20 tips for VC development

Tips for VC development: 20 I, Open the CD-ROM mcisendstring ("set cdaudio door open wait", null, 0, null );

II,Disable cd_rom mcisendstring ("set cdaudio door closed wait", null, 0, null );

III,Close the computer osversioninfo; // data structure containing the operating system version information
Osversioninfo. dwosversioninfosize = sizeof (osversioninfo );
Getversionex (& osversioninfo); // get the operating system version
If (osversioninfo. dwplatformid = ver_platform_win32_windows)
{
// Windows98, call the exitwindowsex () function to restart the computer
DWORD dwreserved;
Exitwindowsex (ewx_reboot, dwreserved); // you can change the first parameter to unregister a user,
// Shutdown, power off, and other operations// Some processing programs before exiting}

4. restart the computer typedef int (callback * shutdowndlg) (INT); // display the function pointer in the shutdown dialog box.
Hinstance hinst = loadlibrary ("shell32.dll"); // load shell32.dll
Shutdowndlg shutdowndialog; // pointer to the function in the shutdown dialog box displayed in the shell32.dll Library
If (hinst! = NULL)
{
// Obtain and call the function address
Shutdowndialog = (shutdowndlg) getprocaddress (hinst, (lpstr) 60 );
(* Shutdowndialog) (0 );
}

5. enumerate all fonts
Logfont lf;Lf. lfcharset = default_charset; // initialize the logfont structure strcpy (LF. lffacename, ""); cclientdc DC (this); // enumerate the font families: encrypt (HDC) DC, & lf, (fontenumproc) enumfontfamproc, (lparam) This, 0 );
// Int callback (effeclpelf, lpnewtextmetric lpntm, DWORD nfonttype, long lparam) {// create a pointer to the dialog window cday7dlg * pwnd = (cday7dlg *) lparam; // Add the font name to the list box pwnd-> m_ctlfontlist.addstring (lpelf-> elflogfont. lffacename); // return 1 to continue font enumeration return 1 ;}
M_ctlfontlist is a list control variable.6. Run only one program instance at a time. Exit if it is already running.If (findwindow (null, "program title") Exit (0 );7. Get the current mouse positionCpoint pt; getcursorpos (& pt); // obtain the location

8. Context Menu event triggering event: Oncontextmenu event

9. Show and hide program menusCwnd * pwnd = afxgetmainwnd ();
If (B _m) // hide the menu
{
Pwnd-> setmenu (null );
Pwnd-> drawmenubar ();
B _m = false;
}
Else
{
Cmenu menu;
Menu. loadmenu (idr_mainframe); // you can change the menu items when the menu is displayed.
Pwnd-> setmenu (& menu );
Pwnd-> drawmenubar ();
B _m = true;
Menu. Detach ();
}

10. Obtain the executable file iconHicon =: extracticon (AfxGetInstanceHandle (), _ T ("notepad.exe"), 0); If (hicon & hicon! = (Hicon)-1) {PDC-> drawicon (10, 10, hicon);} destroyicon (hicon ); 11. Demonstration of window auto-bypass ProgramBool adjustpos (crect * lprect) {// automatic edge int ISX = getsystemmetrics (TRIM); int ISY = getsystemmetrics (TRIM); rect rworkarea; bool bresult = systemparametersinfo (spi_getworkarea, sizeof (rect), & rworkarea, 0); crect rcwa; If (! Bresult) {// if the call fails, use getsystemmetrics to obtain the screen area rcwa = crect (, ISX, ISY);} else rcwa = rworkarea; int IX = lprect-> left; int Iy = lprect-> top; If (IX <rcwa. left + detastep & Ix! = Rcwa. left) {// Adjust left // pwnd-> setwindowpos (null, rcwa. left, Iy, 0, 0, swp_nosize); lprect-> offsetrect (rcwa. left-IX, 0); adjustpos (lprect); Return true;} If (Iy <rcwa. top + detastep & Iy! = Rcwa. top) {// adjust // pwnd-> setwindowpos (null, IX, rcwa. top, 0, 0, swp_nosize); lprect-> offsetrect (0, rcwa. top-Iy); adjustpos (lprect); Return true;} If (IX + lprect-> width ()> rcwa. right-detastep & Ix! = Rcwa. right-lprect-> width () {// Adjust right // pwnd-> setwindowpos (null, rcwa. right-rcW.Width (), Iy, swp_nosize); lprect-> offsetrect (rcwa. right-lprect-> right, 0); adjustpos (lprect); Return true;} If (Iy + lprect-> height ()> rcwa. bottom-detastep & Iy! = Rcwa. bottom-lprect-> height () {// adjust the following // pwnd-> setwindowpos (null, IX, rcwa. bottom-rcW.Height (), swp_nosize); lprect-> offsetrect (0, rcwa. bottom-lprect-> bottom); Return true;} return false;} // call the crect r = * prect in the onmoveing event using the following procedure; adjustpos (& R ); * prect = (rect) R;

12. Add a menu item to the System MenuTo add a menu item to the system menu, perform the following three steps: first, use the resource symbols Dialog (select resource symbols in the View menu... define the menu item ID, which must be greater than 0x0f and less than 0xf000. Second, call cwnd: getsystemmenu to obtain the pointer of the System menu and call cwnd :: appendmenu adds menu items to the menu. The following example adds two new int cmainframe: oncreate (lpcreatestruct ){... // Make sure system menu item is in the right range. assert (idm_mysysitem <0xf000); // get pointer to system menu. cmenu * psysmenu = getsystemmenu (false); assert_valid (psysmenu); // Add a separator and our menu item to system menu. cstring strmenuitem (_ T ("new menu item"); psysmenu-> appendmenu (mf_separator); psysmenu-> appendmenu (mf_string, idm_mysysitem, strmenuitem );...}

