1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
#if !defined(_WIN32_WCE)
//------------------------------------------------------------------------------
// File: DibHelper.cpp
//
// Desc: DirectShow sample code - In-memory push mode source filter
// Helper routines for manipulating bitmaps.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
#include <windows.h>
#include "dsdibhelper.h"
HBITMAP CopyScreenToBitmap(LPRECT lpRect, BYTE *pData, BITMAPINFO *pHeader)
{
HDC hScrDC, hMemDC; // screen DC and memory DC
HBITMAP hBitmap, hOldBitmap; // handles to deice-dependent bitmaps
int nX, nY, nX2, nY2; // coordinates of rectangle to grab
int nWidth, nHeight; // DIB width and height
int xScrn, yScrn; // screen resolution
// check for an empty rectangle
if (IsRectEmpty(lpRect))
return NULL;
// create a DC for the screen and create
// a memory DC compatible to screen DC
hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
hMemDC = CreateCompatibleDC(hScrDC);
// get points of rectangle to grab
nX = lpRect->left;
nY = lpRect->top;
nX2 = lpRect->right;
nY2 = lpRect->bottom;
// get screen resolution
xScrn = GetDeviceCaps(hScrDC, HORZRES);
yScrn = GetDeviceCaps(hScrDC, VERTRES);
//make sure bitmap rectangle is visible
if (nX < 0)
nX = 0;
if (nY < 0)
nY = 0;
if (nX2 > xScrn)
nX2 = xScrn;
if (nY2 > yScrn)
nY2 = yScrn;
nWidth = nX2 - nX;
nHeight = nY2 - nY;
// create a bitmap compatible with the screen DC
hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);
// select new bitmap into memory DC
hOldBitmap = (HBITMAP) SelectObject(hMemDC, hBitmap);
// bitblt screen DC to memory DC
BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);
// select old bitmap back into memory DC and get handle to
// bitmap of the screen
hBitmap = (HBITMAP) SelectObject(hMemDC, hOldBitmap);
// Copy the bitmap data into the provided BYTE buffer
GetDIBits(hScrDC, hBitmap, 0, nHeight, pData, pHeader, DIB_RGB_COLORS);
// clean up
DeleteDC(hScrDC);
DeleteDC(hMemDC);
// return handle to the bitmap
return hBitmap;
}
#endif /* _WIN32_WCE */
|
