本文介绍了MDI子窗口和状态栏C win32 API的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
选择"文件->打开"菜单后，我正在创建MDI子窗口.在打开"开关语句中，我具有窗口创建功能
I am creating an MDI Child Window after selecting "File -> Open" Menu.In the "Open" switch statement I have the window creation function
HWND hwndChild = CreateWindowEx(WS_EX_MDICHILD, childClass, "MDI child", WS_CLIPCHILDREN, 0, 0, 400, 300, hWndClient, MAKEINTRESOURCE(IDM_FIRSTCHILD), GetModuleHandle(NULL), 0);
在该声明之后，我希望显示子MDI窗口，但是什么也没有发生.窗口句柄hwndChild也不同于NULL，并且错误消息框未显示.
After that declaration I expected the child MDI window to show but nothing happens. The window handle hwndChild is also different from NULL and the error MessageBox doesn't show.
似乎错误在于处理WndProc窗口函数内的WM_SIZE消息.
It seems that the error is in handling the WM_SIZE message inside the WndProc window function.
一种解决方法是放置
return DefFrameProc(hwnd, hWndClient, msg, wParam, lParam);
代替
return 0;
WndProc末尾的
.但是此解决方案与状态栏不兼容，因为它随后消失了.
at the end of WndProc. But this solution is not compatible with the status bar, as it then disappears.
这是完整的代码:
#include <windows.h>
#include <commctrl.h> //per SBARS_SIZEGRIP e STATUSCLASSNAME
#define IDM_OPEN 100
#define IDM_EXIT 101
#define IDM_ABOUT 102
#define IDC_STATUSBAR 103
#define IDM_ARRANGE 104
#define IDM_CASCADE 105
#define IDM_TILE 106
#define IDM_CLOSEALL 107
#define IDM_CLOSE 108
#define ID_CLIENTWND 109
#define IDM_FIRSTCHILD 5000
const char frameClass[] = "myFrameClass";
const char clientClass[] = "mdiclient"; //funziona solo con "mdiclient"
const char childClass[] = "myChildClass";
HWND hWndStatusBar;
HWND hWndClient;
//STEP 5 Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam){
switch (msg){
case WM_CREATE:
//STEP 6: Create Status Bar
hWndStatusBar = CreateWindowEx(0,STATUSCLASSNAME,NULL,
WS_CHILD | WS_VISIBLE | SBARS_SIZEGRIP,
0, 0, 0, 0,
hwnd,
(HMENU)IDC_STATUSBAR,
(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);
if(!hWndStatusBar){
MessageBox(NULL, "Failed To Create The Status Bar", "Error", MB_OK | MB_ICONERROR);
return 0;
}
// Establish the number of partitions or 'parts' the status bar will
// have, their actual dimensions will be set in the parent window's
// WM_SIZE handler.
RECT rc;
GetClientRect(hwnd, &rc);
int nHalf = rc.right / 2;
int nParts[4] = { nHalf, nHalf + nHalf / 3, nHalf + nHalf * 2 / 3, -1 };
SendMessage(hWndStatusBar, SB_SETPARTS, 4, (LPARAM)&nParts);
//crea la finestra CLIENT
CLIENTCREATESTRUCT ccs;
// Assign the 'Window' menu.
ccs.hWindowMenu = GetSubMenu(GetMenu(hwnd), 1); // uno perchè così la finestra appare nel secondo menu (partendo da zero) ovvero nel menu 'Windows'
ccs.idFirstChild = IDM_FIRSTCHILD;
// Create the client window. (quella che contiene i child!!)
hWndClient = CreateWindowEx(WS_EX_CLIENTEDGE, clientClass,//FUNZIONA SOLO CON "mdiclient"
NULL,
WS_CHILD | WS_CLIPCHILDREN | WS_VISIBLE,
0, 0, 0, 0,
hwnd,(HMENU)ID_CLIENTWND/*GetMenu(hwnd)*/,GetModuleHandle(NULL),&ccs);
if(hWndClient == NULL) {
MessageBox(NULL, "Client Window Creation Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
return 0;
}
break;
case WM_SIZE:
//resize the parts
GetClientRect(hwnd, &rc);
nHalf = rc.right / 2;
nParts[0] = nHalf; nParts[1] = nHalf + nHalf / 3; nParts[2] = nHalf + nHalf * 2 / 3; nParts[3] = -1;
SendMessage(hWndStatusBar, SB_SETPARTS, 4, (LPARAM)&nParts);
//resize the statusbar
SendMessage(GetDlgItem(hwnd, IDC_STATUSBAR), WM_SIZE,0,0);
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_COMMAND:
if(LOWORD(wParam) == IDM_EXIT) DestroyWindow(hwnd);
if(LOWORD(wParam) == IDM_ABOUT) MessageBox(hwnd,"ABOUT premuto","ciao",MB_OK);
if(LOWORD(wParam) == IDM_OPEN){
//apre il file...
