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如何使用C++获取硬盘代码
2023-07-06 10:17:16 深夜i     11     0
C++ 硬盘 获取 代码

当需要了解硬盘的状态或信息时，编写一个硬盘代码是一种有效的方法。在C++编程中，我们可以使用以下方法来获取硬盘代码：

1. 使用API函数

API函数提供了访问系统硬件的方法。在Windows系统中，我们可以使用以下API函数来获取硬盘信息：

- GetDiskFreeSpace：获取硬盘的可用空间

- GetFileInformationByHandle：获取硬盘文件的信息

- GetVolumeInformation：获取硬盘卷标和序列号等信息

2. 使用WMI

WMI（Windows Management Instrumentation）提供了一种访问系统信息的方法。我们可以使用WMI C++库来在C++程序中获取硬盘信息。

下面是一个使用WMI获取硬盘信息的示例程序：

#include <iostream>
#include <comdef.h>
#include <Wbemidl.h>
#pragma comment(lib, "wbemuuid.lib")
using namespace std;
int main()
{
  HRESULT hres;
  // Initialize COM.
  hres = CoInitializeEx(0, COINIT_MULTITHREADED);
  if (FAILED(hres))
  
    cout << "Failed to initialize COM library. Error code = 0x" << hex << hres << endl;
    return 1;
  
  // Initialize security.
  hres = CoInitializeSecurity(
    NULL,
    -1,
    NULL,
    NULL,
    RPC_C_AUTHN_LEVEL_DEFAULT,
    RPC_C_IMP_LEVEL_IMPERSONATE,
    NULL,
    EOAC_NONE,
    NULL
  );
  if (FAILED(hres))
  {
    cout << "Failed to initialize security. Error code = 0x" << hex << hres << endl;
    CoUninitialize();
    return 1;
  }
  // Obtain WMI initial namespace.
  IWbemLocator* pLoc = NULL;
  hres = CoCreateInstance(
    CLSID_WbemLocator,
    0,
    CLSCTX_INPROC_SERVER,
    IID_IWbemLocator, (LPVOID*)&pLoc);
  if (FAILED(hres))
  {
    cout << "Failed to create IWbemLocator object. Error code = 0x" << hex << hres << endl;
    CoUninitialize();
    return 1;
  }
  IWbemServices* pSvc = NULL;
  // Connect to the root\cimv2 namespace with the current user and obtain pointer to the namespace.
  hres = pLoc->ConnectServer(
    _bstr_t(L"ROOT\\CIMV2"),
    NULL,
    NULL,
    0,
    NULL,
    0,
    0,
    &pSvc
  );
  if (FAILED(hres))
  {
    cout << "Could not connect. Error code = 0x" << hex << hres << endl;
    pLoc->Release();
    CoUninitialize();
    return 1;
  }
  // Set the security to the connection
  hres = CoSetProxyBlanket(
    pSvc,
    RPC_C_AUTHN_DEFAULT,
    RPC_C_AUTHZ_DEFAULT,
    NULL,
    RPC_C_AUTHN_LEVEL_CALL,
    RPC_C_IMP_LEVEL_IMPERSONATE,
    NULL,
    EOAC_NONE
  );
  if (FAILED(hres))
  {
    cout << "Could not set proxy blanket. Error code = 0x" << hex << hres << endl;
    pSvc->Release();
    pLoc->Release();
    CoUninitialize();
    return 1;
  }
  // Use the IWbemServices pointer to make requests of WMI
  IEnumWbemClassObject* pEnumerator = NULL;
  hres = pSvc->ExecQuery(
    _bstr_t("WQL"),
    _bstr_t("SELECT * FROM Win32_LogicalDisk"),
    WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
    NULL,
    &pEnumerator
  );
  if (FAILED(hres))
  {
    cout << "Query for logical disks failed. Error code = 0x" << hex << hres << endl;
    pSvc->Release();
    pLoc->Release();
    CoUninitialize();
    return 1;
  }
  // Get the data from the query
  IWbemClassObject* pclsObj = NULL;
  ULONG uReturn = 0;
  while (pEnumerator)
  {
    hres = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);
    if (0 == uReturn)
    
      break;
    
    VARIANT vtProp;
    // Get the property value.
    hres = pclsObj->Get(L"DeviceID", 0, &vtProp, 0, 0);
    wcout << " DeviceID : " << vtProp.bstrVal << endl;
    VariantClear(&vtProp);
    hres = pclsObj->Get(L"FreeSpace", 0, &vtProp, 0, 0);
    wcout << " FreeSpace : " << vtProp.uintVal << endl;
    VariantClear(&vtProp);
    hres = pclsObj->Get(L"Size", 0, &vtProp, 0, 0);
    wcout << " Size : " << vtProp.uintVal << endl;
    VariantClear(&vtProp);
    hres = pclsObj->Get(L"VolumeSerialNumber", 0, &vtProp, 0, 0);
    wcout << " VolumeSerialNumber : " << vtProp.bstrVal << endl;
    VariantClear(&vtProp);
    cout << endl;
    pclsObj->Release();
  }
  // Cleanup
  pSvc->Release();
  pLoc->Release();
  pEnumerator->Release();
  CoUninitialize();
  return 0;
}

这个程序使用WMI连接和查询Win32_LogicalDisk类来获取硬盘信息。它将查询返回的硬盘信息输出到控制台上。

总结

使用API函数和WMI是获取硬盘信息的常用方法。这些方法可以帮助你编写C++代码来获取硬盘信息，以便你更好地了解你的系统并进行必要的操作。

  
  

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