你是用win2k吗？每次重新启动以后，默认的登录的名就是你上一次用的。可是如果你上一次用的Administrator，每次还要改回普通用户（为了防毒和安全）好麻烦；或者你不想让其他人知道你登录过这台电脑（嘿嘿我窃取了你的QQ聊天记录……），怎么修改默认的登录用户呢？
这个小程序就是干这个的了。把它的图标拉到开始菜单的启动组里，修改快捷方式，在命令行后加上你要更改的默认登录名即可
比如：
c:\winnt\chglogon.exe flywhc
然后你用Administrator登录，然后再重新启动或者注销试试看？
附送原代码及工程文件。编译后体积 16K。但显然，如果用汇编可以做到更小。
我对减小编译后体积很感兴趣，如果有人能把这个VC做的程序编译后的体积再减小1K以上（不用任何第三方软件压缩），给我发EMAIL，我在VC版给你200分。
================= chglogon.dsp ============================
# Microsoft Developer Studio Project File - Name="chglogon" - Package Owner=<4>
# Microsoft Developer Studio Generated Build File, Format Version 6.00
# ** DO NOT EDIT **
# TARGTYPE "Win32 (x86) Application" 0x0101
CFG=chglogon - Win32 Release
!MESSAGE This is not a valid makefile. To build this project using NMAKE,
!MESSAGE use the Export Makefile command and run
!MESSAGE
!MESSAGE NMAKE /f "chglogon.mak".
!MESSAGE
!MESSAGE You can specify a configuration when running NMAKE
!MESSAGE by defining the macro CFG on the command line. For example:
!MESSAGE
!MESSAGE NMAKE /f "chglogon.mak" CFG="chglogon - Win32 Release"
!MESSAGE
!MESSAGE Possible choices for configuration are:
!MESSAGE
!MESSAGE "chglogon - Win32 Release" (based on "Win32 (x86) Application")
!MESSAGE
# Begin Project
# PROP AllowPerConfigDependencies 0
# PROP Scc_ProjName ""
# PROP Scc_LocalPath ""
CPP=cl.exe
MTL=midl.exe
RSC=rc.exe
# PROP BASE Use_MFC 0
# PROP BASE Use_Debug_Libraries 0
# PROP BASE Output_Dir "Release"
# PROP BASE Intermediate_Dir "Release"
# PROP BASE Target_Dir ""
# PROP Use_MFC 0
# PROP Use_Debug_Libraries 0
# PROP Output_Dir "Release"
# PROP Intermediate_Dir "Release"
# PROP Ignore_Export_Lib 0
# PROP Target_Dir ""
# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /Yu"stdafx.h" /FD /c
# ADD CPP /nologo /W4 /GX /O1 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /FD /c
# SUBTRACT CPP /YX /Yc /Yu
# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
# ADD BASE RSC /l 0x804 /d "NDEBUG"
# ADD RSC /l 0x804 /d "NDEBUG"
BSC32=bscmake.exe
# ADD BASE BSC32 /nologo
# ADD BSC32 /nologo
LINK32=link.exe
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386
# ADD LINK32 advapi32.lib kernel32.lib /nologo /entry:"WinMain" /subsystem:windows /machine:I386 /nodefaultlib
# Begin Target
# Name "chglogon - Win32 Release"
# Begin Group "Source Files"
# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
# Begin Source File
SOURCE=.\chglogon.cpp
# End Source File
# End Group
# Begin Group "Header Files"
# PROP Default_Filter "h;hpp;hxx;hm;inl"
# End Group
# Begin Group "Resource Files"
# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
# End Group
# End Target
# End Project
============== End =====================
============== chglogon.cpp ===============
#include <windows.h>
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
hInstance=hInstance;
hPrevInstance=hPrevInstance;
nCmdShow=nCmdShow;
lpCmdLine=GetCommandLine();
HKEY hKey;
char szBuf[255]={0},*p=lpCmdLine;
p++;
if(*p=='\"'){
while(*p!='\"' && *p!=0){
p++;
}
}else{
while(*p!=' ' && *p!=0){
p++;
}
}
p++;
int i=0;
while(*p){
szBuf[i++]=*p;
p++;
if(*p==' ') break;
}
*p=0;
::RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon",0,KEY_SET_VALUE,&hKey);
::RegSetValueEx(hKey,"DefaultUserName",0,REG_SZ,(CONST BYTE *)szBuf,i);
::RegSetValueEx(hKey,"AltDefaultUserName",0,REG_SZ,(CONST BYTE *)szBuf,i);
::RegCloseKey(hKey);
return 0;
}
=============== End ======================