用按钮打开对话框选取图片按大小显示在控件中

2023-12-02 15:26:34

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打开按钮相应消息

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void CLoadBmpDlg::OnBtnOpenBmp()
{
// TODO: Add your control notification handler code here
////选取图片文件

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CFileDialog file_open_dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY,"BMP Files(*.bmp)|*.bmp|All Files(*.*)|*.*||");
if(file_open_dlg.DoModal() != IDOK)
{
return;
}
m_pFilePath = file_open_dlg.GetPathName();
// ((CStatic*)GetDlgItem(IDC_STC_BMP))->SetBitmap(::LoadBitmap(AfxGetResourceHandle(), MAKEINTRESOURCE(IDB_BITMAP)));
// HBITMAP hsource = (HBITMAP)LoadImage(AfxGetInstanceHandle(), m_pFilePath, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
// HBITMAP hbmp = ((CStatic*)GetDlgItem(IDC_STC_BMP))-> SetBitmap(hsource);
Invalidate( FALSE );
}

///OnPaint函数

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void CLoadBmpDlg::OnPaint()

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{

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1. //////////////////////////////////////////////////////////////
2. CPaintDC bmpDC(GetDlgItem( IDC_STC_BMP ));
3. CBitmap SourceImage;
4. HBITMAP OldBitmap;
5. CDC mDC;
6. // SourceImage.LoadBitmap(image_name);
7. HANDLE filehandle = (HBITMAP)LoadImage( NULL, m_pFilePath, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE );
8. if ( filehandle != NULL )
9. {
10. BITMAP bmpInfo;
11. SourceImage.Attach( filehandle );
12. SourceImage.GetBitmap( &bmpInfo );
13. CDC dcCompatible;
14. dcCompatible.CreateCompatibleDC(&bmpDC);
15. OldBitmap = (HBITMAP)dcCompatible.SelectObject(&SourceImage);
16. CRect rec;
17. ((CStatic *)GetDlgItem(IDC_STC_BMP))->GetClientRect(&rec);
18. // dc.BitBlt(rec.left, rec.top, rec.Width(), rec.Height(), &dcCompatible, 0, 0, SRCCOPY);
19. int n = bmpDC.StretchBlt(rec.left, rec.top, rec.Width(), rec.Height(), &dcCompatible, rec.left, rec.top, bmpInfo.bmWidth, bmpInfo.bmHeight, SRCCOPY);
20. //
21. // CBrush brush;
22. // brush.CreatePatternBrush(&SourceImage);
23. // bmpDC.FillRect(rec, &brush);
24. // bmpDC.StretchBlt(rec.left, rec.top, rec.Width(), rec.Height(), &dcCompatible, rec.left, rec.top, bmpInfo.bmWidth, bmpInfo.bmHeight, SRCCOPY);
25. // brush.DeleteObject();
26. dcCompatible.SelectObject(&OldBitmap);
27. SourceImage.Detach();
28. }
29. }