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wzjs 2025/8/10 6:08:44

有没有电脑做兼职的网站,国家免费技能培训平台,百度网页版下载,北京市保障房建设投资中心网站首页下载本应用本应用获取屏幕图像，保存到bmp，jpg，png图片。下面是应用的界面图像。应用的主要代码 C屏幕截图Dlg* pDlg (C屏幕截图Dlg*)pParam;//CRect rect;截图矩形，已指定大小CWnd* pDesktop pDlg->GetDesktopWindow();C…

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本应用获取屏幕图像，保存到bmp，jpg，png图片。下面是应用的界面图像。
在这里插入图片描述

应用的主要代码

	C屏幕截图Dlg* pDlg = (C屏幕截图Dlg*)pParam;//CRect rect;截图矩形，已指定大小CWnd* pDesktop = pDlg->GetDesktopWindow();CDC* pDesktopDC = pDesktop->GetDC();CDC mDC;mDC.CreateCompatibleDC(pDesktopDC);//创建兼容DCCBitmap bmp;bmp.CreateBitmap(rect.Width(), rect.Height(), 1, 32, NULL);//创建32位位图mDC.SelectObject(&bmp);mDC.BitBlt(0, 0, rect.Width(), rect.Height(), pDesktopDC, rect.left, rect.top, SRCCOPY);LONG len = rect.Width() * rect.Height() * 4;BYTE* lpData = (BYTE*)(LPVOID)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, len);//分配内存bmp.GetBitmapBits(len, lpData);//获取位图位mDC.DeleteDC();pDlg->ReleaseDC(pDesktopDC);pDlg->AutoBmp(lpData, rect.Width(), rect.Height());//创建bmp//pDlg->GBmp256(lpData, rect.Width(), rect.Height());//创建灰度bmp//pDlg->Jpg(lpData, rect.Width(), rect.Height());//创建jpg//pDlg->Png(lpData, rect.Width(), rect.Height());//创建pngGlobalFree(lpData);int AddTable(CArray<RGBQUAD, RGBQUAD>* pColorTable, RGBQUAD color)
{int Count = pColorTable->GetCount();for (int i = 0; i < Count; i++){RGBQUAD TableColor = pColorTable->GetAt(i);if (TableColor.rgbBlue == color.rgbBlue && TableColor.rgbGreen == color.rgbGreen && TableColor.rgbRed == color.rgbRed)return i;}pColorTable->Add(color);return Count;
}void C屏幕截图Dlg::AutoBmp(BYTE* pB, int w, int h)//首先尝试创建256色位图，如果颜色数量大于256，创建24位位图
{int ColorCount;int len;int Width = w;if (Width % 4)Width = Width / 4 * 4 + 4;//确保行的宽度是4的倍数len = Width * h;CArray<RGBQUAD, RGBQUAD> ColorTable;BYTE* p256B = new BYTE[len];BYTE* pS = NULL; BYTE* pD = NULL;for (int y = 0; y < h; y++){pS = pB + w * 4 * y;pD = p256B + Width * (h - y - 1);for (int x = 0; x < w; x++){RGBQUAD color = { pS[0], pS[1], pS[2],pS[3] };*pD = (BYTE)AddTable(&ColorTable, color);pS += 4; pD++;ColorCount = ColorTable.GetCount();if (ColorCount > 256){delete[] p256B;Bmp24(pB, w, h);//创建24位位图return;}}}BITMAPFILEHEADER Fhdr;//位图文件头Fhdr.bfType = ((WORD)('M' << 8) | 'B');Fhdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + 256 * 4 + len;//整个文件的大小Fhdr.bfReserved1 = 0;Fhdr.bfReserved2 = 0;Fhdr.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + 256 * 4;//从文件开头到图像数据的偏移量BITMAPINFOHEADER biHeader;//位图信息头ZeroMemory(&biHeader, sizeof(BITMAPINFOHEADER));biHeader.biSize = sizeof(BITMAPINFOHEADER);biHeader.biWidth = w;biHeader.biHeight = h;biHeader.biPlanes = 1;biHeader.biBitCount = 8;biHeader.biCompression = BI_RGB;biHeader.biSizeImage = len;biHeader.biClrUsed = 256;CFile F;F.Open(_T("截图.bmp"), CFile::modeCreate | CFile::modeWrite);F.Write(&Fhdr, sizeof(Fhdr));//写位图文件头F.Write(&biHeader, sizeof(biHeader));//写位图信息for (int i = 0; i < 256; i++)//写颜色表{RGBQUAD color;if (i < ColorCount){color = ColorTable.GetAt(i);}else{color.rgbBlue = 0; color.rgbGreen = 0; color.rgbRed = 0; color.rgbReserved = 0;}F.Write(&color, 4);}F.Write(p256B, len);//写图像数据F.Close();delete[] p256B;