//TODO
//crea la finestra CHILD
HWND hwndChild = CreateWindowEx(WS_EX_MDICHILD, //extended styles
childClass, //control 'class' name
"MDI child", //control caption
WS_CLIPCHILDREN, //control style
0, //position: left
0, //position: top
400, //width
300, //height
hWndClient, //parent window handle
//control's ID
MAKEINTRESOURCE(IDM_FIRSTCHILD),
GetModuleHandle(NULL), //application instance
0); //user defined info
if(hwndChild == NULL){
MessageBox(hwnd,"Impossibile creare la finestra Child","Errore",MB_ICONERROR);
}
}
break;
default:
//return DefWindowProc(hwnd,msg,wParam,lParam);
return DefFrameProc(hwnd, hWndClient, msg, wParam, lParam); //per tenere conto delle finestre figlie
}
return 0;
}
LRESULT CALLBACK ChildWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
switch(msg) {
case WM_CREATE :
// LPCREATESTRUCT lpCreateStruct = (LPCREATESTRUCT)lParam;
// LPMDICREATESTRUCT lpMDICreateStruct = (LPMDICREATESTRUCT)lpCreateStruct->lpCreateParams;
// FrameParam = lpMDICreateStruct->lParam;
break;
case WM_COMMAND:
break;
/* All other messages (a lot of them) are processed using default procedures */
default:
return DefMDIChildProc(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG msg;
//STEP 1: Registering Frame Class Window
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL,IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_APPWORKSPACE+1);//(COLOR_WINDOW);
wc.hIconSm = LoadIcon(NULL,IDI_APPLICATION);
wc.lpszMenuName = NULL;
wc.lpszClassName = frameClass;
if(!RegisterClassEx(&wc)){
MessageBox(NULL,"Frame Window Registration Failed!","Error!",MB_ICONEXCLAMATION);
return 0;
}
//la classe CLIENT non la devo registrare?
//STEP 1.2: Registering Child Class Window
wc.lpfnWndProc = (WNDPROC)ChildWndProc;
wc.hIcon = (HICON)LoadImage(0,IDI_APPLICATION,IMAGE_ICON,0,0,LR_SHARED);
wc.hIconSm = LoadImage(hInstance,childClass,IMAGE_ICON,16,16,LR_DEFAULTCOLOR);
wc.hCursor = (HCURSOR)LoadImage(0,IDC_ARROW,IMAGE_CURSOR,0,0,LR_SHARED);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);//(COLOR_WINDOW);
wc.lpszMenuName = NULL;
wc.lpszClassName = childClass;
if(!RegisterClassEx(&wc)){
MessageBox(NULL,"Child Window Registration Failed!","Error!",MB_ICONEXCLAMATION);
return 0;
}
//STEP 2: Creating the Window
hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,
frameClass,
"046 - Visualizer",
WS_VISIBLE|WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,600,400,
NULL,NULL,hInstance,NULL);
if(hwnd == NULL){
MessageBox(NULL,"Frame Window Creation Failed!","Error!",MB_ICONEXCLAMATION);
return 0;
}
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
//STEP 3: Create Menu
HMENU hMenu = CreateMenu(); //crea un menu vuoto
HMENU hSubMenu; //variabile usata per aggiungere sottomenu ti tipo POPUP
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu,MF_STRING,IDM_OPEN,"&Open");
AppendMenu(hSubMenu,MF_STRING,IDM_CLOSE,"&Close");
AppendMenu(hSubMenu, MF_SEPARATOR, 0, NULL);
AppendMenu(hSubMenu,MF_STRING,IDM_EXIT,"&Exit");
AppendMenu(hMenu,MF_STRING|MF_POPUP,(UINT)hSubMenu,"&File"); //aggiunge il sottomenu al menu
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu,MF_STRING,IDM_ARRANGE,"Arrange");
AppendMenu(hSubMenu,MF_STRING,IDM_CASCADE,"Cascade");
AppendMenu(hSubMenu,MF_STRING,IDM_TILE,"Tile");
AppendMenu(hSubMenu,MF_STRING,IDM_CLOSEALL,"Close All");
AppendMenu(hMenu,MF_STRING|MF_POPUP,(UINT)hSubMenu,"&Windows");
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu,MF_STRING,IDM_ABOUT,"&About");
AppendMenu(hMenu,MF_STRING|MF_POPUP,(UINT)hSubMenu,"&Help");
if(hMenu == NULL){
MessageBox(NULL,"Menu Creation Failed!","Error!",MB_ICONEXCLAMATION);
return 0;
}
SetMenu(hwnd,hMenu); //setta il menu sulla finestra
//STEP 4: Message Loop
while(GetMessage(&msg,NULL,0,0) > 0){
if(hWndClient && TranslateMDISysAccel(hWndClient,&msg)) continue; //process the predefined MDI specific accelerator keys
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
推荐答案
要在MDI框架中处理WM_SIZE，请参见 DefFrameProc
To handle WM_SIZE in MDI frame, see documentation for DefFrameProc
如果要调整框架客户端的大小，请返回零.如果您不调整大小，请传递到DefWindowProc(不是DefFrameProc)
If you are resizing the frame's client are, return zero. If you are not resizing then pass to DefWindowProc (not DefFrameProc)
要创建MDI子窗口，请使用 MDICREATESTRUCT 和SendMessage( ... WM_MDICREATE ... )，而不是CreateWindowEx(WS_EX_MDICHILD...
