zhipuzi_pay_plugin/zhipuzi_pay_plugin/helper/CBitmapHelper.cpp

#include "CBitmapHelper.h"

#include "../pch/pch.h"

CBitmapHelper::CBitmapHelper()
{
}


CBitmapHelper::~CBitmapHelper()
{
}

int CBitmapHelper::SaveBitmapToFile(HBITMAP  hBitmap, LPCWSTR  lpFileName)   //hBitmap   为刚才的屏幕位图句柄
{
    //lpFileName   为位图文件名
    WORD   wBitCount;   //位图中每个像素所占字节数

    //定义调色板大小，位图中像素字节大小，位图文件大小，写入文件字节数
    DWORD   dwPaletteSize = 0, dwBmBitsSize, dwDIBSize, dwWritten;
    BITMAP   Bitmap; //位图属性结构
    BITMAPFILEHEADER   bmfHdr;   //位图文件头结构
    BITMAPINFOHEADER   bi;   //位图信息头结构
    HANDLE   fh;   //定义文件，分配内存句柄，调色板句柄
    LPSTR   lpbk, lpmem;

    wBitCount = 32;
    //设置位图信息头结构
    GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
    bi.biSize = sizeof(BITMAPINFOHEADER);
    bi.biWidth = Bitmap.bmWidth;
    bi.biHeight = Bitmap.bmHeight; //为负,正向的位图;为正,倒向的位图
    bi.biPlanes = 1;
    bi.biBitCount = wBitCount;
    bi.biCompression = BI_RGB;
    bi.biSizeImage = 0;
    bi.biXPelsPerMeter = 0;
    bi.biYPelsPerMeter = 0;
    bi.biClrUsed = 0;
    bi.biClrImportant = 0;
    dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;

    //创建位图文件
    fh = CreateFile(lpFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
                    FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
    if(fh == INVALID_HANDLE_VALUE)
    {
        return   FALSE;
    }

    //设置位图文件头
    bmfHdr.bfType = 0x4D42;   //   "BM"
    dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwBmBitsSize;
    bmfHdr.bfSize = dwDIBSize;
    bmfHdr.bfReserved1 = 0;
    bmfHdr.bfReserved2 = 0;
    bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER);

    //写入位图文件头
    WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);

    //写入位图信息头
    WriteFile(fh, (LPSTR)&bi, sizeof(BITMAPINFOHEADER), &dwWritten, NULL);

    //获取位图阵列
    lpmem = new   char[dwBmBitsSize];
    lpbk = (LPSTR)   new   char[dwBmBitsSize];
    GetBitmapBits(hBitmap, dwBmBitsSize, lpmem);//正向的内存图象数据

    //转化为倒向数据(仅在bmHeight为正时需要)
    for(int i = 0; i < Bitmap.bmHeight; i++)
    {
        memcpy(lpbk + Bitmap.bmWidth * i * 4, lpmem + Bitmap.bmWidth * (Bitmap.bmHeight - i - 1) * 4, Bitmap.bmWidth * 4);
    }

    //写位图数据
    WriteFile(fh, lpbk, dwBmBitsSize, &dwWritten, NULL);

    //清除
    delete[]lpbk;
    delete[]lpmem;

    CloseHandle(fh);
    return   TRUE;

}

HBITMAP CBitmapHelper::Scale(HBITMAP srcBitmap, int MaxWidth, int MaxHeight)
{
    BITMAP  Bitmap;

    GetObject(srcBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);

    int srcWidth = Bitmap.bmWidth;
    int srcHeight = Bitmap.bmHeight;

    double scaleX = (double)srcWidth / MaxWidth;
    double scaleY = (double)srcHeight / MaxHeight;

    double realScale;
    if(scaleX > scaleY)
    {
        realScale = scaleX;
    }
    else
    {
        realScale = scaleY;
    }

    int newWidth = (int)(srcWidth / realScale);
    int newHeight = (int)(srcHeight / realScale);

    HDC hSrcDC = ::CreateCompatibleDC(NULL);
    SelectObject(hSrcDC, srcBitmap);

    HDC hMemDC = CreateCompatibleDC(hSrcDC);

    //创建一个与屏幕设备描述表兼容的位图
    HBITMAP hNewBitmap = CreateCompatibleBitmap(hSrcDC, newWidth, newHeight);

    //把新位图选到内存设备描述表中
    HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, hNewBitmap);

