0xC0000005:访问冲突读取位置0x0000000000000000.C++

Question

我正在做的事情遇到了一个非常烦人的问题。我已经尝试了许多解决方案，研究此错误无助于解决我的确切问题。有人能帮忙吗？我已经在下面包含了我的叠加层.cpp...

#include "Overlay.h"
Overlay::Overlay() {
m_hWnd = NULL;
m_hGame = NULL;
m_pDirect3D = nullptr;
m_pDevice = nullptr;
memset(&m_Present, NULL, sizeof(D3DPRESENT_PARAMETERS));
}
Overlay::~Overlay() {
if (m_pDevice) {
    m_pDevice->Release();
    m_pDevice = nullptr;
}
if (m_pDirect3D) {
    m_pDirect3D->Release();
    m_pDirect3D = nullptr;
}
}
bool Overlay::Attach(HWND hWnd) {
m_hGame = hWnd;
if (!m_hGame) {
    return false;
}
RECT client;
GetClientRect(m_hGame, &client);
m_nSize[0] = client.right;
m_nSize[1] = client.bottom;
WNDCLASSEX wc = { NULL };
wc.cbSize           = sizeof(WNDCLASSEX);
wc.style            = CS_VREDRAW | CS_HREDRAW;
wc.lpfnWndProc      = WndProcedure;
wc.cbClsExtra       = NULL;
wc.cbWndExtra       = NULL;
wc.hInstance        = NULL;
wc.hIcon            = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor          = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground    = (HBRUSH)COLOR_WINDOW;
wc.lpszMenuName     = NULL;
wc.lpszClassName    = OVERLAY_NAME;
wc.hIconSm          = LoadIcon(NULL, IDI_APPLICATION);
if (!RegisterClassEx(&wc)) {
    return false;
}
m_hWnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_COMPOSITED | WS_EX_TRANSPARENT | WS_EX_LAYERED, OVERLAY_NAME, OVERLAY_NAME, WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT, m_nSize[0], m_nSize[1], NULL, NULL, NULL, NULL);
if (!m_hWnd) {
    return false;
}
MARGINS margin = { -1, -1, -1, -1 };
DwmExtendFrameIntoClientArea(m_hWnd, &margin);
ShowWindow(m_hWnd, SW_SHOWDEFAULT);
UpdateWindow(m_hWnd);
RECT game;
GetWindowRect(m_hGame, &game);
RECT cl;
GetClientRect(m_hGame, &cl);
int w = game.right - game.left;
int h = game.bottom - game.top;
LONG_PTR dwStyle = GetWindowLongPtr(m_hGame, GWL_STYLE);
if (dwStyle & WS_BORDER) {
    int x = GetSystemMetrics(SM_CXBORDER);
    int y = GetSystemMetrics(SM_CYCAPTION) + GetSystemMetrics(SM_CYBORDER);
    game.left += x;
    game.top += y;
    w -= x;
    h -= y;
}
MoveWindow(m_hWnd, game.left, game.top, w, h, TRUE);
m_nSize[0] = w;
m_nSize[1] = h;
return InitDirectX();
}
int Overlay::OnFrame() {
MSG msg;
while (true) {
    Sleep(1);
    if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
        if (msg.message == WM_QUIT) {
            break;
        }
        TranslateMessage(&msg);
        DispatchMessageA(&msg);
    } else {
        m_pDevice->Clear(NULL, NULL, D3DCLEAR_TARGET, NULL, 1.0f, NULL);
        m_pDevice->BeginScene();
        if (!m_pOnFrameList.empty()) {
            for (auto& pOnFrame : m_pOnFrameList) {
                if (pOnFrame) {
                    pOnFrame();
                }
            }
        }
        m_pDevice->EndScene();
        m_pDevice->Present(NULL, NULL, NULL, NULL);
    }
}
return (int)msg.wParam;
}
void Overlay::AddOnFrame(const OnFrameFn& pFunction) {
m_pOnFrameList.push_back(pFunction);
}
void Overlay::GetScreenSize(int* width, int* height) {
if (width) {
    *width = m_nSize[0];
}
if (height) {
    *height = m_nSize[1];
}
}
IDirect3DDevice9* Overlay::GetDevice() const {
return m_pDevice;
}
bool Overlay::InitDirectX() {
m_Present.EnableAutoDepthStencil    = TRUE;
m_Present.AutoDepthStencilFormat    = D3DFMT_D16;
m_Present.Windowed                  = TRUE;
m_Present.BackBufferCount           = 1;
m_Present.BackBufferFormat          = D3DFMT_A8R8G8B8;
m_Present.BackBufferWidth           = m_nSize[0];
m_Present.BackBufferHeight          = m_nSize[1];
m_Present.MultiSampleType           = D3DMULTISAMPLE_NONE;
m_Present.SwapEffect                = D3DSWAPEFFECT_DISCARD;
m_Present.PresentationInterval      = D3DPRESENT_INTERVAL_IMMEDIATE;
m_Present.hDeviceWindow             = m_hWnd;
m_pDirect3D = Direct3DCreate9(D3D_SDK_VERSION);
if (!m_pDirect3D) {
    return false;
}
if (FAILED(m_pDirect3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, m_hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &m_Present, &m_pDevice))) {
    return false;
}
if (!m_pDevice) {
    return false;
}
return true;
}
LRESULT WINAPI Overlay::WndProcedure(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
switch (message) {
case WM_DESTROY:
    PostQuitMessage(NULL);
    break;
default:
    return DefWindowProc(hWnd, message, wParam, lParam);
}
return NULL;
}

我的错误发生在这一行m_pDevice->Clear(NULL, NULL, D3DCLEAR_TARGET, NULL, 1.0f, NULL);

任何帮助将不胜感激

Answer 1

NULL 表示0x0。所以你可能正在将 NULL 传递给 m_pDevice->Clear（） 它将被读取。

此外，请确保m_pDevice不是空。