MFC CWnd仿按钮
CBtn::CBtn()
{
RegisterWndClass();
}
bool CBtn::RegisterWndClass(void)
{
WNDCLASS n;
HINSTANCE hInst=AfxGetInstanceHandle();
if(GetClassInfo(hInst,"MyBtn",&n)==0)return true;//已经存在
n.style=CS_DBLCLKS;
n.cbClsExtra=0;
n.cbWndExtra=0;
n.hIcon=NULL;
n.hCursor=AfxGetApp()->LoadStandardCursor(IDC_ARROW);
n.hInstance=hInst;
n.lpszClassName="MyBtn";
n.lpszMenuName=NULL;
n.lpfnWndProc=::DefWindowProcA;
if(AfxRegisterClass(&n))
{
AfxThrowResourceException();
return false;
}
return true;
}
void CBtn::OnPaint()
{
CPaintDC dc(this); // device context for painting
// TODO: 在此处添加消息处理程序代码
// 不为绘图消息调用 CWnd::OnPaint()
DrawBtn(IDR_JPG1,"JPG");
}
void CBtn::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
DrawBtn(IDB_PNG1,"PNG");
CWnd::OnLButtonDown(nFlags, point);
}
void CBtn::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
DrawBtn(IDR_JPG1,"JPG");
int id=22222;////给父窗口发送项被单击消息
GetParent()->SendMessage(WM_COMMAND,MAKEWPARAM(id,0),LPARAM(this->GetSafeHwnd()));
CWnd::OnLButtonUp(nFlags, point);
}
BOOL CBtn::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
SetCursor(AfxGetApp()->LoadCursorA(IDC_CURSOR1));
return true;//CWnd::OnSetCursor(pWnd, nHitTest, message);
}
#include<atlimage.h>
bool CBtn::DrawBtn(int id, CString file)
{
CImage img;
HRSRC src=::FindResourceA(::AfxGetResourceHandle(),MAKEINTRESOURCE(id),file);
if(src==NULL)return false;
HGLOBAL data=::LoadResource(::AfxGetResourceHandle(),src);// 加载资源
if(data==NULL){::FreeResource(data);return false;}
LPVOID lp=::LockResource(data);// 锁定内存中的指定资源
LPSTREAM is;
DWORD size=::SizeofResource(::AfxGetResourceHandle(),src);
HGLOBAL hg=::GlobalAlloc(GHND,size);
LPBYTE by=(LPBYTE)::GlobalLock(hg);
::memcpy(by,lp,size);
::GlobalUnlock(hg);// 解除内存中的指定资源
HRESULT res=::CreateStreamOnHGlobal(hg,true,&is);// 从指定内存创建流对象
if(res!=S_OK)::GlobalFree(hg);
else {img.Load(is);::GlobalFree(hg);}
::FreeResource(data);// 释放资源
COLORREF ref=RGB(0,0,0);
if(img.GetBPP()==32)//确认该图像包含Alpha通道
{
for(int i=0;i<img.GetWidth();i++)
for(int j=0;j<img.GetHeight();j++)
{
LPBYTE by=(LPBYTE)img.GetPixelAddress(i,j);
by[0]=by[0]*by[3]/255;
by[1]=by[1]*by[3]/255;
by[2]=by[2]*by[3]/255;
}
ref=img.GetPixel(0,0);
}
CClientDC dc(this);
dc.SetStretchBltMode(3);//4
::SetBrushOrgEx(dc,0,0,NULL);
CRect rc;GetClientRect(&rc);
img.SetTransparentColor(ref);
img.Draw(dc.m_hDC,0,0,rc.Width(),rc.Height());
CString s="按钮";
CFont *font=dc.SelectObject(CFont::FromHandle((HFONT)GetStockObject(DEFAULT_GUI_FONT)));
dc.SetTextColor(RGB(255,0,0));
dc.SetBkMode(TRANSPARENT);
dc.DrawText(s,s.GetLength(),rc,DT_SINGLELINE|DT_VCENTER|DT_CENTER);
return true;
}
void CMyBtnDlg::OnBnClickedButton1()
{
b.Create(NULL,NULL,WS_VISIBLE|WS_CHILD,CRect(0,0,100,100),this,NULL,NULL);
}
#include<atlimage.h>
void CMyBtnDlg::OnMyBtn(void)
{
//AfxMessageBox("我的按钮事件");
CWnd *pwnd=CWnd::GetDesktopWindow();//屏幕
CWindowDC dc(pwnd);
CRect rc;
pwnd->GetWindowRect(&rc);
int pix=dc.GetDeviceCaps(BITSPIXEL)*dc.GetDeviceCaps(PLANES);
CImage img;
img.Create(rc.Width(),rc.Height(),pix);
CImageDC mdc(img);
::BitBlt(mdc,0,0,rc.Width(),rc.Height(),dc,0,0,SRCCOPY);
img.Save("C:\\j.jpg");
}