    ::StretchBlt(hMemDC, 0, 0, newWidth, newHeight, hSrcDC, 0, 0, srcWidth, srcHeight, SRCCOPY);

    hNewBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);

    return hNewBitmap;
}

HBITMAP CBitmapHelper::CopyScreenToBitmap(LPRECT lpRect)   //lpRect   代表选定区域
{
    HDC   hScrDC, hMemDC; //屏幕和内存设备描述表
    HBITMAP   hBitmap, hOldBitmap;//位图句柄
    int   nX, nY, nX2, nY2; //选定区域坐标
    int   nWidth, nHeight; //位图宽度和高度
    int   xScrn, yScrn; //屏幕宽度和高度

    //确保选定区域不为空矩形
    if(IsRectEmpty(lpRect))
    {
        return   NULL;
    }

    //为屏幕创建设备描述表
    hScrDC = CreateDC(L"DISPLAY", NULL, NULL, NULL);

    //为屏幕设备描述表创建兼容的内存设备描述表
    hMemDC = CreateCompatibleDC(hScrDC);   //或者::CreateCompatibleDC(NULL)

    //获得选定区域坐标
    nX = lpRect->left;
    nY = lpRect->top;
    nX2 = lpRect->right;
    nY2 = lpRect->bottom;

    //获得屏幕宽度和高度
    xScrn = GetDeviceCaps(hScrDC, HORZRES);
    yScrn = GetDeviceCaps(hScrDC, VERTRES);

    //确保选定区域是可见的
    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;

    //创建一个与屏幕设备描述表兼容的位图
    hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);

    //把新位图选到内存设备描述表中
    hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

    //把屏幕设备描述表拷贝到内存设备描述表中
    BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);

    //得到屏幕位图的句柄
    hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);

    //清除
    DeleteDC(hScrDC);
    DeleteDC(hMemDC);

    return hBitmap;   //返回位图句柄
}

bool CBitmapHelper::OcrRect(tesseract::TessBaseAPI& tess, LPRECT lpRect, std::string& result)
{
    HDC   hScrDC, hMemDC; //屏幕和内存设备描述表
    HBITMAP   hBitmap, hOldBitmap;//位图句柄
    int   nX, nY, nX2, nY2; //选定区域坐标
    int   nWidth, nHeight; //位图宽度和高度
    int   xScrn, yScrn; //屏幕宽度和高度

    //确保选定区域不为空矩形
    if(IsRectEmpty(lpRect))
    {
        return  false;
    }

    //为屏幕创建设备描述表
    hScrDC = CreateDC(L"DISPLAY", NULL, NULL, NULL);

    //为屏幕设备描述表创建兼容的内存设备描述表
    hMemDC = CreateCompatibleDC(hScrDC);   //或者::CreateCompatibleDC(NULL)

    //获得选定区域坐标
    nX = lpRect->left;
    nY = lpRect->top;
    nX2 = lpRect->right;
    nY2 = lpRect->bottom;

    //获得屏幕宽度和高度
    xScrn = GetDeviceCaps(hScrDC, HORZRES);
    yScrn = GetDeviceCaps(hScrDC, VERTRES);

    //确保选定区域是可见的
    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;

    //创建一个与屏幕设备描述表兼容的位图
    hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);

    //把新位图选到内存设备描述表中
    hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

    BITMAP bm;
    GetObject(hBitmap, sizeof(BITMAP), &bm);

    BITMAPINFOHEADER bi = { 0 };
    bi.biSize = sizeof(BITMAPINFOHEADER);
    bi.biWidth = bm.bmWidth;
    bi.biHeight = bm.bmHeight;
    bi.biPlanes = bm.bmPlanes;
    bi.biBitCount = bm.bmBitsPixel;
    bi.biCompression = BI_RGB;
    bi.biSizeImage = bm.bmHeight * bm.bmWidthBytes;

    //把屏幕设备描述表拷贝到内存设备描述表中
    BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);

    char* lpmem = new   char[bi.biSizeImage];

    //正向的内存图象数据
    GetBitmapBits(hBitmap, bi.biSizeImage, lpmem);

    //清除
    DeleteDC(hScrDC);
    DeleteDC(hMemDC);

    //开始测试ocr
    tess.SetImage((const unsigned char*)lpmem, bm.bmWidth, bm.bmHeight, 4, bm.bmWidthBytes);
    tess.Recognize(0);

    result = tess.GetUTF8Text();

    delete[] lpmem;
    tess.Clear();

    return true;
}