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Пишу простой графический редактор. По заданию необходимо работать с enh-метафайлами. Программа работает так: рисую мышью на форме, попутно рисую всё на метафайл. Чтобы при сворачивании формы изображение не пропадало, обрабатываю сообщение WM_PAINT - закрываю старый метафайл и создаю новый, проигрываю старый в новый и на экран, удаляю старый. Вот проблема: при перемещении или сворачивании формы программа начинает жутко тормозить, а если начать ещё что-нибудь рисовать, так и вообще виснет. Проблема с метафайлами. Вот весь мой код, внимательно посмотрите на обработку WM_PAINT, может тут что не так: | Код |
// GraphicsEditor.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include <windows.h>
#include <CommDlg.h>
#include <stdio.h>
#include <string.h>
#include "GraphicsEditor.h"
#define MAX_LOADSTRING 100
#define ID_BUTTONLINE 1000
#define ID_BUTTTONRECTANGLE 1001
#define ID_BUTTONELLIPSE 1002
#define ID_BUTTONPOLYGON 1003
#define ID_BUTTONPOLYLINE 1004
#define ID_EDIT 1005
#define ID_BUTTONTEXT 1006
#define CM_FILE_OPEN 1007
#define CM_FILE_SAVE 1008
#define FILE_NAME1 "Metafile1.emf"
#define FILE_NAME2 "Metafile2.emf"
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_GRAPHICSEDITOR, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_GRAPHICSEDITOR));
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage are only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GRAPHICSEDITOR));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_GRAPHICSEDITOR);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
BOOL CreateMenuItem(HMENU hMenu,char *str,UINT uIns,UINT uCom,HMENU hSubMenu,BOOL flag,UINT fType)
{
MENUITEMINFO mii;
mii.cbSize=sizeof(MENUITEMINFO);
mii.fMask=MIIM_STATE|MIIM_TYPE|MIIM_SUBMENU|MIIM_ID;
mii.fType=fType;
mii.fState=MFS_ENABLED;
mii.dwTypeData=str;
mii.cch=sizeof(str);
mii.wID=uCom;
mii.hSubMenu=hSubMenu;
return InsertMenuItem(hMenu,uIns,flag,&mii);
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC static hdc,hdc1,hdc2;
HDC static hdcSaveFile;
HWND static hButtonLine,hButtonRectangle,hButtonEllipse,hButtonPolyline,hButtonPolygon,hEdit,hButtonText;
int static x0,y0,x1,y1,x2,y2,oldMixMode;
HENHMETAFILE hEnhMtf;
static bool b,bPoly,bText,flag;
static int id;
int i;
static HBRUSH hBrush;
static HPEN hPen;
static HMENU hMainMenu,hFileMenu;
static OPENFILENAME ofn;
static char fullpath[256],filename[256],dir[256];
char lpString[100];
ENHMETAHEADER emh;
RECT rect;
switch (message)
{
case WM_CREATE:
hdc=GetDC(hWnd);
hButtonLine=CreateWindow("button","Line",WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
100,100,100,30,hWnd,(HMENU)ID_BUTTONLINE,hInst,NULL);
hButtonRectangle=CreateWindow("button","Rectangle",WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
100,150,100,30,hWnd,(HMENU)ID_BUTTTONRECTANGLE,hInst,NULL);
hButtonEllipse=CreateWindow("button","Ellipse",WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
100,200,100,30,hWnd,(HMENU)ID_BUTTONELLIPSE,hInst,NULL);
hButtonPolyline=CreateWindow("button","Polyline",WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
100,250,100,30,hWnd,(HMENU)ID_BUTTONPOLYLINE,hInst,NULL);
hButtonPolygon=CreateWindow("button","Polygon",WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
