是不是在模式对话框的调用中出现的问题，并不是很简单呀

[woaini5994]

在主主界面上有一个按钮，点击之后会弹出一个对话框，
我在这个弹出的对话框中简单的处理一下，想让其只显示一朵玫瑰，但是就是实现不了，代码绝对
没有问题，因为在主界面当中按照这段代码，就可以实现但是在这个弹出的对话框中
就是是实现不了，实在是没有办法了，帮我看看吧
我觉得是在调用模式对话框的时候，MFC在处理方面有点问题，但是还找不出来
问题在什么地方。
BOOL zzy::OnInitDialog()
{
CDialog::OnInitDialog();
m_bmBitmap = new CBitmap;
m_bmBitmap->LoadBitmap(IDB_BITMAP1);
// TODO: Add extra initialization here
CRect rcWnd;
GetWindowRect (rcWnd);

CRgn rgn;
rgn.CreateRectRgn (rcWnd.left, rcWnd.top, rcWnd.right, rcWnd.bottom);

CRect rcClient;
GetClientRect (rcClient);
ClientToScreen (rcClient);

CRgn rgnClient;
rgnClient.CreateRectRgn (rcClient.left, rcClient.top, rcClient.right,
rcClient.bottom);

// Subtract rgnClient from rgn
rgn.CombineRgn (&rgn, &rgnClient, RGN_XOR);

// Get a DC for the bitmap
CDC dcImage;
dcImage.CreateCompatibleDC (NULL);
CBitmap *pOldBitmap = dcImage.SelectObject (m_bmBitmap);

// Get the bitmap for width and height information
BITMAP bm;
m_bmBitmap->GetBitmap (&bm);

// Get window width and height
CRect rc;
GetClientRect (rc);

// Use the minimum width and height
int width = min (bm.bmWidth, rc.Width());
int height = min (bm.bmHeight, rc.Height());

// Use RLE (run-length) style because it goes faster.
// Row start is where the first opaque pixel is found. Once
// a transparent pixel is found, a line region is created.
// Then row_start becomes the next opaque pixel.
int row_start;

// Go through all rows
for (int y=0; y<height; y++)
{
// Start looking at the beginning
row_start = 0;

// Go through all columns
for (int x=0; x<width; x++)
{
// If this pixel is transparent
if (dcImage.GetPixel(x, y)==RGB(0,0,0))
{
// If we haven't found an opaque pixel yet, keep searching
if (row_start == x) row_start ++;
else
{
// We have found the start (row_start) and end (x) of
// an opaque line. Add it to the region.
CRgn rgnAdd;
rgnAdd.CreateRectRgn (rcClient.left+row_start,
rcClient.top+y, rcClient.left+x, rcClient.top+y+1);
rgn.CombineRgn (&rgn, &rgnAdd, RGN_OR);
row_start = x+1;
}
}
}

// If the last pixel is still opaque, make a region.
if (row_start != x)
{
CRgn rgnAdd;
rgnAdd.CreateRectRgn (rcClient.left+row_start, rcClient.top+y,
rcClient.left+x, rcClient.top+y+1);
rgn.CombineRgn (&rgn, &rgnAdd, RGN_OR);
}
}

SetWindowRgn (rgn, TRUE);

return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}

void zzy::OnPaint()
{
CPaintDC dc(this); // device context for painting
CRect rc;
GetClientRect (rc);

// Get a DC for the bitmap
CDC dcImage;
dcImage.CreateCompatibleDC (&dc);
CBitmap *pOldBitmap = dcImage.SelectObject (m_bmBitmap);

// Get bitmap width and height
BITMAP bm;
m_bmBitmap->GetBitmap (&bm);

// Use the minimum width and height
int width = min (bm.bmWidth, rc.Width());
int height = min (bm.bmHeight, rc.Height());
// Draw the bitmap as the window background
dc.BitBlt (0, 0, rc.Width(), rc.Height(), &dcImage, 0, 0, SRCCOPY);
// TODO: Add your message handler code here

[awant2k]

把 OnInitDialog() 中 m_bmBitmap->LoadBitmap(IDB_BITMAP1);
后面的代码移到 OnPaint() 再综合处理吧

[panzhaoping]

在MFC中已经不大区别模态和非模态的对话框了。

[woaini5994]

感谢上面的朋友
我的目的是在一个对话框上显示一个位图，但是，是只显示图象的部分，其余的部分不要
比方说 如果一个图象上有一个鸭子，就只显示鸭子其余的部分不要，在图象当中除了鸭子以外，其余的都是黑色的

[woaini5994]

在up

[blue2moon]

对话框中画图，为什么不把它放到OnPaint中！

[woaini5994]

在OnPaint我已经作出了位图显示的处理
而且用上面的代码，在主界面当中都好用
但是在调用的对话框中就不好用了，谁可以说的在具体一些
在调用对话框的初始化中是把黑色的部分祛除，并没有在初始化的函数中进行显示

[woaini5994]

up

[vcforever]

应该是窗口重画的问题，你可以上楼上的说的那样，将代码放到OnPaint()函数中去！
我想你的要求应该可以实现！

祝你成功！

[findcsdn]

楼主处理好大一段，我没看懂，就写了一个从资源中显示图片的，不知道是否有帮助。

void CAboutDlg::OnPaint()
{
CPaintDC dc(this); // device context for painting

// TODO: Add your message handler code here
CBitmap m_bmp;
CRect rec;
CDC dc2;

CDC* dc1 = GetDC();
GetClientRect(&rec);
m_bmp.LoadBitmap("IDB_BITMAP1");

dc2.CreateCompatibleDC(dc1);
dc2.SelectObject(m_bmp);

dc1->BitBlt(0, 0, rec.right, rec.bottom, &dc2, 0, 0, SRCCOPY);
}

[woaini5994]

上面的难道不需要
CRGN这个类么？

[findcsdn]

void CAboutDlg::OnPaint()
{
CPaintDC dc(this); // device context for painting
static bool Mark = true;

if (Mark)
{
Mark = false;
CBitmap m_bmp;
BITMAP bm;

CDC dc2, dc3;
COLORREF pt;

m_bmp.LoadBitmap("IDB_BITMAP1");
m_bmp.GetBitmap(&bm);

m_menbmp.CreateCompatibleBitmap(&dc, bm.bmWidth, bm.bmHeight);

dc2.CreateCompatibleDC(&dc);
dc2.SelectObject(m_bmp);

dc3.CreateCompatibleDC(&dc);
dc3.SelectObject(m_menbmp);

for (int i = 0; i < bm.bmWidth; i++)
for (int j = 0; j < bm.bmHeight; j++)
{
pt = dc2.GetPixel(i, j);
if(pt != RGB(0,0,0))
{
dc.SetPixel(i, j, pt);
}
};
dc3.BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &dc, 0, 0, SRCCOPY);
}

CDC dc1;
CRect rec;
this->GetClientRect(&rec);
dc1.CreateCompatibleDC(&dc);
dc1.SelectObject(m_menbmp);
dc.BitBlt(0, 0, rec.right, rec.bottom, &dc1, 0, 0, SRCCOPY);

// TODO: Add your message handler code here
}

[findcsdn]

增加一个成员

private:
CBitmap m_menbmp;