已知进程句柄,如何知道此进程的主窗口句柄,在此说明两种方法:
1. 调用FindWindow(),前提是必须知道该进程中窗口类名和窗口名,返回后的句柄可以通过IsWindow()函数来验证是否是有效的窗口句柄.
HWND hWnd = ::FindWindow(szClassName, szWndName);
if(::IsWindow(hWnd))
{
// 处理该窗口
}
2.先枚举全部窗口,再枚举回调函数中调用GetWindowThreadProcessID()得到窗口得进程ID,再与以前得到得ID比较.如果不一致,不处理,若一致,循环调用GetParent()一直到返回NULL, 最后得hwnd即为顶层窗口句柄
BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam )
{
unsigned long id;
HWND thwnd;
id=GetWindowThreadProcessId(hwnd,NULL);
if (id==lParam)
{
while((thwnd=GetParent(hwnd))!=NULL)
hwnd=thwnd;
CString x;
x.Format("HWND = %x",hwnd);
MessageBox(NULL,x,NULL,MB_OK);
return false;
}
return true;
}
void CMt2Dlg::OnButton1()
{
// TODO: Add your control notification handler code here
STARTUPINFO StartInfo;
PROCESS_INFORMATION ProceInfo;
ZeroMemory(&StartInfo,sizeof(StartInfo));
StartInfo.cb=sizeof(StartInfo);
CreateProcess(
NULL, //lpApplicationName: PChar
"calc.exe", //lpCommandLine: PChar
NULL, //lpProcessAttributes: PSecurityAttributes
NULL, //lpThreadAttributes: PSecurityAttributes
true, //bInheritHandles: BOOL
CREATE_NEW_CONSOLE,
NULL,
NULL,
&StartInfo,
&ProceInfo);
Sleep(100); //这是必须的,因为 CreateProcess 不能马上Active windows
EnumWindows(EnumWindowsProc,ProceInfo.dwThreadId);
}
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