有谁知道_CRTMainStartup源码是什么样子的？

除了内存申请函数之外，_CRTMainStartup还可能调用哪些windows的API？

8 个解决方案

#1

不如说说为啥想问这个问题吧。

#2

除了初始化全局或静态对象之外，还干什么？

#3

$(VC)/CRT/SRC/CRT0.C 这东西自己找三 ...

#4

我想把一个vc6编译的程序直接用被改造的bochs虚拟机执行，不使用操作系统

#5

int wmainCRTStartup(
#else  /* WPRFLAG */
int mainCRTStartup(
#endif  /* WPRFLAG */

#endif  /* _WINMAIN_ */

        void
        )

{
        int initret;
        int mainret;
        OSVERSIONINFOA *posvi;
        int managedapp;
#ifdef _WINMAIN_
        _TUCHAR *lpszCommandLine;
        STARTUPINFO StartupInfo;
#endif  /* _WINMAIN_ */
        /*
         * Dynamically allocate the OSVERSIONINFOA buffer, so we avoid
         * triggering the /GS buffer overrun detection.  That can't be
         * used here, since the guard cookie isn't available until we
         * initialize it from here!
         */
        posvi = (OSVERSIONINFOA *)_alloca(sizeof(OSVERSIONINFOA));

        /*
         * Get the full Win32 version
         */
        posvi->dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);
        (void)GetVersionExA(posvi);

        _osplatform = posvi->dwPlatformId;
        _winmajor = posvi->dwMajorVersion;
        _winminor = posvi->dwMinorVersion;

        /*
         * The somewhat bizarre calculations of _osver and _winver are
         * required for backward compatibility (used to use GetVersion)
         */
        _osver = (posvi->dwBuildNumber) & 0x07fff;
        if ( _osplatform != VER_PLATFORM_WIN32_NT )
            _osver |= 0x08000;
        _winver = (_winmajor << 8) + _winminor;

        /*
         * Determine if this is a managed application
         */
        managedapp = check_managed_app();

#ifdef _MT
        if ( !_heap_init(1) )               /* initialize heap */
#else  /* _MT */
        if ( !_heap_init(0) )               /* initialize heap */
#endif  /* _MT */
            fast_error_exit(_RT_HEAPINIT);  /* write message and die */

#ifdef _MT
        if( !_mtinit() )                    /* initialize multi-thread */
            fast_error_exit(_RT_THREAD);    /* write message and die */
#endif  /* _MT */

        /*
         * Initialize the Runtime Checks stuff
         */
#ifdef _RTC
        _RTC_Initialize();
#endif  /* _RTC */
        /*
         * Guard the remainder of the initialization code and the call
         * to user's main, or WinMain, function in a __try/__except
         * statement.
         */

        __try {

            if ( _ioinit() < 0 )            /* initialize lowio */
                _amsg_exit(_RT_LOWIOINIT);

#ifdef WPRFLAG
            /* get wide cmd line info */
            _wcmdln = (wchar_t *)__crtGetCommandLineW();

            /* get wide environ info */
            _wenvptr = (wchar_t *)__crtGetEnvironmentStringsW();

            if ( _wsetargv() < 0 )
                _amsg_exit(_RT_SPACEARG);
            if ( _wsetenvp() < 0 )
                _amsg_exit(_RT_SPACEENV);
#else  /* WPRFLAG */
            /* get cmd line info */
            _acmdln = (char *)GetCommandLineA();

            /* get environ info */
            _aenvptr = (char *)__crtGetEnvironmentStringsA();

            if ( _setargv() < 0 )
                _amsg_exit(_RT_SPACEARG);
            if ( _setenvp() < 0 )
                _amsg_exit(_RT_SPACEENV);
#endif  /* WPRFLAG */

            initret = _cinit(TRUE);                  /* do C data initialize */
            if (initret != 0)
                _amsg_exit(initret);

#ifdef _WINMAIN_

            StartupInfo.dwFlags = 0;
            GetStartupInfo( &StartupInfo );

#ifdef WPRFLAG
            lpszCommandLine = _wwincmdln();
            mainret = wWinMain(
#else  /* WPRFLAG */
            lpszCommandLine = _wincmdln();
            mainret = WinMain(
#endif  /* WPRFLAG */
                               GetModuleHandleA(NULL),
                               NULL,
                               lpszCommandLine,
                               StartupInfo.dwFlags & STARTF_USESHOWWINDOW
                                    ? StartupInfo.wShowWindow
                                    : SW_SHOWDEFAULT
                             );
#else  /* _WINMAIN_ */

#ifdef WPRFLAG
            __winitenv = _wenviron;
            mainret = wmain(__argc, __wargv, _wenviron);
#else  /* WPRFLAG */
            __initenv = _environ;
            mainret = main(__argc, __argv, _environ);
#endif  /* WPRFLAG */

#endif  /* _WINMAIN_ */

            if ( !managedapp )
                exit(mainret);

            _cexit();

        }
        __except ( _XcptFilter(GetExceptionCode(), GetExceptionInformation()) )
        {
            /*
             * Should never reach here
             */

            mainret = GetExceptionCode();

            if ( !managedapp )
                _exit(mainret);

            _c_exit();

        } /* end of try - except */

        return mainret;
}
vc里直接跟踪一下就出来了

#6

在vc6.0安装目录下搜CRT0.C，找不到

#7

你首先要确认下有没有安装源码, 找不大才怪 ...

#8

VC如果选择安装源码的话是可以在源码目录找到的