我正在关注http://nehe.gamedev.net/tutorial/creating_an_opengl_window_(win32)/13001/ OpenGL教程,我从那里得到了代码。现在,我试图通过使用多个类来组织事物。当我创建这个类时,我无法释放设备上下文,HWND,我无法取消注册Windows类。下面的代码是用于检查是否可以释放它们的代码:
GLvoid KillGLWindow(GLvoid){
if (fullscreen){
ChangeDisplaySettings(NULL, 0);
ShowCursor(true);
}
if (hRC){
if (!wglMakeCurrent(NULL, NULL)){
MessageBox(NULL, "Release of DC and RC failed", "Shutdown error", MB_OK | MB_ICONINFORMATION);
}
if (!wglDeleteContext(hRC)){
MessageBox(NULL, "Release of RC failed", "Shutdown error", MB_OK | MB_ICONEXCLAMATION);
}
hRC = NULL;
}
if (hDC && !ReleaseDC(hWnd, hDC)){
MessageBox(NULL, "Release of DC failed", "Shutdown error", MB_OK | MB_ICONINFORMATION);
hDC = NULL;
}
if (hWnd && !DestroyWindow(hWnd)){
MessageBox(NULL, "Release of hWnd failed", "Shutdown error", MB_OK | MB_ICONINFORMATION);
hWnd = NULL;
}
if (!UnregisterClass("OpenGL", hInstance)){
MessageBox(NULL, "Could not unregister window class", "Shutdown error", MB_OK | MB_ICONINFORMATION);
hInstance = NULL;
}
}
(最后三个如果法庭被解雇)
我正在移动的代码导致这些错误是WinMain函数中的关键检测代码。这是我改变的唯一代码。
else{
if (active){
if (testKey.isEsc()){
done = true;
}
if (testKey.isA()){
KillGLWindow();
}
else{
DrawGLScene();
SwapBuffers(hDC);
}
}
if (testKey.isF1()){
//Keys::keys[VK_F1] = false;
KillGLWindow();
fullscreen = !fullscreen;
if (!CreateGLWindow("XcoxGL", 640, 480, 16, fullscreen)){
return 0;
}
}
我改变的是testKey.THING部分。 testKey在主类中由行
启动Keys testKey
Keys.cpp看起来像这样:
bool Keys::keys[256] = { false };
bool Keys::isA(){
if (&keys[0x41]){
return true;
}
else{
return false;
}
}
bool Keys::isF1(){
if (&keys[VK_F1]){
return true;
}
else{
return false;
}
}
bool Keys::isEsc(){
if (&keys[VK_ESCAPE]){
return true;
}
else{
return false;
}
}
最后,Keys.h看起来像这样:
#pragma once
class Keys{
public:
static bool keys[256];
bool isA();
bool isF1();
bool isEsc();
};
如果您愿意,我可以发布完整的代码,但是我在上面发布的教程中显示并解释了创建DC和HWND的方式。
有没有人知道我的密码中是什么导致我的DC和HWND无法释放?
答案 0 :(得分:0)
可能KillGLWindow不止一次被调用,而且不是很合适,试试这个:
GLvoid KillGLWindow(GLvoid){
if (fullscreen){
ChangeDisplaySettings(NULL, 0);
ShowCursor(true);
}
if (hRC){
if (!wglMakeCurrent(NULL, NULL)){
MessageBox(NULL, "Release of DC and RC failed", "Shutdown error", MB_OK | MB_ICONINFORMATION);
}
if (!wglDeleteContext(hRC)){
MessageBox(NULL, "Release of RC failed", "Shutdown error", MB_OK | MB_ICONEXCLAMATION);
}
}
hRC = NULL;
if (hDC && !ReleaseDC(hWnd, hDC)){
MessageBox(NULL, "Release of DC failed", "Shutdown error", MB_OK | MB_ICONINFORMATION);
}
hDC = NULL;
if (hWnd && !DestroyWindow(hWnd)){
MessageBox(NULL, "Release of hWnd failed", "Shutdown error", MB_OK | MB_ICONINFORMATION);
}
hWnd = NULL;
if (hInstance && !UnregisterClass("OpenGL", hInstance)){
MessageBox(NULL, "Could not unregister window class", "Shutdown error", MB_OK | MB_ICONINFORMATION);
}
hInstance = NULL;
}