C语言注册表操作实例

 

 

例子1：

#include <stdio.h>
#include <windows.h>
int main(void)
{
charregname[]="Software\\Microsoft\\Windows\\CurrentVersion\\Run";
HKEY hkResult;
intret=RegOpenKey(HKEY_LOCAL_MACHINE,regname,&hkResult);

ret=RegSetValueEx(hkResult,"hacker",0,REG_EXPAND_SZ,(unsigned char*)"%systemroot%\\hacker.exe",25);
if(ret==0){
printf("success to write run key\n");
RegCloseKey(hkResult);
}
else {
    printf("failed to open regedit.%d\n",ret);
    return 0;
}
char modlepath[256];
char syspath[256];
GetModuleFileName(0,modlepath,256);//取得程序名字
GetSystemDirectory(syspath,256);
ret=CopyFile(modlepath,strcat(syspath,"\\hacker.exe"),1);
if(ret)
{
    printf("%s has been copyed to sys dir%s\n",modlepath,syspath);
}
else printf("%s is exisis",modlepath);
return 0;
}

例子2：

#include <windows.h >
#include <stdio.h >
void   main()
{
  HKEY       hKey;       
  char       SubKeyName[]     =     "SOFTWARE\\Microsoft\\Internet       Explorer\\Security";       
    char       ValueName[]       =     "BlockXBM";       
        
    BYTE       ValueData[64];       
    DWORD       Buffer;       
        
    //打开       
    if   (RegOpenKeyEx(HKEY_LOCAL_MACHINE,SubKeyName,0,KEY_ALL_ACCESS,&hKey)       !=       ERROR_SUCCESS)       
    {       
        printf(     "Error:       Regedit       cannot       be       opened!");       
    }       
    else       
    {       
    //读原来的键值       
    Buffer       =       sizeof       (ValueData);       
    if       (RegQueryValueEx(hKey,ValueName,0,NULL,ValueData,&Buffer)       !=       ERROR_SUCCESS)       
    {       
    //不存在       
    //新建一个值为0的DWORD       
    DWORD       temp       =       0;       
    if       (RegSetValueEx(hKey,ValueName,0,REG_DWORD,(LPBYTE)&temp,sizeof(DWORD))       !=       ERROR_SUCCESS)       
    {       
        printf(   "Error:       Create       Value       failed");       
    }       
    RegCloseKey(hKey);       
    }       
    else       
    {       
    //存在       
    //改变值       
    DWORD       temp       =       0;       
    if       (RegSetValueEx(hKey,ValueName,0,REG_DWORD,(LPBYTE)&temp,sizeof(DWORD))       !=       ERROR_SUCCESS)       
    {       
    printf(   "Error:       Change       Value       failed");       
    RegCloseKey(hKey);       
    }       
    }       
    }       
}

 

用C语言操作注册表以及上一篇的WinApi操作注册表之外还可以用MFC提供的CRegKey类以及 CWinApp提供的SetRegistryKey函数

SetRegistryKey 这个函数功能是设置MFC程序的注册表访问键，并把读写 ini文件的成员函数映射到读写注册表。只要调用一下 SetRegistryKey并指定注册表键值，那么下面6个成员函数，就被映射到进行注册表读取了~

WriteProfileBinaryWrites binary data to an entry in the application's.INI file.WriteProfileIntWrites an integer to an entry in the application's.INI file.WriteProfileStringWrites a string to an entry in the application's.INI file.
GetProfileBinaryRetrieves binary data from an entry in theapplication's .INI file.GetProfileIntRetrieves an integer from an entry in theapplication's .INI file.GetProfileStringRetrieves a string from an entry in theapplication's .INI file.
MSDN上面写上面6个函数是写到INI文件的。所以俺就忽略了其访问注册表的功能。无意中看了其MFC实现才有所了解。

例子如下：
SetRegistryKey(_T("boli's app"));//这里是准备在注册表HKEY_CURRENT_USER\\software 下面生成一个boli's app分支~为什么说是准备呢？因为如果不调用相关函数，如上面提到的6个函数，它是不会真正读写注册表的。具体本文最最下面的MFC实现摘录。
CString strUserName,strPassword;
WriteProfileString("LogInfo","UserName",strUserName);//向注册表HKEY_CURRENT_USER\\software\\boli's app\\LogInfo\\分支下写入UserName 字符串行键值~
WriteProfileString("LogInfo","Password",strPassword);//同上~

strUserName = GetProfileString("LogInfo","UserName");//这里是读取HKEY_CURRENT_USER\\software\\boli's app\\LogInfo\\分支下的UserName 字符串键值到 strUserName~
strPassword = GetProfileString("LogInfo","Password");

如果不是在CWinApp 派生的类中读写注册表，可以直接用：
strUserName = theApp.GetProfileString("LogInfo","UserName");
strPassword = theApp.GetProfileString("LogInfo","Password");
或
strUserName =AfxGetApp()->GetProfileString("LogInfo","UserName");