Makes Me So Blur!!!

This is a discussion on Makes Me So Blur!!! within the Windows Programming forums, part of the Platform Specific Boards category; hi,guys.here is my question.i want to type a something inside my window but cannot.The problem is,the window pop up everytimes ...

  1. #1
    Mitchell
    Guest

    Unhappy Makes Me So Blur!!!

    hi,guys.here is my question.i want to type a something inside my window but cannot.The problem is,the window pop up everytimes i compiler but when i pressed any keys in my keyboards.The window is closed up already.
    here is my code: pls solve it for me.
    where is the error and problem?
    Solution:i want to enter something inside my window.

    here is the code:
    pls run this program before u make any modification.as it contain two error in it.Thanks.

    #include<windows.h>

    long FAR PASCAL WndProc(HWND ,UINT, WPARAM,LPARAM);

    int PASCAL WinMain(HANDLE hInst,HANDLE hPrevInstance,LPSTR lpszCmdLine,int nCmdShow)
    {
    HWND hWnd;
    MSG msg;
    WNDCLASS wndclass;



    if(!hPrevInstance)
    {
    wndclass.style=0;
    wndclass.lpfnWndProc=(WNDPROC)WndProc;
    wndclass.cbClsExtra=0;
    wndclass.cbWndExtra=0;
    wndclass.hInstance=hInst;
    wndclass.hIcon=LoadIcon(hInst,IDI_APPLICATION);
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground=GetStockObject(WHITE_BRUSH) ;
    wndclass.lpszMenuName=MAKEINTRESOURCE(NULL); wndclass.lpszClassName="MyClass";
    if(!RegisterClass(&wndclass))
    return 0;
    }
    hWnd=CreateWindow("MyClass","Student Pre-App Form",WS_OVERLAPPEDWINDOW,10,10,300,300,NULL,NULL, hInst,NULL);
    ShowWindow(hWnd,nCmdShow);

    while(GetMessage(&msg,0,0,0))
    {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
    }
    return(msg.wParam);
    }

    long FAR PASCAL WndProc(HWND hWnd ,UINT wMessage,WPARAM wParam,LPARAM lParam)
    {
    PAINTSTRUCT ps;
    HDC hDC;
    POINT pt;
    TEXTMETRIC tm;
    static int nCurPos=0;
    static char cBuf[128];
    static int nwidth,nheight;
    static HFONT hFont,hOldFont;

    switch(wMessage)
    {
    case WM_CREATE:
    CreateCaret(hWnd,NULL,10,10);
    ShowCaret(hWnd);
    SetCaretPos(0,0);
    hDC=GetDC(hWnd);
    GetTextMetrics(hDC,&tm);
    ReleaseDC(hWnd,hDC);
    nwidth=tm.tmAveCharWidth;
    nheight=tm.tmHeight;
    }
    break;

    switch(wMessage)
    {
    case WM_PAINT:

    hDC=BeginPaint(hWnd,&ps);
    SetTextColor(hDC,RGB(0,0,255));
    TextOut(hDC,0,0,cBuf,lstrlen(cBuf));
    SelectObject(hDC,hOldFont);
    EndPaint(hWnd,&ps);
    }
    break;
    case WM_CHAR:
    if(nCurPos<127&&(IsCharAlphaNumeric((char)wParam)) )
    {
    cBuf[nCurPos++]=(char)wParam;
    cBuf[nCurPos]=0;
    InvalidateRect(hWnd,NULL,TRUE);
    }
    break;
    case WM_KEYDOWN:
    GetCaretPos(&pt);
    switch(wParam)
    {
    case VK_LEFT:
    pt.x-=nwidth;
    break;
    case VK_RIGHT:
    pt.x+=nwidth;
    break;
    case VK_UP:
    pt.y-=nheight;
    break;
    case VK_DOWN:
    pt.y+=nheight;
    break;
    case VK_HOME:
    pt.y=0;
    pt.x=0;
    break;
    case VK_END:
    pt.y=1;
    pt.x=1;
    break;
    case VK_BACK:
    if(nCurPos>0)
    {
    nCurPos--;
    cBuf[nCurPos]=0;
    InvalidateRect (hWnd,NULL,TRUE);
    }
    break;
    SetCaretPos(pt.x,pt.y);
    break;
    }
    case WM_DESTROY:
    DestroyCaret();
    PostQuitMessage(0);
    break;
    default:
    return DefWindowProc (hWnd,wMessage,wParam,lParam);
    }
    return 0;
    }