To create a MDI child window, use MDICREATESTRUCT and SendMessage( ... WM_MDICREATE ... ), instead of CreateWindowEx(WS_EX_MDICHILD...
建议解决此程序:
我正在使用略有不同的方法来处理默认值.另外IDM_EXIT应该调用WM_CLOSE
Suggestion to fix the procedure:
I am using a slightly different method to handle defaults. Also IDM_EXIT should call WM_CLOSE
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static MDICREATESTRUCT mdicreate;
static HINSTANCE hinstance;
switch(msg)
{
case WM_CREATE:
{
hinstance = (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE);
CLIENTCREATESTRUCT ccs = { 0 };
ccs.hWindowMenu = GetSubMenu(GetMenu(hwnd), 1);
ccs.idFirstChild = IDM_FIRSTCHILD;
hWndClient = CreateWindow("MDICLIENT", "",
WS_CHILD | WS_CLIPCHILDREN | WS_VISIBLE,
0, 0, 0, 0, hwnd, NULL, 0, &ccs);
CreateWindow(STATUSCLASSNAME, NULL, WS_CHILD | WS_VISIBLE | SBARS_SIZEGRIP,
0, 0, 0, 0, hwnd, (HMENU)IDC_STATUSBAR, hinstance, NULL);
return 0;
}
case WM_SIZE:
{
RECT rc;
GetClientRect(hwnd, &rc);
int nHalf = rc.right / 2;
int nParts[4];
nParts[0] = nHalf;
nParts[1] = nHalf + nHalf / 3;
nParts[2] = nHalf + nHalf * 2 / 3;
nParts[3] = -1;
SendMessage(GetDlgItem(hwnd, IDC_STATUSBAR), SB_SETPARTS, 4, (LPARAM)&nParts);
SendMessage(GetDlgItem(hwnd, IDC_STATUSBAR), WM_SIZE, 0, 0);
RECT statusRect;
GetClientRect(GetDlgItem(hwnd, IDC_STATUSBAR), &statusRect);
rc.bottom -= statusRect.bottom;
MoveWindow(hWndClient, 0, 0, rc.right, rc.bottom, TRUE);
return 0;
}
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_COMMAND:
if(LOWORD(wParam) == IDM_EXIT)
{
SendMessage(hwnd, WM_CLOSE, 0, 0);
return 0;
}
if(LOWORD(wParam) == IDM_ABOUT)
MessageBox(hwnd, "ABOUT premuto", "ciao", MB_OK);
if(LOWORD(wParam) == IDM_OPEN)
{
mdicreate.szClass = childClass;
mdicreate.szTitle = "Title";
mdicreate.hOwner = hinstance;
mdicreate.x = CW_USEDEFAULT; //change this to a small number
mdicreate.y = CW_USEDEFAULT;
mdicreate.cx = CW_USEDEFAULT;
mdicreate.cy = CW_USEDEFAULT;
mdicreate.style = 0;
mdicreate.lParam = 0;
SendMessage(hWndClient, WM_MDICREATE, 0, (LPARAM)
(LPMDICREATESTRUCT)&mdicreate);
}
break;
}
return DefFrameProc(hwnd, hWndClient, msg, wParam, lParam);
}
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