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/*
* IPCWindow.cpp
* -------------
* Purpose: Hidden window to receive file open commands from another OpenMPT instance
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "IPCWindow.h"
#include "../common/version.h"
#include "Mptrack.h"
OPENMPT_NAMESPACE_BEGIN
namespace IPCWindow
{
static constexpr TCHAR ClassName[] = _T("OpenMPT_IPC_Wnd");
static HWND ipcWindow = nullptr;
static LRESULT CALLBACK IPCWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
if(uMsg == WM_COPYDATA)
{
const auto ©Data = *reinterpret_cast<const COPYDATASTRUCT *>(lParam);
LRESULT result = 0;
switch(static_cast<Function>(copyData.dwData))
{
case Function::Open:
{
std::size_t count = copyData.cbData / sizeof(WCHAR);
const WCHAR* data = static_cast<const WCHAR *>(copyData.lpData);
const std::wstring name = std::wstring(data, data + count);
result = theApp.OpenDocumentFile(mpt::PathString::FromWide(name).AsNative().c_str()) ? 1 : 2;
}
break;
case Function::SetWindowForeground:
{
auto mainWnd = theApp.GetMainWnd();
if(mainWnd)
{
if(mainWnd->IsIconic())
{
mainWnd->ShowWindow(SW_RESTORE);
}
mainWnd->SetForegroundWindow();
result = 1;
} else
{
result = 0;
}
}
break;
case Function::GetVersion:
{
result = Version::Current().GetRawVersion();
}
break;
case Function::GetArchitecture:
{
#if MPT_OS_WINDOWS
result = static_cast<int32>(mpt::OS::Windows::GetProcessArchitecture());
#else
result = -1;
#endif
}
break;
case Function::HasSameBinaryPath:
{
std::size_t count = copyData.cbData / sizeof(WCHAR);
const WCHAR* data = static_cast<const WCHAR *>(copyData.lpData);
const std::wstring path = std::wstring(data, data + count);
result = (theApp.GetInstallBinArchPath().ToWide() == path) ? 1 : 0;
}
break;
case Function::HasSameSettingsPath:
{
std::size_t count = copyData.cbData / sizeof(WCHAR);
const WCHAR* data = static_cast<const WCHAR *>(copyData.lpData);
const std::wstring path = std::wstring(data, data + count);
result = (theApp.GetConfigPath().ToWide() == path) ? 1 : 0;
}
break;
default:
result = 0;
break;
}
return result;
}
return ::DefWindowProc(hwnd, uMsg, wParam, lParam);
}
void Open(HINSTANCE hInstance)
{
WNDCLASS ipcWindowClass =
{
0,
IPCWindowProc,
0,
0,
hInstance,
nullptr,
nullptr,
nullptr,
nullptr,
ClassName
};
auto ipcAtom = RegisterClass(&ipcWindowClass);
ipcWindow = CreateWindow(MAKEINTATOM(ipcAtom), _T("OpenMPT IPC Window"), 0, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, 0);
}
void Close()
{
::DestroyWindow(ipcWindow);
ipcWindow = nullptr;
}
LRESULT SendIPC(HWND ipcWnd, Function function, mpt::const_byte_span data)
{
if(!ipcWnd)
{
return 0;
}
if(!mpt::in_range<DWORD>(data.size()))
{
return 0;
}
COPYDATASTRUCT copyData{};
copyData.dwData = static_cast<ULONG>(function);
copyData.cbData = mpt::saturate_cast<DWORD>(data.size());
copyData.lpData = const_cast<void*>(mpt::void_cast<const void*>(data.data()));
return ::SendMessage(ipcWnd, WM_COPYDATA, 0, reinterpret_cast<LPARAM>(©Data));
}
HWND FindIPCWindow()
{
return ::FindWindow(ClassName, nullptr);
}
struct EnumWindowState
{
FlagSet<InstanceRequirements> require;
HWND result = nullptr;
};
static BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
EnumWindowState &state = *reinterpret_cast<EnumWindowState*>(lParam);
if(hwnd)
{
TCHAR className[256];
MemsetZero(className);
if(::GetClassName(hwnd, className, 256) > 0)
{
if(!_tcscmp(className, IPCWindow::ClassName))
{
if(state.require[SameVersion])
{
if(Version(static_cast<uint32>(SendIPC(hwnd, Function::GetVersion))) != Version::Current())
{
return TRUE; // continue
}
}
if(state.require[SameArchitecture])
{
if(SendIPC(hwnd, Function::GetArchitecture) != static_cast<int>(mpt::OS::Windows::GetProcessArchitecture()))
{
return TRUE; // continue
}
}
if(state.require[SamePath])
{
if(SendIPC(hwnd, Function::HasSameBinaryPath, mpt::as_span(theApp.GetInstallBinArchPath().ToWide())) != 1)
{
return TRUE; // continue
}
}
if(state.require[SameSettings])
{
if(SendIPC(hwnd, Function::HasSameSettingsPath, mpt::as_span(theApp.GetConfigPath().ToWide())) != 1)
{
return TRUE; // continue
}
}
state.result = hwnd;
return TRUE; // continue
//return FALSE; // done
}
}
}
return TRUE; // continue
}
HWND FindIPCWindow(FlagSet<InstanceRequirements> require)
{
EnumWindowState state;
state.require = require;
if(::EnumWindows(&EnumWindowsProc, reinterpret_cast<LPARAM>(&state)) == 0)
{
return nullptr;
}
return state.result;
}
bool SendToIPC(const std::vector<mpt::PathString> &filenames)
{
HWND ipcWnd = FindIPCWindow();
if(!ipcWnd)
{
return false;
}
DWORD processID = 0;
GetWindowThreadProcessId(ipcWnd, &processID);
AllowSetForegroundWindow(processID);
SendIPC(ipcWnd, Function::SetWindowForeground);
for(const auto &filename : filenames)
{
if(SendIPC(ipcWnd, Function::Open, mpt::as_span(filename.ToWide())) == 0)
{
return false;
}
}
return true;
}
}
OPENMPT_NAMESPACE_END
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