mfc 注册表

#include <windows.h>

typedef BOOL(WINAPI* LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
BOOL RegWriteString(HKEY hKey, string keyName, string keyValue, bool valueResult)
{
  if (keyValue == "") {
    return valueResult;
  }
  return RegSetValueEx(hKey, keyName.c_str(), 0, REG_SZ, (const BYTE*)keyValue.c_str(), strlen(keyValue.c_str()));
}

LPFN_ISWOW64PROCESS
fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
  GetModuleHandle("kernel32"), "IsWow64Process");

BOOL SystemUtil::IsWow64()
{
  BOOL bIsWow64 = FALSE;

  if (NULL != fnIsWow64Process)
  {
    if (!fnIsWow64Process(GetCurrentProcess(), &bIsWow64))
    {
      // handle error
    }
  }
  return bIsWow64;
}
/// <summary>
/// 读取指定的key
/// </summary>
/// <param name="displayName"></param>
/// <returns></returns>
/// <summary>
/// 获取32/64对应的注册表值
/// </summary>
/// <returns></returns>
string GetUninstallKey() {
  if (IsWow64()) {
    return  "SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\";
  }
  else {
    return   "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\";
  }
}
CString GetRegKeyString(string displayName, const char* subKey) {
  string key = GetUninstallKey() + displayName;
  LONG ires;
  HKEY hMyKey;
  DWORD Type = REG_SZ;
  DWORD count = 256;
  byte mstr[256] = "";
  ires = RegOpenKeyEx(HKEY_LOCAL_MACHINE, key.c_str(), 0,
    KEY_READ, &hMyKey);
  if (ERROR_SUCCESS != ires)
    return "";
  else
    ires = RegQueryValueEx(hMyKey, subKey, 0, &Type,
      mstr, &count);
  ires = RegCloseKey(hMyKey);
  CString tms = (LPCTSTR)mstr;

  return tms;
}

读取注册表DWORD

  HKEY key;
  LPBYTE path_Get = new BYTE[254];
  DWORD type = REG_SZ;
  DWORD dwBytes = 254;

  DWORD dwordValue = 0;
  if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "key", 0, KEY_READ, &key) == ERROR_SUCCESS)
  {
    if (RegQueryValueEx(key, "item", NULL, &type, (PBYTE)&dwordValue, &dwBytes) == ERROR_SUCCESS) {
      //dwordValue 为实际值
    }
  }

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