValue =
'0x${hModule.toRadixString(16).padLeft(sizeOf<IntPtr>(), '0').toUpperCase()}';
if (GetModuleFileNameEx(hProcess, hModule, szModName, MAX_PATH) != 0) {
// Print the module name and handle value.
print('\t${szModName.unpackString(MAX_PATH)} ($moduleValue)');
}
free(szModName);
}
}
free(hMods);
free(cbNeeded);
// Release the handle to the process.
CloseHandle(hProcess);
return 0;
}
void main() {
final aProcesses = allocate<Uint32>(count: 1024);
final cbNeeded = allocate<Uint32>();
// Get the list of process identifiers.
if (EnumProcesses(aProcesses, sizeOf<Uint32>() * 1024, cbNeeded.cast()) ==
0) {
print('EnumProcesses failed.');
exit(1);
}
// Calculate how many process identifiers were returned.
final cProcesses = (cbNeeded.value / sizeOf<Uint32>()).floor();
// Print the names of the modules for each process.
for (var i = 0; i < cProcesses; i++) {
printModules(aProcesses[i]);
}
}