[C++] GDI+ - Zeichnen ohne WM_PAINT Message

**Xorianator**

Hey Leute,
ich mache aktuell das Tutorial von MSDN zu GDI+ http://msdn.microsoft.com/en-us/library/…2(v=VS.85).aspx, nun tut sich aber folgendes Problem auf:
Während ich das Fenster ausserhalb des Bildschirms ziehe, minimiere oder ... wird es neu gezeichnet.
Jedoc nicht, während es starr und steif im Bildschirm rumhöngt.
Mit GetAsyncKeyState() habe ich Koordinaten für Punkte verändert, das zeichnet sich aber nur dann neu, wenn ich das Fenster schließe, minimiere oder irgendwas anderes.

Nun, der Codeauszug ist ganz simpel:

Spoiler anzeigen

PHP

#include <stdafx.h>
#include <windows.h>
#include <objidl.h>
#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment (lib,"Gdiplus.lib")


VOID OnPaint(HDC hdc)
{
   Graphics graphics(hdc);
   Pen      pen(Color(255, 0, 0, 255));
   graphics.DrawLine(&pen, 0, 0, 200, 100);
}


LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow)
{
   HWND                hWnd;
   MSG                 msg;
   WNDCLASS            wndClass;
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR           gdiplusToken;

   // Initialize GDI+.
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   wndClass.style          = CS_HREDRAW | CS_VREDRAW;
   wndClass.lpfnWndProc    = WndProc;
   wndClass.cbClsExtra     = 0;
   wndClass.cbWndExtra     = 0;
   wndClass.hInstance      = hInstance;
   wndClass.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
   wndClass.hCursor        = LoadCursor(NULL, IDC_ARROW);
   wndClass.hbrBackground  = (HBRUSH)GetStockObject(WHITE_BRUSH);
   wndClass.lpszMenuName   = NULL;
   wndClass.lpszClassName  = TEXT("GettingStarted");

   RegisterClass(&wndClass);

   hWnd = CreateWindow(
      TEXT("GettingStarted"),   // window class name
      TEXT("Getting Started"),  // window caption
      WS_OVERLAPPEDWINDOW,      // window style
      CW_USEDEFAULT,            // initial x position
      CW_USEDEFAULT,            // initial y position
      CW_USEDEFAULT,            // initial x size
      CW_USEDEFAULT,            // initial y size
      NULL,                     // parent window handle
      NULL,                     // window menu handle
      hInstance,                // program instance handle
      NULL);                    // creation parameters

   ShowWindow(hWnd, iCmdShow);
   UpdateWindow(hWnd);

   while(GetMessage(&msg, NULL, 0, 0))
   {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }

   GdiplusShutdown(gdiplusToken);
   return msg.wParam;
}  // WinMain


LRESULT CALLBACK WndProc(HWND hWnd, UINT message, 
   WPARAM wParam, LPARAM lParam)
{
   HDC          hdc;
   PAINTSTRUCT  ps;

   switch(message)
   {
   case WM_PAINT:
      hdc = BeginPaint(hWnd, &ps);
      OnPaint(hdc);
      EndPaint(hWnd, &ps);
      return 0;
   case WM_DESTROY:
      PostQuitMessage(0);
      return 0;
   default:
      return DefWindowProc(hWnd, message, wParam, lParam);
   } 
} // WndProc

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Nunja, die letztendliche frage: Wie aktualisiere ich denn das Bild ohne das Fenster zu bewegen, wäre für ein game ganz interessant ...
MfG

progandy

Es gibt eine nette Funktion namens RedrawWindow, die mit den richtigen Parametern ein WM_PAINT durchführt.

**Xorianator**

@progandy; was ist denn das Parameter, bzw wo muss ich das hinklatschen ?
Ich hab das jetzt so hingesetzt:

PHP

#include "OnPaint.h"




LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow)
{
   HWND                hWnd;
   MSG                 msg;
   WNDCLASS            wndClass;
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR           gdiplusToken;

   // Initialize GDI+.
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   wndClass.style          = CS_HREDRAW | CS_VREDRAW;
   wndClass.lpfnWndProc    = WndProc;
   wndClass.cbClsExtra     = 0;
   wndClass.cbWndExtra     = 0;
   wndClass.hInstance      = hInstance;
   wndClass.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
   wndClass.hCursor        = LoadCursor(NULL, IDC_ARROW);
   wndClass.hbrBackground  = (HBRUSH)GetStockObject(WHITE_BRUSH);
   wndClass.lpszMenuName   = NULL;
   wndClass.lpszClassName  = TEXT("GettingStarted");

   RegisterClass(&wndClass);

   hWnd = CreateWindow(
      TEXT("GettingStarted"),   // window class name
      TEXT("Getting Started"),  // window caption
      WS_OVERLAPPEDWINDOW,      // window style
      CW_USEDEFAULT,            // initial x position
      CW_USEDEFAULT,            // initial y position
      500,            // initial x size
      500,            // initial y size
      NULL,                     // parent window handle
      NULL,                     // window menu handle
      hInstance,                // program instance handle
      NULL);                    // creation parameters
	  RECT Rect;
	  Rect.left = 0;
	  Rect.top = 0;
	  Rect.bottom = 500;
	  Rect.right = 500;
   ShowWindow(hWnd, iCmdShow);
   UpdateWindow(hWnd);

   while(GetMessage(&msg, NULL, 0, 0))
   {
		if (GetAsyncKeyState(0x57)){
		  PosY -= 1;
	  }
	  if (GetAsyncKeyState(0x53)){
		  PosY += 1;
	  }
	  TranslateMessage(&msg);
	  RedrawWindow(hWnd, NULL, NULL, RDW_UPDATENOW);
      DispatchMessage(&msg);
   }