13. Run other programs// 1. Run the email or URL char szmailaddress [80]; strcpy (szmailaddress, "mailto: netvc@21cn.com"); ShellExecute (null, "open", szmailaddress, null, null, sw_shownormal); // 2. Run the executable program
Winexec ("notepad.exe", sw_show); // run the event plan 14. add or delete menus dynamically 1, Add menu// Add cmenu * mainmenu; mainmenu = afxgetmainwnd ()-> getmenu (); // obtain the main menu (mainmenu-> getsubmenu (0)-> appendmenu (mf_separator ); // Add a separator (mainmenu-> getsubmenu (0)-> appendmenu (mf_string, id_app_about, _ T ("Always On & Top ")); // Add a new menu item drawmenubar (); // re-draw the menu

2, Delete menu// Delete cmenu * mainmenu; mainmenu = afxgetmainwnd ()-> getmenu (); // obtain the main menu cstring STR; For (INT I = (mainmenu-> getsubmenu (0 )) -> getmenuitemcount ()-1; I> = 0; I --) // gets the number of menu items. {(Mainmenu-> getsubmenu (0)-> getmenustring (I, STR, mf_byposition); // copy the label of the specified menu item to the specified buffer. The description of mf_byposition can be found in. If (STR = "Always On & Top") // if it is the menu item we just added, delete it. {(Mainmenu-> getsubmenu (0)-> deletemenu (I, mf_byposition); break ;} 15. Change the application icon
Static change: Modify the icon resource idr_mainframe. It has two icons, one of which is 16*16 and the other is 32*32. Be sure to modify them together.
Dynamic Change: Send the wm_seticon message to the main window. The Code is as follows:
Hicon = afxgetapp ()-> loadicon (idi_icon );
Assert (hicon );
Afxgetmainwnd ()-> sendmessage (wm_seticon, true, (lparam) hicon ); 16. Another method for changing the window titleUse the cwnd * m_pcwnd = afxgetmainwnd () statement, and then call the setwindowtext () function in the following form:
Setwindowtext (* m_pcwnd, (lpctstr) m_windowtext); // m_windowtext can be a cstring variable. 17. Copy image data through Enhanced Meta files on the clipboardThe following code copies image data to any application through a Metafile, which can be placed in the function of the cview derived class. Cmetafiledc * m_pmetadc = new cmetafiledc (); m_pmetadc-> createenhanced (getdc (), null, null, "whatever "); // draw Meta File // do what ever you want to do: bitmaps, lines, text... // close Meta File DC and prepare for clipboard; henhmetafile hmf = m_pmetadc-> closeenhanced (); // copy to clipboard openclipboard (); emptyclipboard ();: setclipboarddata (callback, hmf); closeclipboard (); // deletemetafile (hmf); Delete m_pmetadc; 18. Transfer of text data on the clipboardPlace the text on the Splicing board: cstring source; // put your text in source if (openclipboard () {hglobal clipbuffer; char * buffer; emptyclipboard (); clipbuffer = globalalloc (gmem_ddeshare, source. getlength () + 1); buffer = (char *) globallock (clipbuffer); strcpy (buffer, lpcstr (source); globalunlock (clipbuffer); setclipboarddata (cf_text, clipbuffer ); closeclipboard ();} get text from the Splicing board: char * buffer; If (openclipboard () {buffer = (char *) getclipboarddata (cf_text ); // do something with buffer here // before it goes out of scope} closeclipboard (); 19. Capture the screen image to the cut version

Void preview: oncutscreen () {showwindow (sw_hide); rect r_bmp = {0,: getsystemmetrics (sm_cxscreen),: getsystemmetrics (sm_cyscreen)}; hbitmap; hbitmap = copyscreentobitmap (& r_bmp); // hwnd is the program window handle if (openclipboard () {emptyclipboard (); setclipboarddata (cf_bitmap, hbitmap); closeclipboard ();} showwindow (sw_show);} hbitmap representation: copyscreentobitmap (lprect) {// lprect represents the selected region {HDC hscrdc, hmemdc; // hbitmap table for screen and memory devices, holdbitmap; // bitmap handle int NX, NY, nx2, ny2; // The coordinates of the selected area int nwidth, nheight; // The bitmap width and height int xscrn, yscrn; // screen resolution // ensure that the selected area is not empty. If (isrectempty (lprect) return NULL; // create a device description table for the screen. hscrdc = createdc ("display ", null, null, null); // create a compatible memory device description table hmemdc = createcompatibledc (hscrdc) for the screen device description table ); // obtain the coordinates of the selected region Nx = lprect-> left; ny = lprect-> top; nx2 = lprect-> right; ny2 = lprect-> bottom; // obtain the screen resolution xscrn = getdevicecaps (hscrdc, horzres); yscrn = getdevicecaps (hscrdc, vertres); // make sure that the selected area is visible if (nx <0) nx = 0; If (NY <0) ny = 0; If (nx2> xscrn) nx2 = xscrn; If (ny2> yscrn) ny2 = yscrn; nwidth = nx2-NX; nheight = ny2-NY; // create a bitmap hbitmap = createcompatiblebitmap (hscrdc, nwidth, nheight) compatible with the on-screen device description table ); // select the new bitmap to the holdbitmap = (hbitmap) SelectObject (hmemdc, hbitmap) in the memory device description table; // copy the on-screen device description table to the memory device description table Bitblt (H