  2. #2
    zen
    zen is offline
    of Zen Hall zen's Avatar
    Join Date
    Aug 2001
    Posts
    1,007
    Your wndproc is falling through to WM_DESTROY whenever it gets a WM_KEYDOWN message due to the way you've wriiten your break statements and closing braces. This will allow text input (the only WM_KEYDOWN that has any effect on the text is VK_BACK) -

    Code:
    long FAR PASCAL WndProc(HWND hWnd ,UINT wMessage,WPARAM wParam,LPARAM lParam) 
    { 
    	PAINTSTRUCT ps; 
    	HDC hDC; 
    	POINT pt; 
    	TEXTMETRIC tm; 
    	static int nCurPos=0; 
    	static char cBuf[128]; 
    	static int nwidth,nheight; 
    	static HFONT hFont,hOldFont; 
    
    	switch(wMessage) 
    	{ 
    	case WM_CREATE: 
    	
    		CreateCaret(hWnd,NULL,10,10); 
    		ShowCaret(hWnd); 
    		SetCaretPos(0,0); 
    		hDC=GetDC(hWnd); 
    		GetTextMetrics(hDC,&tm); 
    		ReleaseDC(hWnd,hDC); 
    		nwidth=tm.tmAveCharWidth; 
    		nheight=tm.tmHeight; 
    		break; 
    
    
    	case WM_PAINT: 
    
    		hDC=BeginPaint(hWnd,&ps); 
    		SetTextColor(hDC,RGB(0,0,255)); 
    		TextOut(hDC,0,0,cBuf,lstrlen(cBuf)); 
    		SelectObject(hDC,hOldFont); 
    		EndPaint(hWnd,&ps); 
    		break; 
    
    	case WM_CHAR: 
    		if(nCurPos<127&&(IsCharAlphaNumeric((char)wParam))) 
    		{ 
    			cBuf[nCurPos++]=(char)wParam; 
    			cBuf[nCurPos]=0; 
    			InvalidateRect(hWnd,NULL,TRUE); 
    		} 
    		break; 
    
    	case WM_KEYDOWN: 
    		GetCaretPos(&pt); 
    
    		switch(wParam) 
    		{ 
    		case VK_LEFT: 
    			pt.x-=nwidth; 
    			break; 
    		case VK_RIGHT: 
    			pt.x+=nwidth; 
    			break; 
    		case VK_UP: 
    			pt.y-=nheight; 
    			break; 
    		case VK_DOWN: 
    			pt.y+=nheight; 
    			break; 
    		case VK_HOME: 
    			pt.y=0; 
    			pt.x=0; 
    			break; 
    		case VK_END: 
    			pt.y=1; 
    			pt.x=1; 
    			break; 
    		case VK_BACK: 
    			if(nCurPos>0) 
    			{ 
    				nCurPos--; 
    				cBuf[nCurPos]=0; 
    				InvalidateRect (hWnd,NULL,TRUE); 
    			} 
    			break; 
    		
    		
    		}
    		SetCaretPos(pt.x,pt.y); 
    		break; 
    	
    
    		case WM_DESTROY: 
    			DestroyCaret(); 
    			PostQuitMessage(0); 
    			break; 
    
    		default: 
    			return DefWindowProc (hWnd,wMessage,wParam,lParam); 
    } 
    return 0; 
    }
    zen

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