C / C++ / MFC

georgemarios wrote:

If the app is SDI, can display only one view of one doc at a time

"Take only what you need and leave the land as you found it." - Native American Proverb

"Take only what you need and leave the land as you found it." - Native American Proverb

m_dlgTest.Create( IDD_DIALOG1, this );
m_dlgTest.ShowWindow( SW_SHOW );

DaveDrPop wrote:

is there any way of calling from the .dll back into the .exe ?

in the DLL:
 
// define the function type
typedef double      (CALLBACK* MyCALLBACKPTR)(int param1, int param2);
 
MyCALLBACKPTR globalCallback = NULL;
 
// export this function
void SetDLLCallback(MyCALLBACKPTR p)
{
  globalCallback = p;
}
 
// when the DLL wants something from the EXE
...
if (globalCallback!=NULL)
{
   // call the callback
   double v = *(globalCallback)(a,b);
}
 
 
in the EXE:
double CALLBACK foo(int a, int b)
{
  // the DLL has called this function, give it something in return..
  return 3.14156;
}
 
// tell the DLL where to call
SetDLLCallback(foo);

CString strDrive;
strDrive.Format("\\\\.\\%c:", 'C');
HANDLE hDrive = CreateFile(strDrive,  GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE,
                            NULL, OPEN_EXISTING, FILE_FLAG_NO_BUFFERING, NULL);
DWORD dwRet;

BOOL bWritable = DeviceIoControl(hDrive, IOCTL_DISK_IS_WRITABLE, NULL, 0, NULL, 0,
                                    &dwRet, NULL);