#include <windows.h>

int main()
{
    HKEY hKey;
    DWORD dwValue = 1234;
    DWORD dwType = REG_DWORD;
    DWORD dwSize = sizeof(DWORD);
    LPCWSTR lpSubKey = L"SOFTWARE\\MyApp";
    LPCWSTR lpValueName = L"MyValue";

    // レジストリキーを開く
    if (RegOpenKeyExW(HKEY_CURRENT_USER, lpSubKey, 0, KEY_SET_VALUE, &hKey) != ERROR_SUCCESS)
    {
        return 1;
    }

    // DWORD値を書き込む
    if (RegSetValueExW(hKey, lpValueName, 0, dwType, (LPBYTE)&dwValue, dwSize) != ERROR_SUCCESS)
    {
        RegCloseKey(hKey);
        return 1;
    }

    RegCloseKey(hKey);
    return 0;
}