processimpl.cpp

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/* SPDX-License-Identifier: MIT */
#include "ajabase/system/windows/processimpl.h"
#include "ajabase/common/timer.h"
 
 
// class AJAProcessImpl
 
AJAProcessImpl::AJAProcessImpl()
{
}
 
 
AJAProcessImpl::~AJAProcessImpl()
{
}
 
uint64_t
AJAProcessImpl::GetPid()
{
    return GetCurrentProcessId();
}
 
bool
AJAProcessImpl::IsValid(uint64_t pid)
{
    HANDLE pH = OpenProcess(SYNCHRONIZE, false, (DWORD)pid);
    if(INVALID_HANDLE_VALUE != pH && NULL != pH)
    {
        DWORD retValue = WaitForSingleObject(pH, 0);
        CloseHandle(pH);
        return retValue == WAIT_TIMEOUT;
    }
    return false;
}
 
static HWND hFoundWindow = NULL;
 
BOOL CALLBACK findFunc(HWND hWnd, LPARAM lParam)
{
    bool bDone = false;
    TCHAR* pTail = (TCHAR*)lParam;
    TCHAR Title[500];
    GetWindowText(hWnd, Title, NUMELMS(Title));
 
    if(strlen(Title) < strlen(pTail))
        return TRUE;
    TCHAR* pTitle = Title + strlen(Title) - strlen(pTail);
    if(pTitle < Title)
        return TRUE;        // Don't do the compare, because it would overflow
    int32_t len = min((int32_t)strlen(pTitle), (int32_t)strlen(pTail));
    if(!_strnicmp(pTitle, pTail, len))
    {
        hFoundWindow = hWnd;
        return FALSE;       // Found it, we're done
    }
    return TRUE;            // Keep going
}
 
 
bool
AJAProcessImpl::Activate(const char* pWindow)
{
    // handle "ends in" by looking for * at beginning of string
    const char* pName = pWindow;
    bool bEnum = false;
    if(*pName == '*')
    {
        pName++;
        bEnum = true;
    }
    HWND hWindow = NULL;
    bool bFound = false;
    if(!bEnum)
    {
        hWindow = FindWindow(NULL, pWindow);
        bFound = hWindow ? true : false;
    }
    else
    {
        hFoundWindow = NULL;
        bFound = !EnumWindows(findFunc, (LPARAM)pName);
        hWindow = hFoundWindow;
    }
    if(!bFound)
        return false;
 
    return Activate((uint64_t)hWindow);
}
 
bool
AJAProcessImpl::Activate(uint64_t handle)
{
    HWND hWnd = (HWND)handle;
    if(!hWnd)
        return false;
    if(!IsWindow(hWnd))
        return false;
 
    DWORD pid = 0;
    DWORD oldThread = GetWindowThreadProcessId(hWnd, &pid);
    if(!oldThread)
        return false;
 
    DWORD currentThread = GetCurrentThreadId();
 
    WINDOWPLACEMENT wp;
    wp.length = sizeof(WINDOWPLACEMENT);
    GetWindowPlacement(hWnd, &wp);
 
    if(SW_MINIMIZE == wp.showCmd || SW_SHOWMINIMIZED == wp.showCmd)
        ShowWindow(hWnd, SW_RESTORE);
    else
    {
        AttachThreadInput(oldThread, currentThread, TRUE);
        SetActiveWindow(hWnd);
        SetForegroundWindow(hWnd);
        BringWindowToTop(hWnd);
        SetFocus(hWnd);
        AttachThreadInput(oldThread, currentThread, FALSE);
    }
    RECT r;
    GetClientRect(hWnd, &r);
    InvalidateRect(hWnd, &r, true);
    UpdateWindow(hWnd);
    return true;
}