// ResFile.h

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#ifndef ResFileh
#define ResFileh

/* CResFile allows Read-Only File-like access to a DATA resource.
From Visual Studio enter: [Insert Menu][Resource...][Import...][All Files (*.*)] DATA
 Then load the file you want to access as a Resource.
DATA is a Predefined Resource Type and can easily be accessed using RT_RCDATA.
 Usage:
  char Buf[6];
  
  CResFile ResFile(nID);
  ResFile.Read(Buf,6);
  ResFile.Rewind();
or
  CResFile ResFile;
  if(ResFile.Open(nID)) {
    ResFile.Read(Buf,6);
    ResFile.Close();
  }
*/

class CResFile : public CMemFile {
public:
  CResFile() {}
  virtual ~CResFile() {try{Close();}catch(...){}}
  CResFile (int nID)  {VERIFY(Open(nID));}
  bool Open(int nID)  {
    HMODULE hModule=AfxGetResourceHandle();
    HRSRC  hResInfo=FindResource(hModule, MAKEINTRESOURCE(nID), RT_RCDATA);
    if(!hResInfo) return false;
    HGLOBAL hResData=LoadResource(hModule,hResInfo);
    if(!hResData) return false;
    LPBYTE ptr=(LPBYTE)LockResource(hResData); //No need to unlock.
    DWORD Size=SizeofResource(hModule, hResInfo)-1;
    if(!ptr || !Size) return false;
    Attach(ptr,Size);
    return true;
  }
  void Close() {Detach();}
  void SetLength(DWORD dwNewLen)             {TRACE("Attemping to SetLength on READ-ONLY CResFile!"); ASSERT(true);}
  void Write(const void* lpBuf, UINT nCount) {TRACE("Attemping to Write on READ-ONLY CResFile!"    ); ASSERT(true);}
};

#endif //ndef ResFileh