}void C屏幕截图Dlg::GBmp256(BYTE* pB, int w, int h)//创建灰度位图
{int len;int Width = w;if (Width % 4)Width = Width / 4 * 4 + 4;//确保行的宽度是4的倍数len = Width * h;BYTE* p256B = new BYTE[len];BYTE* pS = NULL; BYTE* pD = NULL;for (int y = 0; y < h; y++){pS = pB + w * 4 * y;pD = p256B + Width * (h - y - 1);for (int x = 0; x < w; x++){*pD = (BYTE)(0.299 * pS[2] + 0.587 * pS[1] + 0.114 * pS[0]); //亮度值pS += 4; pD++;}}BITMAPFILEHEADER Fhdr;//位图文件头Fhdr.bfType = ((WORD)('M' << 8) | 'B');Fhdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + 256*4 + len;//整个文件的大小Fhdr.bfReserved1 = 0;Fhdr.bfReserved2 = 0;Fhdr.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + 256*4;//从文件开头到图像数据的偏移量BITMAPINFOHEADER biHeader;//位图信息头ZeroMemory(&biHeader, sizeof(BITMAPINFOHEADER));biHeader.biSize = sizeof(BITMAPINFOHEADER);biHeader.biWidth = w;biHeader.biHeight = h;biHeader.biPlanes = 1;biHeader.biBitCount = 8;biHeader.biCompression = BI_RGB;biHeader.biSizeImage = len;biHeader.biClrUsed = 256;CFile F;F.Open(_T("截图.bmp"), CFile::modeCreate | CFile::modeWrite);F.Write(&Fhdr, sizeof(Fhdr));//写位图文件头F.Write(&biHeader, sizeof(biHeader));//写位图信息BYTE zero = 0, val;for (int i = 0; i < 256; i++)//写颜色表{val = (BYTE)i;F.Write(&val, 1); F.Write(&val, 1); F.Write(&val, 1); F.Write(&zero, 1);}F.Write(p256B, len);//写图像数据F.Close();delete[] p256B;
}void C屏幕截图Dlg::Bmp24(BYTE* pB, int w, int h)//创建24位位图
{int bmWidthBytes = w * 3;if (bmWidthBytes % 4)bmWidthBytes = bmWidthBytes / 4 * 4 + 4;//确保行的宽度是4的倍数int len = bmWidthBytes * h;BYTE* p24B = new BYTE[len];int i = 0;for (int y = 0; y < h; y++){int j = bmWidthBytes * (h - y - 1);for (int x = 0; x < w; x++){p24B[j] = pB[i];  p24B[j + 1] = pB[i + 1]; p24B[j + 2] = pB[i + 2]; i += 4; j += 3;}}BITMAPFILEHEADER Fhdr;//位图文件头Fhdr.bfType = ((WORD)('M' << 8) | 'B');Fhdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + len;//整个文件的大小Fhdr.bfReserved1 = 0;Fhdr.bfReserved2 = 0;Fhdr.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);//从文件开头到图像数据的偏移量BITMAPINFOHEADER biHeader;//位图信息头ZeroMemory(&biHeader, sizeof(BITMAPINFOHEADER));biHeader.biSize = sizeof(BITMAPINFOHEADER);biHeader.biWidth = w;biHeader.biHeight = h;biHeader.biPlanes = 1;biHeader.biBitCount = 24;biHeader.biCompression = BI_RGB;CFile F;F.Open(_T("截图.bmp"), CFile::modeCreate | CFile::modeWrite);F.Write(&Fhdr, sizeof(Fhdr));//写位图文件头F.Write(&biHeader, sizeof(biHeader));//写位图信息F.Write(p24B, len);//写图像数据F.Close();delete[] p24B;
}void C屏幕截图Dlg::Jpg(BYTE* pB, int w, int h)
{CBitmap bmp;bmp.CreateBitmap(w, h, 1, 32, pB);CImage image;image.Attach((HBITMAP)bmp);image.Save(L"截图.jpg", Gdiplus::ImageFormatJPEG);
}void C屏幕截图Dlg::Png(BYTE* pB, int w, int h)
{CBitmap bmp;bmp.CreateBitmap(w, h, 1, 32, pB);CImage image;image.Attach((HBITMAP)bmp);image.Save(L"截图.png", Gdiplus::ImageFormatPNG);
}