c use IPicture to display online pictures (specified by URL)
Blog Category:Desktop Programs (VC, Dephi,. Net) VC + + MFC programming Windows data Structure/************************************************************/
VC IPicture
Display network picture display remote picture display URL specified picture
Download display images via HTTP to display online advertising images
Above is my list of key words, I find this article for several kinds of keyword writing, only to find,
In order to make it easier for people, I wrote all the keywords.
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The article is very good, just solves my problem. Thanks to the author. This is a program developed using the SDK (without MFC).
If the SDK development method is not very familiar, just look at the Showpic function.
Reprinted article, original address: http://www.blogjava.net/Unmi/archive/2007/12/02/164605.html #include <windows.h> // Windows SDK #include to use <commdlg.h> // Open the File window to include this header file //Use IPicture interface, to include the following two header files # include <ocidl.h> #include <olectl.h> // Declaration window function Prototype lresult callback mainwndproc ( hwnd , UINT , WPARAM , LPARAM ); // declaration shows the function prototype of the picture Hresult showpic ( char *lpstrFile, Hwnd hwnd) ; //Picture filename char lpstrfile[ max_path]= "" ; int winapi winmain ( hinstance hthisinstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nfunsterstil) { // window class name char szclassname[ ] = "Showpicture" ; wndclassex windclass; // Fill WNDCLASSEX structure with parameters describing the main window windclass.cbSize = sizeof (windclass); //structure size windclass.hinstance = hthisinstance; //instance clauses phenol windclass.lpszClassName = szClassName; windclass.lpfnwndproc = mainwndproc; //window function Pointers windclass.style = CS_DBLCLKS; //capture Double-click event windclass.cbSize = sizeof (wndclassex); windclass.hicon = loadicon (NULL,&NBsp;idi_application) //use pre-defined icons windclass.hiconsm = LoadIcon (null, idi_application) //use small icons for predefined classes windclass.hCursor = LoadCursor (Null, idc_arrow) //using predefined cursors windclass.lpszMenuName = NULL; //do not specify main menu windclass.cbClsExtra = 0; //no additional class memory windclass.cbWndExtra = 0; //no additional window memory &NBSP;&NBSP;&NBsp; windclass.hbrBackground = ( HBRUSH ) color_background; //using pre-defined background brushes //Register this window class if you fail to exit the program directly if (! registerclassex (&windclass)) return 0; Create main window HWND hWnd = CreateWindowEx ( 0, //dwExStyle, Extended Styles szclassname, & NBsp; //lpclassname, class name "Show picture -- mouse Double click Browse picture file -- author:unmi" , lpwindowname, title ws_overlappedwindow, //dwStyle, window style cw_ usedefault, //x, initial X coordinate cw_usedefault, //y, Initial YX coordinates 640, //nwidth, Width 480, //nheight, Height HWND_DESKTOP, //hWndParent, parent Window Handle NULL, //hMenu, Menu Handles hThisInstance, hinstance, Program Instance handle NULL //lpparam, User Data ); //Display window, Refresh window client area showwindow&nbSP; (hwnd, nfunsterstil); // take the message out of the message queue and give it to the window function processing // until getmessage the message is wm_quit, or false, to end the message loop MSG messages; while (getmessage ( &messages, null, 0, 0) { //convert keyboard messages, convert virtual keys to character messages translatemessage (&messages); //sends a message to the appropriate window function dispatchmessage (&messages); } // getmessage return false, program end postquitmessage () Send this message return messages.wParam; } // window functions, messages from DispatchMessage distributed Lresult callback mainwndproc ( hwnd hwnd, uint message, wparam wparam, lparam lparam) { switch (message) //processing messages { case WM_DESTROY: //post a WM_QUIT message to the message queue, prompting the GetMessage function to return 0, ending the message loop postquitmessage (0); break ; case WM_LBUTTONDBLCLK: { OPENFILENAME file = {0}; file.lStructSize = sizeof ( File); file.lpstrtitle = "Please select a picture file" ; file.lpstrFile = lpstrFile; file.nMaxFile = MAX_PATH; file.lpstrFilter = "Pictures (*.jpg,*.gif,*.bmp) \0*.jpg;*. Gif;*.bmp\0\0 " ; if (:: GetOpenFileName (&file)) { //clear the original image HDC&NBSP;&NBSP;HDC=GETDC (hWnd); RECT rect; ::getwindowrect (HWnd,&rect); &NBSP;&NBSP;&NBSP; ::fillrect (Hdc,&rect, ( HBRUSH ) color_background); ::sendmessage (hwnd,wm_paint,null,null); } } break ; case WM_PAINT: showpic (Lpstrfile,hwnd); break ; default : //The messages we don't handle to the system do the default processing return DefWindowProc (hwnd, message, wparam, lparam); } return 0; } // Show picture, lpstrimgurl as Picture URL address,hwnd For window handles hresult utils::showpic ( char *lpstrimgurl, hwnd hwnd) { &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;HDC&NBSP;&NBSP;HDC_TEMP=GETDC (hWnd); IPicture *pPic; IStream *pStm; BOOL bResult; DWORD dwfilesize,dwbyteread; //read the picture file on the webpage, is actually a chttpfile pointer Cinternetsession session ( "HttpClient" ); CFile* httpfile = (cfile*) session. OpenURL (lpstrimgurl); if (httpfile!=invalid_handle_value) { &nbsP;dwfilesize= httpfile->getlength (); //gets the number of file bytes if (DWFILESIZE==0XFFFFFFFF) return &nbs
