好的,我可以理解函数是否会返回错误或抛出异常,但由于某种原因,我对DestroyWindow的调用会在那时退出程序。与实际的exit()函数一样,改变我的程序流程。文档提到没有这样的东西,我没有办法弄清楚是什么,因为我没有错误代码。有没有人遇到过这样的事情?
我使用这个对象比使用winapi要多得多,所以忽略其余部分。还有什么可能是错的?
SYNC_WinSystem.h
#ifndef SYNC_WINSYSTEM_H
#define SYNC_WINSYSTEM_H
#include "SYNC_ISystem.h"
#include <Windows.h>
#include <array>
#include "SYNC_Winput.h"
#include "SYNC_IRenderer.h"
#include "SYNC_D3D11Renderer.h"
#define FULL_SCREEN true
// SYNC_WinSystem
class SYNC_WinSystem : public SYNC_ISystem
{
public:
class WindowsContext;
SYNC_WinSystem();
virtual long Initialize(InitializeContext *);
virtual void Init_Loop();
virtual void Shutdown();
virtual long MakeDirectory(std::string);
virtual bool CreateSkin(std::string, std::string, SYNC::ISkin *&);
virtual ISound * CreateSound();
LRESULT CALLBACK MessageHandler(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
private:
virtual long InitializeWindows();
virtual bool Frame();
virtual void ShutdownWindows();
private:
SYNC_Winput m_Input;
private:
std::shared_ptr<SYNC_IRenderer> m_Graphics;
HINSTANCE m_hinstance;
HWND m_hwnd;
int m_screenWidth;
int m_screenHeight;
std::string m_WindowName;
};
// SYNC_WinSystem::WindowsContext
class SYNC_WinSystem::WindowsContext : public SYNC_ISystem::InitializeContext
{
public:
WindowsContext();
std::string Type();
HINSTANCE m_hinstance;
std::string m_WindowName;
private:
const static std::string m_Identifier;
};
#endif
SYNC_WinSystem.cpp
#include "SYNC_WinSystem.h"
// SYNC_WinSystem definitions
SYNC_WinSystem * g_windows;
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
SYNC_WinSystem::SYNC_WinSystem()
: m_Graphics(new SYNC_D3D11Renderer)
{
m_hinstance = nullptr;
m_hwnd = nullptr;
m_screenWidth = 0;
m_screenHeight = 0;
}
long SYNC_WinSystem::Initialize(InitializeContext * context)
{
long result = 0;
char errors[256];
WindowsContext * cContext;
if(context->Type() == "WindowsContext")
cContext = static_cast<WindowsContext *>(context);
else
return false;
m_hinstance = cContext->m_hinstance;
m_WindowName = cContext->m_WindowName;
g_windows = this;
result = InitializeWindows();
if(result)
{
sprintf_s(errors, "The Window could not initialize. Windows error code: %i", result);
MessageBox(NULL, errors, "Error!", MB_OK);
return result;
}
std::array<std::string, 3> folderNames=
{{
"Compiled_Models",
"Temp_Models",
"Materials"
}};
for(int i = 0; i < (int) folderNames.size(); i++)
{
result = MakeDirectory(folderNames[i]);
if( result && (result != ERROR_ALREADY_EXISTS))
{
sprintf_s(errors, "Error creating directory \" %s \" for system. Windows error code: %i", folderNames[i].c_str(), result);
MessageBox(NULL, errors, "Error!", MB_OK);
return result;
}
result = 0;
}
SYNC_D3D11Renderer::D3D11Context graphicsContext;
graphicsContext.fullscreen = true;
graphicsContext.hwnd = m_hwnd;
graphicsContext.screenDepth = 1000.0f;
graphicsContext.screenNear = 0.1f;
graphicsContext.screenWidth = m_screenWidth;
graphicsContext.screenHeight = m_screenHeight;
if(!m_Graphics->Initialize(&graphicsContext))
