基于Dialog的应用程序，添加水平与垂直滚动条

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原创最新推荐文章于 2026-03-09 05:22:00 发布 3.9k 阅读 AI 写同款· GEO 优化 ›

MFC实现picture_control读取大图具体实现（采用滚动条方式）问题描述：近期项目中需要处理的图片过大，采用传统的贴图方式显示再图片控件中会出现失真的情况，所以想要图片整个显示再控件中不产生失真的情况。首先要梳理一下主要的逻辑流程，图片控件内部显示的逻辑是怎么样的？图1 图 2 图1是图片的四个角的坐标样图，图2是图片控件的坐标样图，他们是独立的坐标所以需要在代码中分别获取到他俩的宽高来确定显示的部位以达到滚动图像的效果。首先打开VS2017->文件->新建->项目->MFC应用程序在资源视图中找到DIALOG,添加button按钮阅读详情

void CMy8900RODDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) { // TODO: Add your message handler code here and/or call default SCROLLINFO scrollinfo; GetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); switch (nSBCode) { case SB_LEFT: ScrollWindow((scrollinfo.nPos-scrollinfo.nMin)*10,0); scrollinfo.nPos = scrollinfo.nMin; SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); break; case SB_RIGHT: ScrollWindow((scrollinfo.nPos-scrollinfo.nMax)*10,0); scrollinfo.nPos = scrollinfo.nMax; SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); break; case SB_LINELEFT: scrollinfo.nPos -= 1; if (scrollinfo.nPos<scrollinfo.nMin) { scrollinfo.nPos = scrollinfo.nMin; break; } SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); ScrollWindow(10,0); break; case SB_LINERIGHT: scrollinfo.nPos += 1; if (scrollinfo.nPos>scrollinfo.nMax) { scrollinfo.nPos = scrollinfo.nMax; break; } SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); ScrollWindow(-10,0); break; case SB_PAGELEFT: scrollinfo.nPos -= 5; if (scrollinfo.nPos<scrollinfo.nMin) { scrollinfo.nPos = scrollinfo.nMin; break; } SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); ScrollWindow(10*5,0); break; case SB_PAGERIGHT: scrollinfo.nPos += 5; if (scrollinfo.nPos>scrollinfo.nMax) { scrollinfo.nPos = scrollinfo.nMax; break; } SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); ScrollWindow(-10*5,0); break; case SB_THUMBPOSITION: break; case SB_THUMBTRACK: ScrollWindow((scrollinfo.nPos-nPos)*10,0); scrollinfo.nPos = nPos; SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); break; case SB_ENDSCROLL: break; } CDialog::OnHScroll(nSBCode, nPos, pScrollBar); }

void CMy8900RODDlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) { // TODO: Add your message handler code here and/or call default SCROLLINFO scrollinfo; GetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); switch (nSBCode) { case SB_BOTTOM: ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMax)*10); scrollinfo.nPos = scrollinfo.nMax; SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); break; case SB_TOP: ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMin)*10); scrollinfo.nPos = scrollinfo.nMin; SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); break; case SB_LINEUP: scrollinfo.nPos -= 1; if (scrollinfo.nPos<scrollinfo.nMin) { scrollinfo.nPos = scrollinfo.nMin; break; } SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); ScrollWindow(0,10); break; case SB_LINEDOWN: scrollinfo.nPos += 1; if (scrollinfo.nPos>scrollinfo.nMax) { scrollinfo.nPos = scrollinfo.nMax; break; } SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); ScrollWindow(0,-10); break; case SB_PAGEUP: scrollinfo.nPos -= 5; if (scrollinfo.nPos<scrollinfo.nMin) { scrollinfo.nPos = scrollinfo.nMin; break; } SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); ScrollWindow(0,10*5); break; case SB_PAGEDOWN: scrollinfo.nPos += 5; if (scrollinfo.nPos>scrollinfo.nMax) { scrollinfo.nPos = scrollinfo.nMax; break; } SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); ScrollWindow(0,-10*5); break; case SB_ENDSCROLL: // MessageBox("SB_ENDSCROLL"); break; case SB_THUMBPOSITION: // ScrollWindow(0,(scrollinfo.nPos-nPos)*10); // scrollinfo.nPos = nPos; // SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); break; case SB_THUMBTRACK: ScrollWindow(0,(scrollinfo.nPos-nPos)*10); scrollinfo.nPos = nPos; SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); break; } CDialog::OnVScroll(nSBCode, nPos, pScrollBar); }

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