获取OCX的版本号

 ocx一般会在注册表中注册一个CLSID，一般在HKEY_LOCAL_MACHINE/SOFTWARE/CLASSES/CLSID

下。

        读取ocx的版本号主要分为以下几个步骤：

1.获得ocx的CLSID

有些ocx提供GetClsid函数，该函数的功能是返回其CLSID结构，然后下面的程序将该CLSID结构进行解析：

GetCLSID()

{

              CLSID clsid;

              memset(&clsid,0,sizeof(CLSID));

              clsid = m_pXCDFRDCtrl->GetClsid();//m_pXCDFRDCtrl为ocx控件的指针

              CString sid = "";

              CString lastid = "";

              lastid.Format("%X%X-%X%X%X%X%X%X}",clsid.Data4[0],clsid.Data4[1],

                            clsid.Data4[2],clsid.Data4[3],clsid.Data4[4],clsid.Data4[5],

                            clsid.Data4[6],clsid.Data4[7]);

              sid.Format("{%X-%X-%X-",clsid.Data1,clsid.Data2,clsid.Data3);

              sid += lastid;

              return sid;

}

这里解析出来的sid为{68A2CDE0-F378-46E2-9446-BC4179CCF339}，一般CLSID在注册表的如下位置中：

HKEY_LOCAL_MACHINE/SOFTWARE/Classes/CLSID/

2.获得ocx的注册路径

读注册表中的值

程序如下：

GetOcxPath(const CString clsid)

{

              HKEY key;

              DWORD dwType;

              CString RegDir;

              char szPath[MAX_PATH] = {0};

              DWORD dwSize = MAX_PATH;

              LONG lReturn = ERROR_SUCCESS;

              RegDir.LoadString(IDS_OCX_PATH); //这里的IDS_OCX_PATH为

                                                                                   // HKEY_LOCAL_MACHINE/SOFTWARE/Classes/CLSID/

              RegDir += clsid;

              RegDir += "//InprocServer32";

             

              lReturn = RegOpenKeyEx(HKEY_LOCAL_MACHINE, RegDir, 0, KEY_QUERY_VALUE, &key);

              lReturn = RegQueryValueEx(key, NULL, NULL, &dwType, (LPBYTE)szPath, &dwSize);

              return szPath;

}

这里的注册表键InprocServer32存储了ocx的注册路径，读取到szPath中返回。

3.获得ocx的版本号

完成此功能的API函数为GetFileVersion(ocxPath)，这里的ocxPath是指步骤2返回的注册路径

GetFileVersion(CString& strFileName)

{

              CString strTempName = strFileName;

              DWORD   dwFileType = VFT_UNKNOWN;    

              DWORD   dwVerInfoBytes;    

              DWORD   dwHandle;    

              LPBYTE pVerInfo    = NULL;    

              VS_FIXEDFILEINFO*   pFixedFileInfo   =   NULL;    

              UINT   uiLength;    

              HRESULT hResult                         =   S_OK;  

              char* pBuffer = NULL;

              CString strVersion = "";

 //Call this API first to get the Version

dwVerInfoBytes = GetFileVersionInfoSize(strTempName.GetBuffer(0),&dwHandle);    

              if   (dwVerInfoBytes   ==   0)    

                            return   HRESULT_FROM_WIN32(::GetLastError());       

              //Allocate memory to hold the version information for the specified file.    

              try    

              {    

                            pVerInfo = new BYTE[dwVerInfoBytes];    

              }    

              catch(CMemoryException* e)    

              {    

                            e->Delete();          

              }

    if(::GetFileVersionInfo(strTempName.GetBuffer(0),0,dwVerInfoBytes,pVerInfo)   && ::VerQueryValue(pVerInfo, _T("//"), (LPVOID*)&pFixedFileInfo, &uiLength))     

              {

                  //format the version number into the format such as 2.1.0.0

                   strVersion.Format("%d.%d.%d.%d",

HIWORD(pFixedFileInfo->dwFileVersionMS), LOWORD(pFixedFileInfo->dwFileVersionMS),

HIWORD(pFixedFileInfo->dwFileVersionLS),

                  LOWORD(pFixedFileInfo->dwFileVersionLS));        

return strVersion;

}

这里返回的strVersion即是ocx的版本号！