return false;
return result;
}
void SYNC_WinSystem::Init_Loop()
{
MSG msg;
bool done, result;
ZeroMemory(&msg, sizeof(MSG));
done = false;
while(!done)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
if(m_Input.IsKeyPressed(VK_ESCAPE))
{
done = true;
}
else
{
result = Frame();
if(!result)
{
done = true;
}
}
}
}
void SYNC_WinSystem::Shutdown()
{
ShutdownWindows();
}
long SYNC_WinSystem::MakeDirectory(std::string dirName)
{
DWORD result = 0;
long returnValue = 0;
dirName.insert(0, ".\\");
result = CreateDirectory(dirName.c_str(), NULL);
if(result == 0)
{
returnValue = GetLastError();
}
return returnValue;
}
bool SYNC_WinSystem::Frame()
{
if(!m_Graphics->Frame())
return false;
return true;
}
long SYNC_WinSystem::InitializeWindows()
{
DWORD result = 0;
WNDCLASSEX wc;
DEVMODE dmScreenSettings;
int posX, posY;
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wc.lpfnWndProc = &WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = m_hinstance;
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wc.hIconSm = wc.hIcon;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) GetStockObject(BLACK_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = m_WindowName.c_str();
wc.cbSize = sizeof(WNDCLASSEX);
if(RegisterClassEx(&wc) == 0)
{
result = GetLastError();
return result;
}
m_screenWidth = GetSystemMetrics(SM_CXSCREEN);
m_screenHeight = GetSystemMetrics(SM_CYSCREEN);
if(FULL_SCREEN)
{
memset(&dmScreenSettings, 0, sizeof(dmScreenSettings));
dmScreenSettings.dmSize = sizeof(dmScreenSettings);
dmScreenSettings.dmPelsWidth = (unsigned long) m_screenWidth;
dmScreenSettings.dmPelsHeight = (unsigned long) m_screenHeight;
dmScreenSettings.dmBitsPerPel = 32;
dmScreenSettings.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN);
posX = posY = 0;
m_hwnd = CreateWindowEx(WS_EX_APPWINDOW,
m_WindowName.c_str(),
m_WindowName.c_str(),
WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_POPUP,
posX, posY, m_screenWidth, m_screenHeight,
NULL, NULL, m_hinstance, NULL);
}
else
{
m_screenWidth = 800;
m_screenHeight = 600;
posX = ((GetSystemMetrics(SM_CXSCREEN)/2) - (m_screenWidth/2));
posY = ((GetSystemMetrics(SM_CYSCREEN)/2) - (m_screenHeight/2));
m_hwnd = CreateWindowEx(WS_EX_APPWINDOW,
m_WindowName.c_str(),
m_WindowName.c_str(),
WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_POPUP,
posX, posY, m_screenWidth, m_screenHeight,
NULL, NULL, m_hinstance, NULL);
}
if(!m_hwnd)
{
result = GetLastError();
return result;
}
ShowWindow(m_hwnd, SW_SHOW);
SetForegroundWindow(m_hwnd);
SetFocus(m_hwnd);
return result;
}
void SYNC_WinSystem::ShutdownWindows()
{
ShowCursor(true);
if(FULL_SCREEN)
{
ChangeDisplaySettings(NULL, 0);
}
if(DestroyWindow(m_hwnd) == 0)
{
char meh[256];
sprintf(meh, "error: %i" , GetLastError());
MessageBox(NULL, meh, "error!", MB_OK);
}
m_hwnd = NULL;
UnregisterClass(m_WindowName.c_str(), m_hinstance);
m_hinstance = NULL;
g_windows = NULL;
return;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
switch(msg)
{
