C++ - 存取Windows機碼

作業系統：Windows 7
開發工具：Visual Studio 2010
程式語言：C/C++
程式功能：讀取與修改Windows機碼，範例是關閉Windows 7錯誤回報的顯示。
//HKEY_CURRENT_USER\Software\Microsoft\Windows\Windows Error Reporting
//"DontShowUI"=dword:00000001

#include <stdlib.h>
#include <Windows.h>
#include <atlconv.h>

long reg()
{
    HKEY hKey;
    long errorlevel = 0L;
    char* reg_video_path = "Software\\Microsoft\\Windows\\Windows Error Reporting"; // Registry path
    char* value_name = "DontShowUI"; // The key
    DWORD dwType = 0x00000000, dwSize = 0x00000000;
    DWORD data = 0x00000000;

    USES_CONVERSION;

    // Step 1: open key.
    errorlevel = RegOpenKeyExW(HKEY_CURRENT_USER, A2W(reg_video_path), 0, KEY_ALL_ACCESS, &hKey);
    if(errorlevel != ERROR_SUCCESS) return errorlevel;

    // Step 2: read size. (necessary)
    errorlevel = RegQueryValueEx(hKey, A2W(value_name), NULL, &dwType, NULL, &dwSize);
    if(errorlevel != ERROR_SUCCESS) return errorlevel;

    // Step 3: read value.
    errorlevel = RegQueryValueExW(hKey, A2W(value_name), NULL, &dwType, (LPBYTE)&data, &dwSize);
    if(errorlevel != ERROR_SUCCESS) return errorlevel;

    // TODO: set new data.

    // Step 4: set value.
    errorlevel = RegSetValueExW(hKey, A2W(value_name), 0, REG_DWORD, (const BYTE*)&data, sizeof(DWORD));
    if(errorlevel != ERROR_SUCCESS) return errorlevel;

    // step 5: close key.
    errorlevel = RegCloseKey(hKey);
    if(errorlevel != ERROR_SUCCESS) return errorlevel;

    return 0L;
}

Windows的版本不同，機碼名稱和值也可能不同，所以要針對作業系統的版本去寫。