How does QT get the ico of a process - qt

Question

I want to make a process list window, so I traverse the process list, but I don’t know how to get the icon and display it in the listWidget
This is my code:
#include <windows.h>
#include <psapi.h>
#include <tlhelp32.h>
#include <iostream>
HANDLE hSnap = CreateToolhelp32Snapshot(PROCESS_ALL_ACCESS, 0);
if( hSnap != INVALID_HANDLE_VALUE )
{
PROCESSENTRY32 pe;
pe.dwSize = sizeof(pe);
if( Process32First(hSnap, &pe) )
{
DWORD curID = GetCurrentThreadId();
do{
if(pe.th32ProcessID && pe.th32ProcessID != curID)
{
QListWidgetItem *it = new QListWidgetItem(
/* icon */
PaddingZero(QString::number(pe.th32ProcessID, 16)).toUpper() +"-"+ QString::fromWCharArray(pe.szExeFile),
ui->listWidget
);
ui->listWidget->addItem(it);
//printf("name: %ls, id: %d\n",pe.szExeFile,pe.th32ProcessID);
}
}while( Process32Next(hSnap, &pe) );
}
}
CloseHandle(hSnap);
How can I get the ico of each process.

Answer 1

After a few days, I finally found the answer
HANDLE hSnap = CreateToolhelp32Snapshot(PROCESS_ALL_ACCESS, 0);
if( hSnap != INVALID_HANDLE_VALUE )
{
PROCESSENTRY32 pe;
pe.dwSize = sizeof(pe);
if( Process32First(hSnap, &pe) )
{
do{
if(pe.th32ProcessID != GetCurrentProcessId())
{
// https://forum.qt.io/topic/62866/getting-icon-from-external-applications/5
// https://stackoverflow.com/questions/63653786/error-using-getmodulefilenameexa-function-in-qt?noredirect=1#comment112561229_63653786
HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pe.th32ProcessID);
wchar_t lpFilename[1024];
GetModuleFileNameExW(hProcess, NULL, lpFilename, sizeof(lpFilename));
CloseHandle(hProcess);
QFileInfo fin( QString::fromWCharArray(lpFilename) );
QFileSystemModel *model = new QFileSystemModel;
model->setRootPath(fin.path());
QIcon ic = model->fileIcon(model->index(fin.filePath()));
QListWidgetItem *it = new QListWidgetItem(
ic,
PaddingZero(QString::number(pe.th32ProcessID, 16)).toUpper() +
"-" +
QString::fromWCharArray(pe.szExeFile),
ui->list
);
ui->list->addItem(it);
//printf("name: %ls, id: %d\n",pe.szExeFile,pe.th32ProcessID);
}
}while( Process32Next(hSnap, &pe) );
}
}
CloseHandle(hSnap);