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
}
case WM_CLOSE:
{
PostQuitMessage(0);
return 0;
}
default:
{
return g_windows->MessageHandler(hwnd, msg, wparam, lparam);
}
}
}
LRESULT CALLBACK SYNC_WinSystem::MessageHandler(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
switch(msg)
{
case WM_KEYDOWN:
{
m_Input.KeyDown((unsigned int) wparam);
return 0;
}
case WM_KEYUP:
{
m_Input.KeyDown((unsigned int) wparam);
return 0;
}
default:
{
return DefWindowProc(hwnd, msg, wparam, lparam);
}
}
}
ISound * SYNC_WinSystem::CreateSound()
{
return nullptr;
}
bool SYNC_WinSystem::CreateSkin(std::string filename, std::string shaderName, SYNC::ISkin *& skin)
{
if(!m_Graphics->CreateSkin(filename, shaderName, skin))
return false;
return true;
}
// SYNC_WinSystem::WindowsContext definitions
const std::string SYNC_WinSystem::WindowsContext::m_Identifier = "WindowsContext";
SYNC_WinSystem::WindowsContext::WindowsContext()
{
}
std::string SYNC_WinSystem::WindowsContext::Type()
{
return m_Identifier;
}
快速解释我是如何做到这一点的。窗口句柄和hinstance在对象中有私有成员,在Initialize()和InitializeWindows()函数期间,窗口类和窗口本身被创建。 windows过程在下面定义为全局函数,因为您不能将成员函数用作Windows过程。我通过在顶部创建一个全局指针(gasp)并将其分配给系统的this指针来避开这个,这允许该过程调用成员函数过程。仍然只允许系统的一个实例,但这就是我所需要的:。 Anywho,在关机期间,调用ShutdownWindows(),然后调用DestroyWindow。正是在这次通话中,我的程序只是结束,没有错误,没有例外。 MSVC ++ express告诉我它返回错误代码3,但就Windows错误代码而言,这只是一个ERROR_PATH_NOT_FIND,在这种情况下没有任何意义。任何人都有线索?
的main.cpp
#include <memory>
#include <Windows.h>
#include "Syncopate.h"
#include "SYNC_WinSystem.h"
using namespace std;
#include "SYNC_Winput.h"
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,PSTR lpCmdLine, INT nCmdShow)
{
//create a new instance of the engine
std::shared_ptr<SYNC_WinSystem> system( new SYNC_WinSystem);
// create an init context for this specific derivative of SYNC_ISystem
SYNC_WinSystem::WindowsContext context;
context.m_hinstance = hInstance;
context.m_WindowName = "Syncopate";
// Initialize the system object. if something goes wrong, return ERROR
if(system->Initialize(&context))
return 1;
SYNC::ISkin * model;
if(!system->CreateSkin("data.txt", "ColorShader", model))
return 1;
system->Init_Loop();
system->Shutdown();
return 0;
}
答案 0 :(得分:1)
似乎正在进行的是您处理WM_DESTROY
消息并明确调用PostQuitMessage
。我怀疑正在处理WM_QUIT
消息并导致某种退出。我会看看能否找到更多信息,但到目前为止,这是我的理解。
收到WM_CLOSE
消息后,请致电DestroyWindow
。收到WM_DESTROY
消息后,请致电PostQuitMessage
。由于您使用的是PeekMessage
,因此您将获得WM_QUIT
消息的消息结构。当您找到此消息时,您应该结束循环。
答案 1 :(得分:1)
您的消息循环中没有任何内容会注意到WM_QUIT
并中止。 &#34;标准&#34;消息循环的练习是调用GetMessage()
直到它失败,这表示WM_QUIT
,但您正在调用PeekMessage()
,而WM_QUIT
根本没有处理Frame()
。您的消息循环仅在完成为真时退出,这仅在按下转义或WM_QUIT
调用失败时才会发生。
正如您所发现的,解决方案是重新设计循环以正确处理{{1}}消息,并在循环结束后不调用DestroyWindow。
答案 2 :(得分:0)
IIRC退出代码3是您通过致电abort
获得的。
反正
case WM_CLOSE:
{
PostQuitMessage(0);
return 0;
}
非常不合适(它会终止你的消息循环),并且很可能是你问题的原因。
删除它。
更新:由于上述建议没有改进,我怀疑你在已经被破坏的窗口上调用DestroyWindow
。
作为一项规则,您只应致电DestroyWindow
以回复WM_CLOSE
。对于一般窗口,这是默认处理。所呈现的代码中没有任何迹象(正如我写的那样)表示你的“关闭”代码是如何被调用的,但是由于对WM_CLOSE
和WM_DESTROY
的相同处理,我怀疑它是一个调用放在消息循环之后。
在这种情况下,您确实可能在已经销毁的窗口上调用DestroyWindow
。