效果截图:
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这次显示的是QQ空间的登陆验证码,关键代码如下:
//下载验证码线程 void CShowVertificationCodeDlg::ThreadDownVertificationCode() { CString msg; wchar_t *szURL=L"http://captcha.qq.com/getimage?uin=407583721&aid=549000912&cap_cd=4r8HnDflIm8m_Zb-flCA7MvXQ39gU3Hq&0.8621867699548602"; wchar_t szFileName[]=L"D:\\vertificationcode.bmp"; //WIN7 64下载到C盘会失败,没权限??? DeleteFile(szFileName); DeleteUrlCacheEntry(szURL); //记得清理IE缓存,不然每次获取到的都是同一张图片 HRESULT retVal=URLDownloadToFile(NULL,szURL,szFileName,0,NULL); if(S_OK!=retVal) { msg.Format(_T("下载失败:GetLastError()=%d \n"),GetLastError()); OutputDebugString(msg); return; } msg.Format(_T("下载完毕:GetLastError()=%d \n"),GetLastError()); OutputDebugString(msg); CImage imgVer; retVal=imgVer.Load(szFileName); if(S_OK!=retVal) { return; } CDC *pDc=m_imgVertificationCodeCtrl.GetDC(); if (NULL==pDc) { msg.Format(_T("获取图片框DC失败:GetLastError()=%d \n"),GetLastError()); OutputDebugString(msg); return; } CRect rc; m_imgVertificationCodeCtrl.GetClientRect(&rc); ::SetStretchBltMode(pDc->m_hDC, HALFTONE); //如果不设置这两个函数图片就会变色 ::SetBrushOrgEx(pDc->m_hDC, 0, 0, NULL); //图片太大会造成色彩失调,用0,0代替rc会很清晰 imgVer.Draw(pDc->m_hDC,rc); ReleaseDC(pDc); }
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VS2010工程下载:
VC显示QQ空间登录验证码.zip
http://download.csdn.net/detail/friendan/7618129
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您的十分满意是我追求的宗旨。
您的一点建议是我后续的动力。