100,300,100,30,hWnd,(HMENU)ID_BUTTONPOLYGON,hInst,NULL);
hEdit=CreateWindow("edit",NULL,WS_VISIBLE|WS_CHILD|WS_BORDER,
100,350,100,20,hWnd,(HMENU)ID_EDIT,hInst,NULL);
hButtonText=CreateWindow("button","Text",WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
100,380,100,30,hWnd,(HMENU)ID_BUTTONTEXT,hInst,NULL);
hMainMenu=CreateMenu();
hFileMenu=CreatePopupMenu();
i=0;
CreateMenuItem(hFileMenu,"&Open",i++,CM_FILE_OPEN,NULL,FALSE,MFT_STRING);
CreateMenuItem(hFileMenu,"&Save",i++,CM_FILE_SAVE,NULL,FALSE,MFT_STRING);
i=0;
CreateMenuItem(hMainMenu,"&File",i++,0,hFileMenu,FALSE,MFT_STRING);
SetMenu(hWnd,hMainMenu);
DrawMenuBar(hWnd);
GetClientRect(hWnd,&rect);
hdc1=CreateEnhMetaFile(NULL,NULL,NULL,NULL);
flag=false;
hBrush=(HBRUSH)GetStockObject(NULL_BRUSH);
SelectObject(hdc,hBrush);
hPen=(HPEN)GetStockObject(BLACK_PEN);
SelectObject(hdc,hPen);
SelectObject(hdc1,hBrush);
SelectObject(hdc1,hPen);
break;
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
case ID_BUTTONLINE:
//MessageBox(hWnd,"Нажата кнопка Line","Message",0);
//SendMessage(hWnd,WM_PAINT,0,0);
//UpdateWindow(hWnd);
id=ID_BUTTONLINE;
break;
case ID_BUTTONELLIPSE:
id=ID_BUTTONELLIPSE;
break;
case ID_BUTTTONRECTANGLE:
id=ID_BUTTTONRECTANGLE;
break;
case ID_BUTTONPOLYLINE:
id=ID_BUTTONPOLYLINE;
break;
case ID_BUTTONPOLYGON:
id=ID_BUTTONPOLYGON;
break;
case ID_BUTTONTEXT:
id=ID_BUTTONTEXT;
break;
case CM_FILE_OPEN:
ofn.lStructSize=sizeof(OPENFILENAME);
ofn.hwndOwner=hWnd;
ofn.hInstance=hInst; // дескриптор копии приложения
ofn.lpstrFilter="Metafile (*.emf)\0*.emf\0Все файлы (*.*)\0*.*\0";
ofn.nFilterIndex=1;
ofn.lpstrFile=fullpath;
ofn.nMaxFile=sizeof(fullpath);
ofn.lpstrFileTitle=filename;
ofn.nMaxFileTitle=sizeof(filename);
ofn.lpstrInitialDir=dir;
ofn.lpstrTitle="Open file...";
ofn.Flags=OFN_EXPLORER|OFN_CREATEPROMPT|OFN_ALLOWMULTISELECT;
if(GetOpenFileName(&ofn))
{
hdc1=CreateEnhMetaFile(NULL,NULL,NULL,NULL);
hEnhMtf=GetEnhMetaFile(fullpath);
GetEnhMetaFileHeader(hEnhMtf,sizeof(ENHMETAHEADER),&emh);
SetRect(&rect,emh.rclBounds.left,emh.rclBounds.top,emh.rclBounds.right,emh.rclBounds.bottom);
SelectObject(hdc1,hBrush);
SelectObject(hdc1,hPen);
PlayEnhMetaFile(hdc1,hEnhMtf,&rect);
PlayEnhMetaFile(hdc,hEnhMtf,&rect);
InvalidateRect(hWnd,NULL,TRUE);
UpdateWindow(hWnd);
DeleteEnhMetaFile(hEnhMtf);
}
break;
case CM_FILE_SAVE:
ofn.lStructSize=sizeof(OPENFILENAME);
ofn.hwndOwner=hWnd;
ofn.hInstance=hInst; // дескриптор копии приложения
ofn.lpstrFilter="Metafile (*.emf)\0*.emf\0Все файлы (*.*)\0*.*\0";
ofn.nFilterIndex=1;
ofn.lpstrFile=fullpath;
ofn.nMaxFile=sizeof(fullpath);
ofn.lpstrFileTitle=filename;
ofn.nMaxFileTitle=sizeof(filename);
ofn.lpstrInitialDir=dir;
ofn.lpstrTitle="Save file as...";
ofn.Flags=OFN_PATHMUSTEXIST|OFN_OVERWRITEPROMPT|OFN_HIDEREADONLY|OFN_EXPLORER;
if(GetSaveFileName(&ofn))
{
hEnhMtf=CloseEnhMetaFile(hdc1);
CopyEnhMetaFile(hEnhMtf,fullpath);
hdc1=CreateEnhMetaFile(NULL,NULL,NULL,NULL);
GetEnhMetaFileHeader(hEnhMtf,sizeof(ENHMETAHEADER),&emh);
SetRect(&rect,emh.rclBounds.left,emh.rclBounds.top,emh.rclBounds.right,emh.rclBounds.bottom);
SelectObject(hdc1,hBrush);
SelectObject(hdc1,hPen);
PlayEnhMetaFile(hdc1,hEnhMtf,&rect);
PlayEnhMetaFile(hdc,hEnhMtf,&rect);
DeleteEnhMetaFile(hEnhMtf);
