C++ 实现磁盘去只读属性

磁盘去只读属性也是有两种方法，一种是diskpart工具的 ATTRIBUTES DISK CLEAR READONLY 命令，还有一种是执行WMI的带参数方法。

关于如何写C++ 调用diskpart工具和C++ WMI在前面两篇文章：C++实现磁盘联机 和 C++实现磁盘初始化中都提及到了。

直接附上代码：

1. diskpart方法：

核心代码只有一行：

ret = WriteFile(hChildStdinWr, "ATTRIBUTES DISK CLEAR READONLY",sizeof("ATTRIBUTES DISK CLEAR READONLY"), &dwWritten, NULL); 

2. WMI方法

核心代码如下：

wchar_t msftDiskObjectID[256];
GetWMIMSFTDiskObjectId(msftDiskObjectID, index);

CComPtr< IWbemClassObject > pClass = NULL;
BSTR MethodName = SysAllocString(L"SetAttributes");
BSTR ClassName = SysAllocString(L"MSFT_Disk");
hr = service->GetObject(ClassName, 0, NULL, &pClass, NULL);
if (FAILED(hr))
{
	SysFreeString(ClassName);
	SysFreeString(MethodName);
	return -1;
}

CComPtr< IWbemClassObject > pInParams = NULL;
hr = pClass->GetMethod(MethodName, 0, &pInParams, NULL);
if (FAILED(hr))
{
	SysFreeString(ClassName);
	SysFreeString(MethodName);
	return -1;
}

CComPtr< IWbemClassObject > pClassInstance = NULL;
hr = pInParams->SpawnInstance(0, &pClassInstance);
if (FAILED(hr))
{
	SysFreeString(ClassName);
	SysFreeString(MethodName);
	return -1;
}

VARIANT varCommand;
varCommand.vt = VT_BOOL;
varCommand.ulVal = FALSE;

hr = pClassInstance->Put(L"IsReadOnly", 0, &varCommand, 0);
if (FAILED(hr))
{
	SysFreeString(ClassName);
	SysFreeString(MethodName);
	return -1;
}

CComPtr< IWbemClassObject > pOutParams = NULL;
hr = service->ExecMethod(msftDiskObjectID, MethodName, 0, NULL, pClassInstance, &pOutParams, NULL);
if (FAILED(hr))
{
	SysFreeString(ClassName);
	SysFreeString(MethodName);
	return -1;
}
SysFreeString(ClassName);
SysFreeString(MethodName);
return 0;