program exits when shellexcute was called - winapi

Question

win7 OS, vs2008.
My program disappears when shellexcute was called,
It's a WTL project and the code like these:
*.h
COMMAND_HANDLER(IDC_BTN_LOGIN, BN_CLICKED, DoLogin)
*.cpp
LRESULT XLoginView::DoLogin(WORD, WORD, HWND, BOOL&)
{
::ShellExecute(NULL, _T("open"), _T("http://mysite.com/login.php"), NULL,NULL, SW_SHOW);
return 0;
}
when the login button was clicked, then my program was disappeard and the visual studio exit too.
Even the code is such simple as these:
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
// initialize MFC and print and error on failure
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
// TODO: code your application's behavior here.
ShellExecute(NULL, L"open", L"http://stackoverflow.com", NULL, NULL, SW_SHOW);
}
return nRetCode;
}
The site (http://stackoverflow.com) was openned only the first running or debugging, then the second time and over, the visual studio disappears at the same time.
Here is a same problem, but didn't give the reason
http://bbs.pediy.com/showthread.php?t=130968
update 2013-08-27
As IInspectable's suggestion, it works ok with local resource, but web resource.
Google Chrome is my default browser, so I trust some other browsers as default browser, then get these result below:
(1) Default browser: Google Chrome
If I directly run my program, it is ok, it works. The web resource(URL) was openned, the program doesn't crush.
But if I debug the program from visual studio's button "start debugging", not only the program exit but also visual studio exit when the button who's event code calls "ShellExcute".
(2) Default browser: Firfox or Internet Explorer
The program works, it doesn't crush or disappear whenever I run it directly or debug it from visual studio.
As the above I think maybe it's because the program's Privilege is not enough.
so I trust the code below, then the problem disappeared.
void UpPrivilege()
{
HANDLE hToken;
TOKEN_PRIVILEGES tkp;
OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken);
LookupPrivilegeValue(NULL, L"SeDebugPrivileges", &tkp.Privileges[0].Luid);
tkp.PrivilegeCount = 1;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, NULL, 0);
}

Answer 1

update 2013-08-27
As IInspectable's suggestion, it works ok with local resource, but web resource.
Google Chrome is my default browser, so I trust some other browsers as default browser, then get these result below:
(1) Default browser: Google Chrome
If I directly run my program, it is ok, it works. The web resource(URL) was openned, the program doesn't crush.
But if I debug the program from visual studio's button "start debugging", not only the program exit but also visual studio exit when the button who's event code calls "ShellExcute".
(2) Default browser: Firfox or Internet Explorer
The program works, it doesn't crush or disappear whenever I run it directly or debug it from visual studio.
As the above I think maybe it's because the program's Privilege is not enough.
so I trust the code below, then the problem disappeared.
void UpPrivilege()
{
HANDLE hToken;
TOKEN_PRIVILEGES tkp;
OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken);
LookupPrivilegeValue(NULL, L"SeDebugPrivileges", &tkp.Privileges[0].Luid);
tkp.PrivilegeCount = 1;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, NULL, 0);
}