MFC 中创建并显示二维码

最新推荐文章于 2025-10-07 11:36:53 发布

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最新推荐文章于 2025-10-07 11:36:53 发布 · 875 阅读

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CC 4.0 BY-SA版权

文章标签：

#mfc #c++

文章介绍了如何使用QRcode库创建二维码，包括编码字符串、绘制到位图、以及将位图保存为图像文件的过程。作者详细展示了从编码到图像输出的完整步骤。

1.创建并显示

QRcode* pQR_Encode;

   pQR_Encode = QRcode_encodeString("12345678901234567890", 0, QR_ECLEVEL_H, QR_MODE_8, 1);
   if (pQR_Encode)
   {
       int nBmpWidth = pQR_Encode->width;

       //获取控件的边界大小
       CRect rect;
       GetDlgItem(IDC_PIC)->GetClientRect(&rect);
       CStatic* pic =(CStatic * )GetDlgItem(IDC_PIC);

       //定义并创建一个内存设备环境DC
       CDC* pCurCDC = GetDlgItem(IDC_PIC)->GetDC();
       //CDC *pCurCDC = GetDC();
       //创建兼容性的DC
       CDC* pWorkDC = new CDC;

       pWorkDC->CreateCompatibleDC(pCurCDC);
       //pWorkDC->CreateCompatibleDC(NULL);

CBitmap workBitmap;

CBitmap backBitmap;

CDC* pBackDC = new CDC;

pBackDC->CreateCompatibleDC(pCurCDC);

//workBitmap.CreateCompatibleBitmap(pWorkDC, nBmpWidth, nBmpWidth);

workBitmap.CreateCompatibleBitmap(pWorkDC, rect.Width(), rect.Height());

backBitmap.CreateCompatibleBitmap(pBackDC, rect.Width(), rect.Height());

CBitmap* pOldBitmap = pWorkDC->SelectObject(&workBitmap);//将位图选入临时内存设备环境

CBitmap* pbackBitmap = pBackDC->SelectObject(&backBitmap);

       // 背景全部画成白色
       pWorkDC->PatBlt(0, 0, nBmpWidth, nBmpWidth, WHITENESS);
   //   pBackDC->PatBlt(0, 0, nBmpWidth, nBmpWidth, WHITENESS);

// 根据二维码内容绘制位图
unsigned char* pSourceData = pQR_Encode->data;

for (