WndProc作为成员函数崩溃.

问题描述

我遵循了一些教程，以将WndProc作为成员函数包含在主窗口的类中，但是，我的程序不断收到未处理的异常，并且我无法弄清楚是什么原因引起的.我试图尽最大努力了解文档 我的能力，但我想我缺少了一些东西.我在WndProc中的switch语句中发现程序达到默认情况时崩溃.我在该区域中有一个消息框来表明这一点.我的假设是这有一些 与传递给:: DefWindowProc(...)的hwnd指针有关.

I followed some tutorials to get WndProc included as a member function to my main window's class, however, my program keep getting an un-handled exception, and I can't figure out what is causing it. I tried to understand the documentation to the best of my ability, but I think I am missing something. I have identified the program crashing when it reaches the default case in my switch statement inside my WndProc. I have message boxes in the area to indicate this. My assumptions are that this has something to do with the hwnd pointer passed to ::DefWindowProc(...).

下面是我的代码.请帮助我了解我在做什么错.将我指向文档或其他内容.

Below is my code. Please help me to understand what I am doing wrong. Point me to documentation or something.

#include <windows.h>

class DXWindow
{
public:
	DXWindow(HINSTANCE hInstance, LPCTSTR className);
	~DXWindow();
	WNDCLASSEX* get_WNDCLASSEX();
	bool RegClassEx();
	bool CrteWindowEx(HINSTANCE hInstance, LPCTSTR className, int nCmdShow);
private:
	WNDCLASSEX* wcex;
	HWND hWnd;
	LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
	static LRESULT CALLBACK StaticWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
};

#include "DXWindow.h"
#include <stdlib.h>
#include <stdio.h>

DXWindow::DXWindow(HINSTANCE hInstance, LPCTSTR className)
{
	this->wcex->cbSize		  = sizeof(WNDCLASSEX);
  this->wcex->style     = CS_HREDRAW | CS_VREDRAW;
	this->wcex->lpfnWndProc  = StaticWndProc;
  this->wcex->cbClsExtra   = 0;
  this->wcex->cbWndExtra   = 0;
  this->wcex->hInstance   = hInstance;
  this->wcex->hIcon     = 0;
  this->wcex->hCursor    = 0;
  this->wcex->hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
  this->wcex->lpszMenuName  = 0;
  this->wcex->lpszClassName = className;
  this->wcex->hIconSm    = 0;
}

DXWindow::~DXWindow()
{
}

WNDCLASSEX* DXWindow::get_WNDCLASSEX()
{
	return this->wcex;
}

LRESULT CALLBACK DXWindow::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch (msg)
	{
		case WM_CREATE:
		{
			char status1[512];
			sprintf_s(status1, "WMCreate Called");
			MessageBox(0, status1, status1, MB_OK);
		}
		default:
		{
			char status1[512];
			sprintf_s(status1, "Default case reached");
			MessageBox(0, status1, status1, MB_OK);
			return DefWindowProc(hWnd, msg, wParam, lParam);
		}
	}
	return 0;
}

LRESULT CALLBACK DXWindow::StaticWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	DXWindow* pDXWindow = (DXWindow*)GetWindowLong(hWnd, GWL_USERDATA);
	return pDXWindow->WndProc(hWnd, uMsg, wParam, lParam);
}

bool DXWindow::RegClassEx()
{
	if(!::RegisterClassEx(wcex))
	{
		char error[512];
		sprintf_s(error, "Failed to register class");
		MessageBox(0, error, error, MB_OK);
		exit(0);
	}
	else
	{
		char sucess[512];
		sprintf_s(sucess, "Registerd dxwindow");
		MessageBox(0, sucess, sucess, MB_OK);
	}
	return TRUE;
}

bool DXWindow::CrteWindowEx(HINSTANCE hInstance, LPCTSTR className, int nCmdShow)
{
	hWnd = ::CreateWindowEx(
					WS_EX_CLIENTEDGE,
					className,
					"DXWindow",
					WS_OVERLAPPEDWINDOW,
					CW_USEDEFAULT,
					CW_USEDEFAULT,
					200,
					200,
					NULL,
					NULL,
          hInstance,
					NULL);

  if(!hWnd)
	{
		char error[512];
		sprintf_s(error, "Failed to create DXWindow");
		MessageBox(0, error, error, MB_OK);
		exit(0);
	}
	else
	{
		char sucess[512];
		sprintf_s(sucess, "Created dxwindow");
		MessageBox(0, sucess, sucess, MB_OK);
	}

	ShowWindow(hWnd, nCmdShow);
	return TRUE;
}

#include <windows.h>
#include "DXWindow.h"

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pCmdLine, int nCmdShow)
{
	DXWindow* dxwnd = new DXWindow(hInstance, "DXWindow");
	dxwnd->RegClassEx();
	dxwnd->CrteWindowEx(hInstance, "DXWindow", nCmdShow);

	return 0;
}

推荐答案

使用 WNDCLASSEX wcex 或将其本地放置在 DXWindow中和 RegisterClassEx 也在其中.

Use WNDCLASSEX wcex or place it locally in DXWindowand RegisterClassEx also in it.

这篇关于WndProc作为成员函数崩溃.的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！