106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
#include <Windows.h>
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#include <iostream>
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#include <ctime>
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#include <fstream>
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#include <sstream>
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std::wstring last_error()
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{
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const DWORD error_code = GetLastError();
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wchar_t* error_msg;
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FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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nullptr,
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error_code,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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reinterpret_cast<LPWSTR>(&error_msg),
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0,
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nullptr);
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std::wstring result{ error_msg };
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LocalFree(error_msg);
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return result;
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}
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int report(std::wostream& os)
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{
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auto callback = [](HMONITOR monitor, HDC, RECT*, LPARAM prm) -> BOOL {
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std::wostream& os = *(std::wostream*)prm;
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MONITORINFOEX mi;
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mi.cbSize = sizeof(mi);
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if (GetMonitorInfo(monitor, &mi))
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{
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os << "GetMonitorInfo OK\n";
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DISPLAY_DEVICE displayDevice = { sizeof(displayDevice) };
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if (EnumDisplayDevices(mi.szDevice, 0, &displayDevice, 1))
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{
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if (displayDevice.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER)
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{
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os << "EnumDisplayDevices OK[MIRRORING_DRIVER]: \n"
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<< "\tDeviceID = " << displayDevice.DeviceID << '\n'
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<< "\tDeviceKey = " << displayDevice.DeviceKey << '\n'
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<< "\tDeviceName = " << displayDevice.DeviceName << '\n'
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<< "\tDeviceString = " << displayDevice.DeviceString << '\n';
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}
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else
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{
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os << "EnumDisplayDevices OK:\n"
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<< "\tDeviceID = " << displayDevice.DeviceID << '\n'
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<< "\tDeviceKey = " << displayDevice.DeviceKey << '\n'
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<< "\tDeviceName = " << displayDevice.DeviceName << '\n'
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<< "\tDeviceString = " << displayDevice.DeviceString << '\n';
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}
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}
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else
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{
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os << "EnumDisplayDevices FAILED: " << last_error() << '\n';
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}
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}
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else
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{
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os << "GetMonitorInfo FAILED: " << last_error() << '\n';
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}
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return TRUE;
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};
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if (EnumDisplayMonitors(nullptr, nullptr, callback, (LPARAM)&os))
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{
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os << "EnumDisplayMonitors OK\n";
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}
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else
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{
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os << "EnumDisplayMonitors FAILED: " << last_error() << '\n';
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}
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return 0;
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}
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int main()
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{
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time_t rawtime;
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struct tm* timeinfo;
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char buffer[1024];
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time(&rawtime);
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timeinfo = localtime(&rawtime);
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strftime(buffer, sizeof(buffer), "monitor-info-report-%d-%m-%Y-%H-%M-%S.txt", timeinfo);
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std::string str(buffer);
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std::wofstream of{ str };
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std::wostringstream oss;
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try
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{
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oss << "GetSystemMetrics = " << GetSystemMetrics(SM_CMONITORS) << '\n';
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report(oss);
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}
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catch (std::exception& ex)
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{
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oss << "exception: " << ex.what() << '\n';
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}
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catch (...)
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{
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oss << "unknown exception: " << last_error() << '\n';
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}
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of << oss.str();
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std::wcout << oss.str() << '\n';
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return 0;
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} |