}
void CCaptureDlg::OnCancel()
{
if(bTray)
DeleteIcon();
CDialog::OnCancel();
}
void CCaptureDlg::OnAbout()
{
CAboutDlg dlg;
dlg.DoModal();
}
void CCaptureDlg::OnBrowse()
{
CString str;
BROWSEINFO bi;
char name[MAX_PATH];
ZeroMemory(&bi,sizeof(BROWSEINFO));
bi.hwndOwner=GetSafeHwnd();
bi.pszDisplayName=name;
bi.lpszTitle="Select folder";
bi.ulFlags=BIF_RETURNONLYFSDIRS;
LPITEMIDLIST idl=SHBrowseForFolder(&bi);
if(idl==NULL)
return;
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));
str.ReleaseBuffer();
m_Path=str;
if(str.GetAt(str.GetLength()-1)!='\\')
m_Path ="\\";
UpdateData(FALSE);
}
void CCaptureDlg::SaveBmp()
{
CDC dc;
dc.CreateDC("DISPLAY",NULL,NULL,NULL);
CBitmap bm;
int Width=GetSystemMetrics(SM_CXSCREEN);
int Height=GetSystemMetrics(SM_CYSCREEN);
bm.CreateCompatibleBitmap(&dc,Width,Height);
CDC tdc;
tdc.CreateCompatibleDC(&dc);
CBitmap*pOld=tdc.SelectObject(&bm);
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);
tdc.SelectObject(pOld);
BITMAP btm;
bm.GetBitmap(&btm);
DWORD size=btm.bmWidthBytes*btm.bmHeight;
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);
BITMAPINFOHEADER bih;
bih.biBitCount=btm.bmBitsPixel;
bih.biClrImportant=0;
bih.biClrUsed=0;
bih.biCompression=0;
bih.biHeight=btm.bmHeight;
bih.biPlanes=1;
bih.biSize=sizeof(BITMAPINFOHEADER);
bih.biSizeImage=size;
bih.biWidth=btm.bmWidth;
bih.biXPelsPerMeter=0;
bih.biYPelsPerMeter=0;
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
static int filecount=0;
CString name;
name.Format("pictd.bmp",filecount );
name=m_Path name;
BITMAPFILEHEADER bfh;
bfh.bfReserved1=bfh.bfReserved2=0;
bfh.bfType=((WORD)('M'<< 8)|'B');
bfh.bfSize=54 size;
bfh.bfOffBits=54;
CFile bf;
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
bf.WriteHuge(lpData,size);
bf.Close();
nCount ;
}
GlobalFreePtr(lpData);
if(nCount==1)
m_Number.Format("%d picture captured.",nCount);
else
m_Number.Format("%d pictures captured.",nCount);
UpdateData(FALSE);
}
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)
{
if(pMsg -> message == WM_KEYDOWN)
{
if(pMsg -> wParam == VK_ESCAPE)
return TRUE;
if(pMsg -> wParam == VK_RETURN)
return TRUE;
}
return CDialog::PreTranslateMessage(pMsg);
}
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){
SaveBmp();
return FALSE;
}
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
CMenu pop;
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));
CMenu*pMenu=pop.GetSubMenu(0);
pMenu->SetDefaultItem(ID_EXITICON);
CPoint pt;
GetCursorPos(&pt);
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);
if(id==ID_EXITICON)
DeleteIcon();
else if(id==ID_EXIT)
OnCancel();
return FALSE;
}
LRESULT res= CDialog::WindowProc(message, wParam, lParam);
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)
AddIcon();
return res;
}
void CCaptureDlg::AddIcon()
{
NOTIFYICONDATA data;
data.cbSize=sizeof(NOTIFYICONDATA);
CString tip;
tip.LoadString(IDS_ICONTIP);
data.hIcon=GetIcon(0);
data.hWnd=GetSafeHwnd();
strcpy(data.szTip,tip);
data.uCallbackMessage=IDM_SHELL;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;
data.uID=98;
Shell_NotifyIcon(NIM_ADD,&data);
ShowWindow(SW_HIDE);
bTray=TRUE;
}
void CCaptureDlg::DeleteIcon()
{
NOTIFYICONDATA data;
data.cbSize=sizeof(NOTIFYICONDATA);
data.hWnd=GetSafeHwnd();
data.uID=98;
Shell_NotifyIcon(NIM_DELETE,&data);
ShowWindow(SW_SHOW);
SetForegroundWindow();
ShowWindow(SW_SHOWNORMAL);
bTray=FALSE;
}
void CCaptureDlg::OnChange()
{
RegisterHotkey();
}
BOOL CCaptureDlg::RegisterHotkey()
{
UpdateData();
UCHAR mask=0;
UCHAR key=0;
if(m_bControl)
mask|=4;
if(m_bAlt)
mask|=2;
if(m_bShift)
mask|=1;
key=Key_Table[m_Key.GetCurSel()];
if(bRegistered){
DeleteHotkey(GetSafeHwnd(),cKey,cMask);
bRegistered=FALSE;
}
cMask=mask;
cKey=key;
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);
return bRegistered;
}
四、小结
本实例通过一个钩子DLL实现了屏幕抓图的功能，它有一个缺陷，那就是只能保存整个屏幕图像，不过读者朋友可以在此基础上，实现屏幕任意区域的抓图功能，具体方法不再赘述，实现起来很容易的了，呵呵。
文章整理：西部数码--专业提供域名注册、虚拟主机服务
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