转换Delphi Classes.pas中TResourceStream类到 VC CResourceStream类

最新推荐文章于 2015-12-17 13:35:38 发布

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最新推荐文章于 2015-12-17 13:35:38 发布

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分类专栏：程序开发及原代码 C/C++、Visual C++ 、Delphi 、BCB等) 文章标签： delphi null buffer vc++ file class

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本文档展示了如何将Delphi中的TResourceStream类转换为VC++的CResourceStream类，包括类的定义、构造函数、析构函数以及Write、SaveToFile等方法的实现。通过CResourceStream，可以方便地读取和保存资源到文件。

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/*
{ TResourceStream }
Convert by wfh,from Delphi Classes.pas
*/
class CResourceStream
{
private:
     HRSRC HResInfo;
    LPVOID HGlobal;
     INT64 m_int64Size;
    LPVOID m_Ptr;
     void Initialize(HINSTANCE Instance,LPCSTR Name,LPCSTR ResType,BOOL FromID);
     void SetPointer(LPVOID Ptr,INT64 Size);
public:
    CResourceStream(HINSTANCE Instance, LPCSTR ResName, LPSTR ResType);
    CResourceStream(HINSTANCE Instance, int ResID, LPSTR ResType);
    virtual ~CResourceStream();
    INT64 Write(LPCSTR Buffer,INT64 Count);
    void SaveToFile(LPCSTR FileName);
};

//////////////////////////////////////////////////////////////////////////
CResourceStream::CResourceStream(HINSTANCE Instance,LPCSTR ResName,LPSTR ResType)
{
Initialize(Instance, ResName, ResType, FALSE);
}

CResourceStream::CResourceStream(HINSTANCE Instance,int ResID,LPSTR ResType)
{
    CString strResID;
    strResID.Format("%s",ResID);

    Initialize(Instance, strResID, ResType, TRUE);
}

CResourceStream::~CResourceStream()
{
    UnlockResource(HGlobal);
    FreeResource(HGlobal);
    //inherited Destroy;
}

void CResourceStream::Initialize(HINSTANCE Instance,LPCSTR Name,LPCSTR ResType,BOOL FromID)
{
     m_Ptr=NULL;
     m_int64Size=0;
     HResInfo = FindResource(Instance, Name, ResType);
     if (HResInfo == NULL)
     {
         TRACE("ERROR Can't Find Resource");
         return;
     }
     HGlobal = LoadResource(Instance, HResInfo);
     if (HGlobal == NULL)
     {
         TRACE("Error Can't Load Resource");
         return;
     }
     SetPointer(LockResource(HGlobal), SizeofResource(Instance, HResInfo));
}

void CResourceStream::SetPointer(LPVOID Ptr,INT64 Size)
{
     m_Ptr=Ptr;
     m_int64Size=Size;
}
INT64 CResourceStream::Write(LPCSTR Buffer,INT64 Count)
{
    //throw EStreamError.CreateRes(@SCantWriteResourceStreamError);
    ASSERT(NULL);
    return 0;
}

void CResourceStream::SaveToFile(LPCSTR FileName)
{
HANDLE hFile=CreateFile(FileName,

GENERIC_READ|GENERIC_WRITE,

FILE_SHARE_WRITE,NULL,

CREATE_ALWAYS,

FILE_ATTRIBUTE_NORMAL,

                                                    NULL);
     if(hFile==INVALID_HANDLE_VALUE)
     {
          TRACE("CreateFile() Failed");
          return;
      }
     DWORD dwWritten;
      WriteFile(hFile,m_Ptr,(DWORD)m_int64Size,&dwWritten,NULL);
      CloseHandle(hFile);
}

范例:

用户可以在VC++工程中导入某个文件到资源文件，如NotePad.exe，资源类型类型名称"EXEFILE",资源的ID为"IDR_NOTEPAD"。那么将从资源文件生成Notepad.exe程序代码如下

CResourceStream resourceStream(AfxGetInstanceHandle(),"IDR_NOTEPAD","EXEFILE");

resourceStream.SaveToFile("Notepad.exe");