创建800*600的画布

main.cpp

@@ -55,15 +55,17 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	int windowWidth = 800;
 	int windowHeight = 600;
 
+	RECT rect;
+	rect.left = 0;
+	rect.right = windowWidth;
+	rect.bottom = windowHeight;
+	rect.top = 0;
+
+	AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, false);
+
 	//窗口名称一定要和刚才注册窗口的保持一致
 	HWND hwnd = CreateWindowEx(NULL, L"GLWindow", L"OpenGL Window", WS_OVERLAPPEDWINDOW, 100, 100, windowWidth, windowHeight, NULL, NULL, hinstance, NULL);
 
-	//获取实际窗口大小
-	RECT rect;
-	GetClientRect(hwnd, &rect);
-	windowWidth = rect.right - rect.left;
-	windowHeight = rect.bottom - rect.top;
-
 	//设置渲染环境
 	HDC dc = GetDC(hwnd);//获取设备上下文
 	PIXELFORMATDESCRIPTOR pfd;