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  1. #1
    Join Date
    Apr 2020
    Posts
    3

    [RESOLVED] Problem with text in GetWindowText function

    Hi,

    I am starting a simple WinApi project in Dev C++. I know it's an alo compiler, but I really like it. So, I made everything, window is working just fine, exept for a text message on MessageBox. When I type something like "Hello" in a text field, program displays Message box with some strange message (every time I start program it is a complitely diferent message) like: ž{}äös.

    Here is the code of a program:
    Code:
    #include <windows.h>
    
    /* This is where all the input to the window goes to */
    LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) {
    
        HWND TextBox, Button;
    
        
    	switch(Message) {
    		
    		case WM_CREATE:
    			TextBox=CreateWindow("EDIT", "", WS_BORDER|WS_CHILD|WS_VISIBLE|WS_VSCROLL|ES_MULTILINE|ES_AUTOVSCROLL , 10, 10, 400, 400, hwnd, NULL, NULL, NULL);
    			Button=CreateWindow("Button", "Dede", WS_VISIBLE|WS_CHILD|WS_BORDER, 420,20,70, 20, hwnd, (HMENU) 1, NULL, NULL);
    			
    			break;
    			
    		case WM_COMMAND:
    				switch(LOWORD(wParam))
    			{
    				case 1:
                        char textSaved[20];
                     //   char *t= &textSaved[0];
    					int gwtstat=GetWindowTextLength(TextBox);
    					GetWindowText(TextBox, textSaved, gwtstat);
    
    					::MessageBox(hwnd, textSaved, "Title", MB_OK);
    				break;
    			}
    		
    			 break;
    		/* Upon destruction, tell the main thread to stop */
    		case WM_DESTROY: {
    			PostQuitMessage(0);
    			break;
    		}
    		
    		/* All other messages (a lot of them) are processed using default procedures */
    		default:
    			return DefWindowProc(hwnd, Message, wParam, lParam);
    	}
    	return 0;
    }
    
    /* The 'main' function of Win32 GUI programs: this is where execution starts */
    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    	WNDCLASSEX wc; /* A properties struct of our window */
    	HWND hwnd; /* A 'HANDLE', hence the H, or a pointer to our window */
    	MSG msg; /* A temporary location for all messages */
    
    	/* zero out the struct and set the stuff we want to modify */
    	memset(&wc,0,sizeof(wc));
    	wc.cbSize		 = sizeof(WNDCLASSEX);
    	wc.lpfnWndProc	 = WndProc; /* This is where we will send messages to */
    	wc.hInstance	 = hInstance;
    	wc.hCursor		 = LoadCursor(NULL, IDC_ARROW);
    	
    	/* White, COLOR_WINDOW is just a #define for a system color, try Ctrl+Clicking it */
    	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    	wc.lpszClassName = "WindowClass";
    	wc.hIcon		 = LoadIcon(NULL, IDI_APPLICATION); /* Load a standard icon */
    	wc.hIconSm		 = LoadIcon(NULL, IDI_APPLICATION); /* use the name "A" to use the project icon */
    
    	if(!RegisterClassEx(&wc)) {
    		MessageBox(NULL, "Window Registration Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
    		return 0;
    	}
    
    	hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"WindowClass","Caption",WS_VISIBLE|WS_OVERLAPPEDWINDOW,
    		CW_USEDEFAULT, /* x */
    		CW_USEDEFAULT, /* y */
    		640, /* width */
    		480, /* height */
    		NULL,NULL,hInstance,NULL);
    
    	if(hwnd == NULL) {
    		MessageBox(NULL, "Window Creation Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
    		return 0;
    	}
    
    	/*
    		This is the heart of our program where all input is processed and 
    		sent to WndProc. Note that GetMessage blocks code flow until it receives something, so
    		this loop will not produce unreasonably high CPU usage
    	*/
    	while(GetMessage(&msg, NULL, 0, 0) > 0) { /* If no error is received... */
    		TranslateMessage(&msg); /* Translate key codes to chars if present */
    		DispatchMessage(&msg); /* Send it to WndProc */
    	}
    	return msg.wParam;
    }

    So, if anybody could help...tnx!
    Last edited by VictorN; April 26th, 2020 at 04:01 PM. Reason: added CODE tags

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