   GdiplusShutdown(gdiplusToken);
   return msg.wParam;
}  // WinMain


LRESULT CALLBACK WndProc(HWND hWnd, UINT message, 
   WPARAM wParam, LPARAM lParam)
{
   HDC          hdc;
   PAINTSTRUCT  ps;

   switch(message)
   {
   case WM_PAINT:
      hdc = BeginPaint(hWnd, &ps);
      OnPaint(hdc);
      EndPaint(hWnd, &ps);
      return 0;
   case WM_DESTROY:
      PostQuitMessage(0);
      return 0;
   default:
	  RedrawWindow(hWnd, NULL, NULL, RDW_INTERNALPAINT);
      return DefWindowProc(hWnd, message, wParam, lParam);
   }
} // WndProc

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progandy

So in etwa: (UPDATENOW solltest du nicht verwenden, da du ja im Messageloop die Nachricht absendest. Ansonsten müsstest du einen extra Thread für die Eingabeabfrage erstellen.

PHP

boolean changed = false;
   while(GetMessage(&msg, NULL, 0, 0))
   {
      if (GetAsyncKeyState(0x57)){
          PosY -= 1;
          changed = true;
      }
      if (GetAsyncKeyState(0x53)){
          PosY += 1;
          changed = true;
      }
      if (changed) {
          RedrawWindow(hWnd, NULL, NULL, RDW_INTERNALPAINT);
          changed = false;
     }
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }

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**Xorianator**

Nein, ich muss dich enttäuschen, das ganze funktioniert nicht ...
Mein Script:

Spoiler anzeigen

PHP

#include "OnPaint.h"




LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow)
{
   HWND                hWnd;
   MSG                 msg;
   WNDCLASS            wndClass;
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR           gdiplusToken;

   // Initialize GDI+.
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   wndClass.style          = CS_HREDRAW | CS_VREDRAW;
   wndClass.lpfnWndProc    = WndProc;
   wndClass.cbClsExtra     = 0;
   wndClass.cbWndExtra     = 0;
   wndClass.hInstance      = hInstance;
   wndClass.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
   wndClass.hCursor        = LoadCursor(NULL, IDC_ARROW);
   wndClass.hbrBackground  = (HBRUSH)GetStockObject(WHITE_BRUSH);
   wndClass.lpszMenuName   = NULL;
   wndClass.lpszClassName  = TEXT("GettingStarted");

   RegisterClass(&wndClass);

   hWnd = CreateWindow(
      TEXT("GettingStarted"),   // window class name
      TEXT("Getting Started"),  // window caption
      WS_OVERLAPPEDWINDOW,      // window style
      CW_USEDEFAULT,            // initial x position
      CW_USEDEFAULT,            // initial y position
      500,            // initial x size
      500,            // initial y size
      NULL,                     // parent window handle
      NULL,                     // window menu handle
      hInstance,                // program instance handle
      NULL);                    // creation parameters
	  RECT Rect;
	  Rect.left = 0;
	  Rect.top = 0;
	  Rect.bottom = 500;
	  Rect.right = 500;
   ShowWindow(hWnd, iCmdShow);
   UpdateWindow(hWnd);
   bool changed = false;
   while(GetMessage(&msg, NULL, 0, 0))
   {
      if (GetAsyncKeyState(0x57)){
          PosY -= 1;
          changed = true;
      }
      if (GetAsyncKeyState(0x53)){
          PosY += 1;
          changed = true;
      }
      if (changed) {
			HDC          hdc;
			PAINTSTRUCT  ps;
			hdc = BeginPaint(hWnd, &ps);
			OnPaint(hdc);
			EndPaint(hWnd, &ps);
			RedrawWindow(hWnd, NULL, NULL, RDW_INTERNALPAINT);
			changed = false;
     }
	  TranslateMessage(&msg);
      DispatchMessage(&msg);
   }

   GdiplusShutdown(gdiplusToken);
   return msg.wParam;
}  // WinMain


LRESULT CALLBACK WndProc(HWND hWnd, UINT message, 
   WPARAM wParam, LPARAM lParam)
{
   HDC          hdc;
   PAINTSTRUCT  ps;
   switch(message)
   {
   case WM_PAINT:
      hdc = BeginPaint(hWnd, &ps);
      OnPaint(hdc);
      EndPaint(hWnd, &ps);
      return 0;
   case WM_DESTROY:
      PostQuitMessage(0);
      return 0;
   default:
      return DefWindowProc(hWnd, message, wParam, lParam);
   }
} // WndProc

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**Oscar**

[verschoben nach "Andere Programmiersprachen"]