I found a different behavior on WaitForInputIdle between Vista x64 SP1 and Windows 7 x64 RC.

- Launch an application (not console) by CreateProcess.
- Then, wait for input idle on the process by WaitForInputIdle with INFINITE.
- WaitForInputIde returns zero. (succeeded)
- After this, try FindWindow to get HWND of this application.
- FindWindow returns a valid HWND on Vista, but NULL is returned on Win7 RC.

Is this a design on Win7? It looks like an application is launching faster than Vista, but if the API's behavior has been changed, we cannot compare with by this way.

Anyway, I would like to know how to get a HWND created just after CreateProcess on Win7.

P.S.

Additional comment for my feedback almost a month ago.
This code will excute a MFC dialog-base application, which is a private application for test created by VC Wizard.
(rough code for explanation.)


PROCESS_INFORMATION pi;
STARTUPINFO si;
ZeroMemory(&pi, sizeof(pi));
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = SW_SHOWNORMAL;

BOOL bRet = CreateProcess(NULL, szCmd, NULL, NULL, FALSE, 0, NULL, szDir, &si, &pi);
ASSERT(bRet);
ASSERT(pi.hProcess != INVALID_HANDLE_VALUE);

DWORD dwRet = WaitForInputIdle(pi.hProcess, INFINITE);
ASSERT(dwRet == 0);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);

HWND hWnd = FindWindow(NULL, szName);
ASSERT(hWnd != NULL); // NULL on Win7. Not NULL on Vista.

In this case, there are two applications, the caller (this code itself) and callee,
and the caller launches the callee while the caller is launching.