抛出OpenGLexception：读取访问冲突，窗口为0xCCCCCCCC
我使用的是我在上一个问题中描述的相同框架。
我通过创建一个新的DLL而不是仅仅将项目的构建类型从“Windows应用程序（.exe）”更改为“DLL（.dll）”来解决它。
但是现在当我在我的结构中使用GLFWwindow *类型的变量并尝试写入或读取时。 它总是导致分别弹出写访问或读访问冲突。 exception突然出现，就像窗口开始然后关闭一样，显示exception。
例外情况如下： –
抛出exception：读取访问冲突。
窗口是0xCCCCCCCC。
它发生在GLFW的window.c文件中，它指向尝试读取它的函数。 我甚至尝试使用指针来修改窗口，但它仍然没有用。
这是框架的代码： – 修改！
在window.h
#ifndef LIB_GRAPHICS #define LIB_GRAPHICS #ifdef LIB_EXPORTS #define LIB_EXPORT _declspec(dllexport) #else #define LIB_EXPORT _declspec(dllimport) #endif #define LIB_FALSE 0 #define LIB_TRUE 1 #define LIB_BeginRender LIB_SetEvents(); LIB_ClearToColor #define LIB_EndRender LIB_SwapWindowBuffers #define LIB_CENTER_POSITION 0xCEAAFFEE /* Define other things... */ typedef const char* LIB_String; typedef unsigned LIB_Integer; typedef char LIB_Char; typedef int LIB_Bool; /* Define the structures... */ typedef struct LIB_Window LIB_Window; typedef struct LIB_Color { int r; int g; int b; int a; } LIB_Color; /* Constructors, destructors and other functions... */ LIB_Bool LIB_EXPORT LIB_Initialize(); void LIB_EXPORT LIB_SetEvents(); void LIB_EXPORT LIB_ClearToColor(const LIB_Color color); void LIB_EXPORT LIB_SetFrameColor(const LIB_Color color); LIB_EXPORT LIB_Window* LIB_CreateWindow(const LIB_String title, const int x, const int y, const int width, const int height, const LIB_Bool resizable, const LIB_Bool fullscreen); void LIB_EXPORT LIB_GetDisplaySize(int *width, int *height); void LIB_EXPORT LIB_GetWindowFrameSize(LIB_Window* window, int *width, int *height); void LIB_EXPORT LIB_GetWindowCursorPosition(LIB_Window* window, float *x, float *y); void LIB_EXPORT LIB_GetWindowPosition(LIB_Window* window, int *x, int *y); void LIB_EXPORT LIB_GetWindowSize(LIB_Window* window, int *width, int *height); LIB_String LIB_EXPORT LIB_GetWindowTitle(LIB_Window* window); LIB_Bool LIB_EXPORT LIB_IsWindowFullScreen(LIB_Window* window); LIB_Bool LIB_EXPORT LIB_IsWindowOpened(LIB_Window* window); void LIB_EXPORT LIB_SwapWindowBuffers(LIB_Window* window); void LIB_EXPORT LIB_SetWindowPosition(LIB_Window* window, const int x, const int y); void LIB_EXPORT LIB_SetWindowSize(LIB_Window* window, const int width, const int height); void LIB_EXPORT LIB_SetWindowTitle(LIB_Window * window, const LIB_String title); void LIB_EXPORT LIB_SetFullScreenState(LIB_Window * window, const LIB_Bool fullscreen); void LIB_EXPORT LIB_DestroyWindow(LIB_Window* window); void LIB_EXPORT LIB_Terminate(); #endif /* LIB_GRAPHICS */ window.c
#include "window.h" #define GLEW_STATIC #include #include #include #include /* Create the structures... */ struct LIB_Window { LIB_String title; int x; int y; int width; int height; LIB_Bool fullscreen; GLFWwindow** window; }; /* Start the functions here... */ LIB_Bool LIB_Initialize() { return (LIB_Bool)glfwInit(); } void LIB_SetEvents() { glfwPollEvents(); } void LIB_ClearToColor(const LIB_Color color) { glClearColor((float)color.r / 255, (float)color.g / 255, (float)color.b / 255, (float)color.a / 255); glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); } void LIB_SetFrameColor(const LIB_Color color) { glClearColor((float)color.r / 255, (float)color.g / 255, (float)color.b / 255, (float)color.a / 255); } LIB_Window* LIB_CreateWindow(const LIB_String title, int x, int y, const int width, const int height, const LIB_Bool resizable, const LIB_Bool fullscreen) { LIB_Window wind; wind.title = title; if (x == LIB_CENTER_POSITION) { const GLFWvidmode* mode = glfwGetVideoMode(glfwGetPrimaryMonitor()); x = (mode->width - width) / 2; } wind.x = x; if (y == LIB_CENTER_POSITION) { const GLFWvidmode* mode = glfwGetVideoMode(glfwGetPrimaryMonitor()); y = (mode->height - height) / 2; } wind.y = y; wind.width = width; wind.height = height; wind.fullscreen = fullscreen; glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE); glfwWindowHint(GLFW_RESIZABLE, resizable); wind.window = NULL; if (fullscreen == 1) { wind.window = (GLFWwindow**)glfwCreateWindow(width, height, title, glfwGetPrimaryMonitor(), NULL); } else if (fullscreen == 0) { wind.window = (GLFWwindow**)glfwCreateWindow(width, height, title, NULL, NULL); } glfwSetWindowPos((GLFWwindow*)wind.window, x, y); int screen_width, screen_height; glfwGetFramebufferSize((GLFWwindow*)wind.window, &screen_width, &screen_height); if (wind.window == NULL) { glfwTerminate(); return NULL; } glfwMakeContextCurrent((GLFWwindow*)wind.window); glewExperimental = GL_TRUE; if (glewInit() != GLEW_OK) { return NULL; } glViewport(0, 0, screen_width, screen_height); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glEnable(GL_BLEND); glEnable(GL_ALPHA_TEST); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); return &wind; } void LIB_GetWindowFrameSize(LIB_Window * window, int *width, int *height) { int screenwidth, screenheight; glfwGetFramebufferSize(((GLFWwindow*)window->window), &screenwidth, &screenheight); *width = screenwidth; *height = screenheight; } void LIB_GetWindowCursorPosition(LIB_Window * window, float *x, float *y) { double cx, cy; glfwGetCursorPos(((GLFWwindow*)window->window), &cx, &cy); *x = (float)cx; *y = (float)cy; } void LIB_GetDisplaySize(int *width, int *height) { const struct GLFWvidmode* mode = glfwGetVideoMode(glfwGetPrimaryMonitor()); *width = mode->width; *height = mode->height; } void LIB_GetWindowPosition(LIB_Window * window, int *x, int *y) { *x = (window)->x; *y = (window)->y; } void LIB_GetWindowSize(LIB_Window * window, int *width, int *height) { *width = (window)->width; *height = (window)->height; } LIB_String LIB_GetWindowTitle(LIB_Window * window) { return (window)->title; } LIB_Bool LIB_IsWindowFullScreen(LIB_Window * window) { return (window)->fullscreen; } LIB_Bool LIB_IsWindowOpened(LIB_Window * window) { return !glfwWindowShouldClose(((GLFWwindow*)window->window)); } void LIB_SwapWindowBuffers(LIB_Window * window) { glfwSwapBuffers(((GLFWwindow*)window->window)); } void LIB_SetWindowPosition(LIB_Window * window, const int x, const int y) { glfwSetWindowPos(((GLFWwindow*)window->window), x,y); (window)->x = x; (window)->y = y; } void LIB_SetWindowSize(LIB_Window * window, const int width, const int height) { glfwSetWindowSize(((GLFWwindow*)window->window), width, height); (window)->width = width; (window)->height = height; } void LIB_SetWindowTitle(LIB_Window * window, const LIB_String title) { glfwSetWindowTitle(((GLFWwindow*)window->window), title); (window)->title = title; } void LIB_SetFullScreenState(LIB_Window * window, const LIB_Bool fullscreen) { const GLFWvidmode* mode = glfwGetVideoMode(glfwGetPrimaryMonitor()); if (fullscreen == LIB_FALSE) { glfwSetWindowMonitor(((GLFWwindow*)window->window), NULL, (window)->x, (window)->y, (window)->width, (window)->height, 60); } else if (fullscreen == LIB_TRUE) { glfwSetWindowMonitor(((GLFWwindow*)window->window), glfwGetPrimaryMonitor(), 0, 0, mode->width, mode->height, 60); } (window)->fullscreen = fullscreen; } void LIB_DestroyWindow(LIB_Window * window) { (window)->window = NULL; (window)->title = NULL; (window)->x = 0; (window)->y = 0; (window)->width = 0; (window)->height = 0; free(window); } void LIB_Terminate() { printf("BLITZ terminated by the user!!\n"); glfwTerminate(); }
函数LIB_CreateWindow返回指向LIB_Window wind;变量LIB_Window wind;的指针LIB_Window wind; 。 函数终止后，变量超出范围，指针指向“无处”。 这是一种未定义的行为。 注意，函数中的局部变量在堆栈上分配，当函数终止时，它立即被释放。
您可以通过声明变量static快速解决此问题：
static LIB_Window wind;
但是，如果你这样做，那么当然库只能管理一个窗口。
要么创建动态分配的变量，
void LIB_CreateWindow( ..... ) { ..... LIB_Window *newWnd = malloc( sizeof(LIB_Window) ); *newWnd = wind; return newWnd; }
或者在函数外部声明类型为LIB_Window的变量，并通过指针将其提供给函数：
void LIB_CreateWindow( LIB_Window *ptr_wnd, ..... ); int main( void ) { ..... LIB_Window wind; LIB_CreateWindow( &wnd, ..... ); ..... }
当然， LIB_Window函数的内存释放在函数LIB_DestroyWindow ，只有在动态分配变量的内存时才有效：
LIB_DestroyWindow() { ..... free(window); // <--- this only works if window was allocated by malloc }