下面的 _tWinMain中哪种情况下执行 while内的代码?哪种情况下执行 if内的代码?
while和if分别是什么作用extern "C" int WINAPI _tWinMain(HINSTANCE hInstance,
HINSTANCE /*hPrevInstance*/, LPTSTR lpCmdLine, int /*nShowCmd*/)
{
lpCmdLine = GetCommandLine(); //this line necessary for _ATL_MIN_CRT#if _WIN32_WINNT >= 0x0400 & defined(_ATL_FREE_THREADED)
HRESULT hRes = CoInitializeEx(NULL, COINIT_MULTITHREADED);
#else
HRESULT hRes = CoInitialize(NULL);
#endif
_ASSERTE(SUCCEEDED(hRes));
_Module.Init(ObjectMap, hInstance, &LIBID_ATLSAMPLEEXELib);
_Module.dwThreadID = GetCurrentThreadId();
TCHAR szTokens[] = _T("-/"); int nRet = 0;
BOOL bRun = TRUE;
LPCTSTR lpszToken = FindOneOf(lpCmdLine, szTokens);
while (lpszToken != NULL)
{
if (lstrcmpi(lpszToken, _T("UnregServer"))==0)
{
_Module.UpdateRegistryFromResource(IDR_ATLSampleExe, FALSE);
nRet = _Module.UnregisterServer(TRUE);
bRun = FALSE;
break;
}
if (lstrcmpi(lpszToken, _T("RegServer"))==0)
{
_Module.UpdateRegistryFromResource(IDR_ATLSampleExe, TRUE);
nRet = _Module.RegisterServer(TRUE);
bRun = FALSE;
break;
}
lpszToken = FindOneOf(lpszToken, szTokens);
} if (bRun)
{
_Module.StartMonitor();
#if _WIN32_WINNT >= 0x0400 & defined(_ATL_FREE_THREADED)
hRes = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER,
REGCLS_MULTIPLEUSE | REGCLS_SUSPENDED);
_ASSERTE(SUCCEEDED(hRes));
hRes = CoResumeClassObjects();
#else
hRes = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER,
REGCLS_MULTIPLEUSE);
#endif
_ASSERTE(SUCCEEDED(hRes)); MSG msg;
while (GetMessage(&msg, 0, 0, 0))
DispatchMessage(&msg); _Module.RevokeClassObjects();
Sleep(dwPause); //wait for any threads to finish
} _Module.Term();
CoUninitialize();
return nRet;
}
while和if分别是什么作用extern "C" int WINAPI _tWinMain(HINSTANCE hInstance,
HINSTANCE /*hPrevInstance*/, LPTSTR lpCmdLine, int /*nShowCmd*/)
{
lpCmdLine = GetCommandLine(); //this line necessary for _ATL_MIN_CRT#if _WIN32_WINNT >= 0x0400 & defined(_ATL_FREE_THREADED)
HRESULT hRes = CoInitializeEx(NULL, COINIT_MULTITHREADED);
#else
HRESULT hRes = CoInitialize(NULL);
#endif
_ASSERTE(SUCCEEDED(hRes));
_Module.Init(ObjectMap, hInstance, &LIBID_ATLSAMPLEEXELib);
_Module.dwThreadID = GetCurrentThreadId();
TCHAR szTokens[] = _T("-/"); int nRet = 0;
BOOL bRun = TRUE;
LPCTSTR lpszToken = FindOneOf(lpCmdLine, szTokens);
while (lpszToken != NULL)
{
if (lstrcmpi(lpszToken, _T("UnregServer"))==0)
{
_Module.UpdateRegistryFromResource(IDR_ATLSampleExe, FALSE);
nRet = _Module.UnregisterServer(TRUE);
bRun = FALSE;
break;
}
if (lstrcmpi(lpszToken, _T("RegServer"))==0)
{
_Module.UpdateRegistryFromResource(IDR_ATLSampleExe, TRUE);
nRet = _Module.RegisterServer(TRUE);
bRun = FALSE;
break;
}
lpszToken = FindOneOf(lpszToken, szTokens);
} if (bRun)
{
_Module.StartMonitor();
#if _WIN32_WINNT >= 0x0400 & defined(_ATL_FREE_THREADED)
hRes = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER,
REGCLS_MULTIPLEUSE | REGCLS_SUSPENDED);
_ASSERTE(SUCCEEDED(hRes));
hRes = CoResumeClassObjects();
#else
hRes = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER,
REGCLS_MULTIPLEUSE);
#endif
_ASSERTE(SUCCEEDED(hRes)); MSG msg;
while (GetMessage(&msg, 0, 0, 0))
DispatchMessage(&msg); _Module.RevokeClassObjects();
Sleep(dwPause); //wait for any threads to finish
} _Module.Term();
CoUninitialize();
return nRet;
}
if的作用是分析命令行参数的含义,决定是注册 or 注销.
没有命令行参数时,while内代码不会执行!