Qt/C++ 获取QProcess启动的第三方软件的窗体标题

Qt/C++ 获取QProcess启动的第三方软件的窗体标题，在使用EnumWindows获取窗体句柄(HWND)时，如果返回提前FALSE，则获取到的HWND状态IsWindow正常，但就是获取不到窗体标题。必须正常返回TRUE才能使用HWND获取到窗体标题，要不然获取到的标题内容就是空。

QProcess线程需要在启动后等待几秒的时间再获取打开的窗体句柄，或者一直While(true)获取窗体句柄直到获取HWND不为空为止。

使用EnumWindows获取所有窗体句柄和PID

写法1

static HWND GHO_HWMD_C=nullptr;
static BOOL CALLBACK EnumChildProc(HWND hwnd, LPARAM lParam)
{
 	DWORD processId;
    GetWindowThreadProcessId(hwnd, &processId);
	if (processId == (DWORD)lParam)
    {
		GHO_HWMD_C=hwnd;
	}
	///必须返回true 如果返回false 会造成HWND不能获取窗体标题，修改窗体隐藏等属性
	return TRUE;
}

static BOOL CALLBACK EnumThreadChildProc(HWND hwnd, LPARAM lParam)
{
	DWORD processId;
    GetWindowThreadProcessId(hwnd, &processId);
	if (processId == (DWORD)lParam)
    {
		GHO_HWMD_C=hwnd;
	}
	///必须返回true 如果返回false 会造成HWND不能获取窗体标题，修改窗体隐藏等属性
	return TRUE;
}


static BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
 	DWORD processId;
    GetWindowThreadProcessId(hwnd, &processId);
 	if (processId == (DWORD)lParam)
    {
		GHO_HWMD_C=hwnd;
	}
	///必须返回true 如果返回false 会造成HWND不能获取窗体标题，修改窗体隐藏等属性
	return TRUE;
 	EnumChildWindows(hwnd, EnumChildProc, lParam);
    EnumThreadWindows(processId,EnumThreadChildProc, lParam);
}

//在所有线程中查找pid
//process.processId(); QProcess类processId()返回pid
EnumWindows(EnumWindowsProc, (LPARAM)process.processId());

写法2

EnumWindows([](HWND hwndparent, LPARAM lParam)->BOOL{
        DWORD processId = 0;
        GetWindowThreadProcessId(hwndparent, &processId);
		if (processId == (DWORD)lParam)
	    {
			GHO_HWMD_C=hwnd;
		}
        EnumChildWindows(hwndparent,[](HWND Chwnd, LPARAM lParam)->BOOL{
            DWORD CprocessId = 0;
            GetWindowThreadProcessId(Chwnd, &CprocessId);
            if (CprocessId == (DWORD)lParam)
		    {
				GHO_HWMD_C=hwnd;
			}
            return TRUE; // 返回TRUE以继续枚举下一个窗体
        },lParam);

        EnumThreadWindows(processId,[](HWND Thwnd, LPARAM lParam)->BOOL{
            DWORD TprocessId = 0;
            GetWindowThreadProcessId(Thwnd, &TprocessId);
            if (TprocessId == (DWORD)lParam)
		    {
				GHO_HWMD_C=hwnd;
			}
            return TRUE; // 返回TRUE以继续枚举下一个窗体
        },lParam);
        return TRUE; // 返回TRUE以继续枚举下一个窗体

    },(LPARAM)process.processId());

获取窗体标题

使用 GetWindowTextA 获取窗体标题

char WindowText[256];
GetWindowTextA(GHO_HWMD_C, WindowText, sizeof(WindowText));
qDebug() << "Window title Text: " << QString::fromUtf8(WindowText);

使用 SendMessage获取窗体标题

WCHAR WindowsTitle[MAX_PATH];
if(SendMessageW(GHO_HWMD_C, WM_GETTEXT, MAX_PATH, (LPARAM)WindowsTitle)>0)
	qDebug() <<QString::fromWCharArray(WindowsTitle);

 //const int bufferSize = 256;
 //char buffer[bufferSize];
 //SendMessageA(GHO_HWMD_C, WM_GETTEXT, bufferSize, (LPARAM)buffer)

使用 DefWindowProcA获取窗体标题

int len = SendMessageA(GHO_HWMD_C, WM_GETTEXTLENGTH, 0, 0) + 1;
// new一块len大小的内存
char *title = new char(len);
// 初始化内存为0
memset(title, 0, len);
// 发送WM_GETTEXT消息获取控件文本
DefWindowProcA(GHO_HWMD_C, WM_GETTEXT, 1024, (LPARAM)title);

使用 GetClassNameA获取窗体类名称

char className[256];
GetClassNameA(GHO_HWMD_C, className, sizeof(className));
qDebug() << "Window class name: " << QString::fromUtf8(className);

使用FindWindowEx获取窗体句柄

/*! https://linuxcpp.0voice.com/?id=132468*/
/*!
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QProcess process;
    process.start("path/to/your/executable");
    if (process.waitForStarted())
    {
        // 获取进程ID
        DWORD pid = process.processId();
        // 获取进程主窗口句柄
        HWND hwnd = nullptr;
        do
        {
            hwnd = FindWindowEx(nullptr, hwnd, nullptr, nullptr);
            DWORD windowPid;
            GetWindowThreadProcessId(hwnd, &windowPid);

            if (windowPid == pid)
            {
                // 获取窗口类名
                char className[256];
                GetClassName(hwnd, className, sizeof(className));

                qDebug() << "Window class name: " << QString::fromUtf8(className);
                break;
            }
        } while (hwnd != nullptr);

        process.waitForFinished();
    }
    return a.exec();
}

*/