Vector 和 HWND 零内存错误 c++

Question

我想创建多个 windows ..所以与其一遍又一遍地写它们，我决定使用 vector 来保存所有 HWND 的列表并更新它们作为程序 proceeds.But 它似乎没有按预期工作。它给我一个访问冲突错误。

我尝试初始化 vector.But 似乎没有任何效果

WindoManager.h

  #include<windowsx.h>
#include<Windows.h>
#include<vector>
#include<list>
#include<iostream>
using namespace std;


class WindowManager{

    // Constructor
    WindowManager();

    // Destructor
    ~WindowManager();

private:
    vector<HWND> wnds;
    HWND hwnd;

public:
    void CreateNewWindow(HINSTANCE hinst,WNDCLASSEX * ex,HWND * Parent,HWND * ReturnWind,int Width,int Height,int X,int Y);
    void ShowWindows(int);
    int HandleMseeages();

};

WindowManager.cpp

#include"WindowManager.h"

WindowManager::WindowManager()
{


}

void WindowManager::CreateNewWindow(HINSTANCE hinst,WNDCLASSEX * ex,HWND * Parent,HWND * ReturnWind,int Width,int Height,int X,int Y)
{
    if(Parent == NULL)
    {
      hwnd = CreateWindowEx(NULL,ex->lpszClassName,ex->lpszMenuName,WS_OVERLAPPEDWINDOW,X,Y,Width,Height,NULL,NULL,hinst,NULL);
        wnds.push_back(hwnd);
        *ReturnWind = hwnd;
    }
}

void WindowManager::ShowWindows(int show)
{
    for(vector<HWND>::iterator it = wnds.begin();it != wnds.end() ; ++it)
    {
        ShowWindow(*it,show);
    }
}


int WindowManager::HandleMseeages()
{
    MSG msg;

 for(int i=0;i< wnds.size();++i)
    {
        if(PeekMessage(&msg,wnds[i],0,0,PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);

            if(msg.message == WM_QUIT)
                return 0;
        }
    }

 return 1;
}

并且函数从 source.cpp

调用

....//Removed unwanted code

WindowManager * WndManager = {0};

    WndManager->CreateNewWindow(hinst,&classex,NULL,&hwnd,500,500,0,0);
    WndManager->ShowWindows(cmdshow);

我不知道怎么了..请帮帮我

谢谢

Answer 1

试试这个：

WindowManager WndManager{};

WndManager.CreateNewWindow(hinst,&classex,NULL,&hwnd,500,500,0,0);
WndManager.ShowWindows(cmdshow);

Answer 2

问题似乎出在这一行：

WindowManager * WndManager = {0};

您声明了一个指针，但没有分配对象并调用它的构造函数。

分配对象为：

WindowManager * WndManager = new WindowManager;

或者只是简单地在堆栈中定义它并使用正确的调用（如 Richard Hodges 所建议）：

WindowManager WndManager;

WndManager.CreateNewWindow(hinst,&classex,NULL,&hwnd,500,500,0,0);
WndManager.ShowWindows(cmdshow);

Vector 和 HWND 零内存错误 c++

Vector and HWND Zero memory error c++

c++

windows

winapi

vector

hwnd