用几个小API练手

1.复制自身程序到windows目录和系统目录下：

 1 #include <windows.h>
 2 #include <stdio.h>
 3 #include <string.h>
 4
 5 void CopySelf();
 6
 7 int main(){
 8     CopySelf();
 9     return 0;
10 }
11 void CopySelf(){
12     char szSelfName[MAX_PATH]={0};
13     char szWindowsPath[MAX_PATH]={0};
14     char szSystemPath[MAX_PATH]={0};
15
16     GetModuleFileName(NULL,szSelfName,MAX_PATH);
17     GetWindowsDirectory(szWindowsPath,MAX_PATH);
18     GetSystemDirectory(szSystemPath,MAX_PATH);
19
20     strcat(szWindowsPath,"\\backdoor.exe");
21     strcat(szSystemPath,"\\backdoor.exe");
22
23     CopyFile(szSelfName,szWindowsPath,FALSE);
24     CopyFile(szSelfName,szSystemPath,FALSE);
25 }

2.获得系统的相关信息：

 1 #include <windows.h>
 2 #include <stdio.h>
 3
 4 void GetSysInfo();
 5
 6 int main(){
 7     GetSysInfo();
 8     return 0;
 9 }
10 void GetSysInfo(){
11     char szComputerName[MAXBYTE]={0};
12     char szUserName[MAXBYTE]={0};
13     unsigned long nSize=MAXBYTE;
14     OSVERSIONINFO OsVer;
15
16     OsVer.dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
17     GetVersionEx(&OsVer);
18
19     if(OsVer.dwPlatformId==VER_PLATFORM_WIN32_NT){
20         if(OsVer.dwMajorVersion==5&&OsVer.dwMinorVersion==1)
21             printf("Windows XP %s \r\n",OsVer.szCSDVersion);
22         else if(OsVer.dwMajorVersion==5&&OsVer.dwMinorVersion==0)
23             printf("Windows 2K \r\n");
24     }else{
25         printf("Other System \r\n");
26     }
27
28     GetComputerName(szComputerName,&nSize);
29     printf("Computer Name is %s \r\n",szComputerName);
30
31     nSize=MAXBYTE;
32     GetUserName(szUserName,&nSize);
33     printf("User Name is %s \r\n",szUserName);
34 }