Into the world of Windows programming-----Message Processing functions (4)

A right-click menu
1 Right-click menu
When the right mouse button is clicked in the window, the menu pops up.
2 use of the right-click menu
2.1 Creating a Menu
CreatePopupMenu
2.2 Menu Additions
AppendMenu
2.3 Menu Display,

BOOL TrackPopupMenu (    HMENU HMENU,//menu handle UINT uflags,//Display the    way  int x,//menu x screen coordinates  int y,//Menu Y-screen coordinates  int nreserved,//reserved, must be 0  HWND hwnd,//Handle the window handle of the menu command  CONST RECT *prcrect); Ignore

2.4 Menu command handling

Wm_command
2.5 Where to use the right-click menu
2.5.1 Wm_rbuttonup News
In Wm_rbuttonup, add menu creation and display,
Right-click Message coordinates, converted to screen coordinates used.
ClientToScreen.
2.5.2 Wm_contextmenu News
The message that is used to display the right-click menu.
WPARAM-corresponding window handle when right-click Lift
LPARAM-the screen coordinate position of the mouse when the right button is lifted
LoWord (LParam)-X screen coordinates
HiWord (LParam)-y screen coordinates
2.5.3 Wm_rbuttonup and Wm_contextmenu contrast
1) coordinate system, Wm_rbuttonup client area coordinates, wm_contextmenu screen coordinates
2) First Wm_rbuttonup message, after Wm_contextmenu message

/* File:winPopMenu.cpp * Auth:sjin * date:20140706 * Mail: [email protected] */#include &LT;WI ndows.h> #include <stdio.h>hinstance g_hinst = null;void Onrbuttonup (HWND hwnd, UINT nmsg, WPARAM wPa    RAM, LPARAM LPARAM) {//Create pop-up menu HMENU Hpopmenu = CreatePopupMenu ();    Add menu item AppendMenu (Hpopmenu, mf_string, 1001, "Test 1");    AppendMenu (Hpopmenu, Mf_separator, 0, NULL);    AppendMenu (Hpopmenu, mf_string, 1002, "exit");    Gets the menu position, point, "{0}";    Point.x = LoWord (LParam);    Point.y = HiWord (LParam);    ClientToScreen (HWnd, &point); Display Menu TrackPopupMenu (Hpopmenu, Tpm_leftalign, Point.x, Point.y, 0, HWnd, NULL);} void OnContextMenu (HWND hwnd, UINT nmsg, WPARAM WPARAM, LPARAM LPARAM) {//Create pop-up menu HMENU Hpopmenu = createpopup    Menu ();    Add menu item AppendMenu (Hpopmenu, mf_string, 1001, "Test 2");    AppendMenu (Hpopmenu, Mf_separator, 0, NULL); AppendMenu (Hpopmenu, mf_string, 1002, "Exit");    coordinates get int nX = LOWORD (LParam);    int NY = HiWord (LParam);    Display Menu TrackPopupMenu (Hpopmenu, Tpm_leftalign, NX, NY, 0, HWnd, NULL); Delete Menu DestroyMenu (hpopmenu);}    void OnCommand (HWND hwnd, UINT nmsg, WPARAM WPARAM, LPARAM LPARAM) {int ncmdid = LOWORD (WPARAM);        Switch (ncmdid) {case 1001:messagebox (NULL, "Hello popmenu", "Popmenu", MB_OK);    Break        Case 1002:postquitmessage (0);    Break                          }}lresult CALLBACK WndProc (HWND hwnd, UINT nmsg, WPARAM WPARAM, LPARAM LPARAM) {switch (nmsg) {case wm_rbuttonup://onrbuttonup (hWnd, nmsg, WPa        RAM, LParam);    Break        Case Wm_contextmenu:oncontextmenu (HWnd, Nmsg, WParam, LParam);    Break        Case Wm_command:oncommand (HWnd, Nmsg, WParam, LParam);    Break    Case Wm_destroy:postquitmessage (0);    return 0; } return DefWindowProc (HWnd, Nmsg, WParam, LParam);}    BOOL Registerwnd (LPSTR pszclassname) {wndclassex WCE = {0};    wce.cbsize = sizeof (WCE);    Wce.cbclsextra = 0;    Wce.cbwndextra = 0;    Wce.hbrbackground = Hbrush (Color_window);    Wce.hcursor = NULL;    Wce.hicon = NULL;    WCE.HICONSM = NULL;    Wce.hinstance = G_hinst;    Wce.lpfnwndproc = WndProc;    Wce.lpszclassname = Pszclassname;    Wce.lpszmenuname = NULL;    Wce.style = Cs_hredraw|cs_vredraw;    ATOM Natom = RegisterClassEx (&AMP;WCE);    if (0 = = Natom) {return FALSE; } return TRUE; HWND Createwnd (LPSTR pszclassname) {hwnd hwnd = CREATEWINDOWEX (0, Pszclassname, "Mywnd", Ws_overlappe    Dwindow, Cw_usedefault, Cw_usedefault, Cw_usedefault, cw_usedefault, NULL, NULL, G_HINST, NULL); return hWnd;}    void Displaywnd (HWND hwnd) {ShowWindow (hwnd, sw_show); UpdateWindow (hWnd);}    void Message () {msg msg = {0};        while (GetMessage (&msg, NULL, 0, 0)) {translatemessage (&msg);    DispatchMessage (&AMP;MSG); }}int apientry WinMain (hinstance hinstance, hinstance hprevinstance, LPSTR LpC    mdline, int ncmdshow) {g_hinst = hinstance;    Registerwnd ("Mywnd");    HWND hwnd = Createwnd ("Mywnd");    Displaywnd (HWND);    Message (); return 0;}