}
break;
default:
id=0;
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_MOUSEMOVE:
if(b&&(bPoly==false))
{
SetROP2(hdc,R2_NOTXORPEN);
switch(id)
{
case ID_BUTTONLINE:
MoveToEx(hdc,x1,y1,NULL);
LineTo(hdc,x2,y2);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
MoveToEx(hdc,x1,y1,NULL);
LineTo(hdc,x2,y2);
break;
case ID_BUTTTONRECTANGLE:
Rectangle(hdc,x1,y1,x2,y2);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
Rectangle(hdc,x1,y1,x2,y2);
break;
case ID_BUTTONELLIPSE:
Ellipse(hdc,x1,y1,x2,y2);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
Ellipse(hdc,x1,y1,x2,y2);
break;
}
}
if(b&&bPoly)
{
SetROP2(hdc,R2_NOTXORPEN);
MoveToEx(hdc,x1,y1,NULL);
LineTo(hdc,x2,y2);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
MoveToEx(hdc,x1,y1,NULL);
LineTo(hdc,x2,y2);
}
break;
case WM_LBUTTONDOWN:
switch(id)
{
case ID_BUTTONELLIPSE:
case ID_BUTTONLINE:
case ID_BUTTTONRECTANGLE:
x1=x2=LOWORD(lParam);
y1=y2=HIWORD(lParam);
if((id==ID_BUTTONLINE))
MoveToEx(hdc,x1,y1,NULL);
break;
case ID_BUTTONPOLYLINE:
case ID_BUTTONPOLYGON:
if(bPoly==false)
{
x0=x1=x2=LOWORD(lParam);
y0=y1=y2=HIWORD(lParam);
bPoly=true;
}
break;
break;
case ID_BUTTONTEXT:
x1=x2=LOWORD(lParam);
y1=y2=HIWORD(lParam);
bText=true;
}
b=true;
break;
case WM_RBUTTONUP:
if(bPoly)
{
SetROP2(hdc,R2_COPYPEN);
MoveToEx(hdc,x1,y1,NULL);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
LineTo(hdc,x2,y2);
MoveToEx(hdc1,x1,y1,NULL);
LineTo(hdc1,x2,y2);
if(id==ID_BUTTONPOLYGON)
{
LineTo(hdc,x0,y0);
LineTo(hdc1,x0,y0);
}
bPoly=false;
}
case WM_LBUTTONUP:
if(b&&(bPoly==false)&&(bText==false))
{
SetROP2(hdc,R2_COPYPEN);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
switch (id)
{
case ID_BUTTONLINE:
MoveToEx(hdc,x1,y1,NULL);
LineTo(hdc,x2,y2);
MoveToEx(hdc1,x1,y1,NULL);
LineTo(hdc1,x2,y2);
break;
case ID_BUTTONELLIPSE:
Ellipse(hdc,x1,y1,x2,y2);
Ellipse(hdc1,x1,y1,x2,y2);
break;
case ID_BUTTTONRECTANGLE:
Rectangle(hdc,x1,y1,x2,y2);
Rectangle(hdc1,x1,y1,x2,y2);
break;
}
b=false;
}
if(b&&bPoly)
{
SetROP2(hdc,R2_COPYPEN);
MoveToEx(hdc,x1,y1,NULL);
MoveToEx(hdc1,x1,y1,NULL);
x2=LOWORD(lParam);
y2=HIWORD(lParam);
LineTo(hdc,x2,y2);
LineTo(hdc1,x2,y2);
x1=x2;
y1=y2;
b=false;
}
if(b&&bText)
{
SendMessage(hEdit,EM_GETLINE,0,(LPARAM)lpString);
TextOut(hdc,LOWORD(lParam),HIWORD(lParam),lpString,strlen(lpString));
TextOut(hdc1,LOWORD(lParam),HIWORD(lParam),lpString,strlen(lpString));
b=false;
bText=false;
}
break;
case WM_PAINT:
hdc2 = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
hEnhMtf=CloseEnhMetaFile(hdc1);
GetEnhMetaFileHeader(hEnhMtf,sizeof(ENHMETAHEADER),&emh);
SetRect(&rect,emh.rclBounds.left,emh.rclBounds.top,emh.rclBounds.right,emh.rclBounds.bottom);
hdc1=CreateEnhMetaFile(NULL,NULL,NULL,NULL);
PlayEnhMetaFile(hdc2,hEnhMtf,&rect);
SelectObject(hdc1,hBrush);
SelectObject(hdc1,hPen);
PlayEnhMetaFile(hdc1,hEnhMtf,&rect);
DeleteEnhMetaFile(hEnhMtf);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
ReleaseDC(hWnd,hdc);
//hEnhMtf=CloseEnhMetaFile(hdc1);
//DeleteEnhMetaFile(hEnhMtf);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
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Работа с метафайлами, Программа виснет при работе с метафайлом 
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