GETBMP function function

GETBMP function

Purpose: Captures portion of screen to a bmp and stores it in an HDC.

Syntax:


 hDCBmp = GETBMP(LeftSrc%, TopSrc%, WidthSrc%, HeightSrc%, hWnd)

Parameters:

LeftSrc% Horizontal X-coordinate of area to be copied.
TopSrc% Vertical Y-coordinate of area to be copied.
WidthSrc% Width of area to be copied.
Height% Height of area to be copied.
hWnd Handle to window containing area to be copied.

Return Value:

hDCBmp, the return value, is a HDC (Handle to Device Context) of Bitmap

SAVEBMP function

Purpose: Saves a bmp, stored in an HDC or accessible through a HBITMAP, to a file. Use the GETBMP function to store a bitmap in a HDC.

Syntax:


 SAVEBMP(hDCBmp, FileName$)

Parameters:

hDCBmp is a Handle to Device Context (HDC) or the bitmap handle (HBITMAP) of the bitmap to be saved.
FileName$ Name of file to which bitmap is to be saved.

Example: Note the use of ONENTRY and ONEXIT metafunctions.


 ' ****************************************************************
 '  GetBmp SaveBmp Demo by Robert Wishlaw 2002/05/28
 ' ****************************************************************
 '  Paste this example into an editor and save as GetSaveBmp.bas
 '  BC GetSaveBmp will translate, compile and run the program
 ' ****************************************************************
  
 $COMPILER "$PELLES$\Bin\pocc -W1 -Gd -Go -Ze -Zx -Tx86-coff $FILE$.c"
 
 $LINKER   "$PELLES$\Bin\polink -release _
                           -machine:ix86 _
                      -subsystem:windows _
                         -OUT:$FILE$.exe _
                              $FILE$.obj"

 $ONEXIT   "GetSaveBmp"
 
 GUI  "GetBmp-SaveBmp"
 
 DIM Form1   AS CONTROL
 DIM Button3 AS CONTROL
 DIM Button4 AS CONTROL
 DIM Button5 AS CONTROL
 DIM Rich1   AS CONTROL
 DIM Stat1   AS CONTROL
 DIM Buffer$
 DIM Rect    AS RECT
 DIM HDCBmp  AS HDC
 DIM hwnd    AS HANDLE
 DIM retval
 DIM str1$
 CONST RunEx(lpFile, lpParameters, nShowCmd) = _
             ShellExecute(0, "open", lpFile, lpParameters, 0, nShowCmd)
 
 SUB FORMLOAD
   CALL LoadBuffer1()
   '******************************************************************
   Form1   = BCX_FORM    ("GetBmp SaveBmp" ,            0, 0,200,110)
   Button3 = BCX_BUTTON  ("Capture Client" ,Form1,101,  5,10, 50, 15)
   Button4 = BCX_BUTTON  ("Capture Portion",Form1,102, 55,10, 50, 15)
   Button5 = BCX_BUTTON  ("Capture Screen" ,Form1,103,105,10, 50, 15)
   Rich1   = BCX_RICHEDIT(   Buffer$       ,Form1,104,  5,30,190, 60)
   Stat1   = BCX_STATUS  (    "Ready"      ,Form1)
   '*******************************************************************
   SendMessage(Rich1,EM_SETBKGNDCOLOR,0,0x00f3f3f3) ' Set background color
   CENTER(Form1)                           ' Center it!
   SHOW (Form1)                           ' Show it!
 END SUB
 
 BEGIN EVENTS
   SELECT CASE CBMSG
     '**********************
   CASE WM_COMMAND
     '**********************
  
     IF CBCTL = 101 THEN
       ' Capture Client area of a window
       GetClientRect(Rich1, &Rect)
       HDCBmp = GETBMP(Rect.left, Rect.top, _
                    Rect.right - Rect.left, _
                    Rect.bottom - Rect.top, _
                                     Rich1)
       SAVEBMP(HDCBmp, "richedit.bmp")
       'IMPORTANT ! Release device context resources back to system.
       retval = DeleteDC(HDCBmp)
       str1$ = "richedit.bmp"
       RunEx(str1$, "" , 1) ' Start default paint app
     END IF
 
     IF CBCTL = 102 THEN
       'Capture User defined area of a window
       HDCBmp = GETBMP(10, 58, 360, 54, Rich1)
       SAVEBMP(HDCBmp, "richedit.bmp")
       'IMPORTANT ! Release device context resources back to system.
       retval = DeleteDC(HDCBmp)
       str1$ = "richedit.bmp"
       RunEx(str1$, "" , 1) ' Start default paint app
     END IF
 
     IF CBCTL = 103 THEN
       ' Capture screen. NULL is HDC for screen
       hwnd = GetDesktopWindow()
       HDCBmp = GETBMP(0, 0, 300, 200, hwnd)
       SAVEBMP(HDCBmp, "richedit.bmp")
       'IMPORTANT ! Release device context resources back to system.
       retval = DeleteDC(HDCBmp)
       str1$ = "richedit.bmp"
       RunEx(str1$, "", 1) ' Start default paint app
     END IF
 
     EXIT FUNCTION
 
     '**********************
   CASE WM_CLOSE
     '**********************
     IF MSGBOX("Are you sure?", "Quit Program!", MB_YESNO) = IDYES THEN
       DestroyWindow(Form1)
     END IF
     EXIT FUNCTION
   END SELECT
 END EVENTS
 
 
 SUB LoadBuffer1()
   Buffer$ = ""
   Buffer$ = Buffer$ & "{\rtf1\ansi\ansicpg1252\deff0\deflang1033"
   Buffer$ = Buffer$ & "{\fonttbl"
   Buffer$ = Buffer$ & "{\f0\froman Times New Roman;}"
   Buffer$ = Buffer$ & "{\f1\fmodern Lucida Console;}"
   Buffer$ = Buffer$ & "{\f2\fswiss Arial;}"
   Buffer$ = Buffer$ & "}"
   Buffer$ = Buffer$ & "{\colortbl ;"
   Buffer$ = Buffer$ & "\red192\green000\blue000;"
   Buffer$ = Buffer$ & "\red000\green000\blue160;"
   Buffer$ = Buffer$ & "\red255\green255\blue255;"
   Buffer$ = Buffer$ & "}\qc"
   Buffer$ = Buffer$ & "\f0\fs72\cf1\b\i BCX \i0\b0\par"
   Buffer$ = Buffer$ & "\f0\fs64\cf2 GetBmp SaveBmp"
   Buffer$ = Buffer$ & "}"
 END SUB