C / C++ / MFC

#pragma bss_seg("MFCDLLSample")
	TESTDLL_API HBITMAP DLLImageBmp;
#pragma bss_seg()

//obtain the CDC handle for the picture box
PicWnd = GetDlgItem(IDC_PICBOX);
PicDC  = PicWnd->GetDC();

oldBmp = (HBITMAP)PicDC->SelectObject(DLLImageBmp);

PicPaintDC.BitBlt(0, 0, 404, 404, PicDC, 0, 0, SRCCOPY);
CDialog::OnPaint();

#ifdef TESTDLL_EXPORTS
#define TESTDLL_API __declspec(dllexport)
#else
#define TESTDLL_API __declspec(dllimport)
#endif

void CSecondDlg::OnButton1() 
{
	//**BROWSE DIALOG 1**//
	   FILE *fp;
	   FILE *file1 = fopen("file1.txt","w");   //Create txt file for saving editbox content
       int nFileLong;
	   //***********************************************//
       char strFilter[] = { "CPP Files (*.cpp)|*.cpp|All Files (*.*)|*.*||" };
	   CFileDialog m_ldFile(TRUE, ".cpp", NULL, 0, strFilter);
       if (m_ldFile.DoModal() == IDOK)        //Start File dlg box
	   {
       m_sFileName=m_ldFile.GetPathName();    //Get file name
       fp=fopen(m_sFileName,"rb");            //Open file for reading
       fseek(fp,0,SEEK_END);                  //Go to file end 
       nFileLong=ftell(fp);                   //Get length
       char* sText = new char[nFileLong+1];   //reserve string space
       fseek(fp,0,SEEK_SET);                  //Go to file start 
       int i=fread(sText,1,nFileLong,fp);     //Read the characters
       sText[i]=0;                            //Set string terminating null
       m_EDIT1=sText;                         //Put text in Edit box's variable
	   fprintf(file1,"%s\n",m_EDIT1);         //print the content of the editbox into the file 
       fclose(file1);                         //Close file2
	   fclose(fp);                            //Close file 
       UpdateData(FALSE);                     //Force data to go to Edit control
	   }
}

void CSecondDlg::OnButton2() 
{
	//**BROWSE DIALOG 2**//
	   FILE *fp;
	   FILE *file2 = fopen("file2.txt","w");   //Create txt file for saving editbox content
       int nFileLong;
	   //***************************************************//
       char strFilter[] = { "CPP Files (*.cpp)|*.cpp|All Files (*.*)|*.*||" };
       CFileDialog m_ldFile(TRUE, ".cpp", NULL, 0, strFilter);
       if (m_ldFile.DoModal() == IDOK)        //Start File dlg box
	   {
       m_sFileName=m_ldFile.GetPathName();    //Get file name
       fp=fopen(m_sFileName,"rb");            //Open file for reading
       fseek(fp,0,SEEK_END);                  //Go to file end 
       nFileLong=ftell(fp);                   //Get length
       char* sText = new char[nFileLong+1];   //reserve string space
       fseek(fp,0,SEEK_SET);                  //Go to file start 
       int i=fread(sText,1,nFileLong,fp);     //Read the characters
       sText[i]=0;                            //Set string terminating null
       m_EDIT2=sText;                         //Put text in Edit box's variable
	   fprintf(file2,"%s\n",m_EDIT2);         //print the content of the editbox into the file 
       fclose(fp);                            //Close file
	   fclose(file2);                         //Close file2
       UpdateData(FALSE);                     //Force data to go to Edit control
   }
}