我在使用Qt 4.8在发布模式下在Windows 7上编译我的项目时遇到了一些麻烦。 在Debug上一切正常，但在Release上我得到一个未处理的异常：0xC0000005：访问冲突。
我将它缩小到发生这种情况的行，这是我生成Pixel Buffers的时候。 我的第一个猜测是错误的DLL加载，但我检查了可执行文件与Dependency Walker，并且每个加载的DLL都是正确的。
这里有一些我的代码：
class CameraView : public QGLWidget, protected QGLFunctions; void CameraView::initializeGL() { initializeGLFunctions(this->context()); glGenBuffers(1, &pbo_); //<<<<< This is where I get the unhandled exception on Release mode glBindBuffer(QGLBuffer::PixelUnpackBuffer, pbo_); glBufferData(QGLBuffer::PixelUnpackBuffer, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); ... }同样，这在调试时非常有用。 为什么这只会发布在Release上？
I'm having some trouble while compiling my project on Windows 7 using Qt 4.8 on Release mode. Everything works fine on Debug, but on Release I get an Unhandled Exception: 0xC0000005: Access violation.
I narrowed it down to the line where this happens, which is when I generate my Pixel Buffers. My first guess would be wrong DLLs loading, but I checked the executable with Dependency Walker and every DLL loaded is correct.
Here goes some of my code:
class CameraView : public QGLWidget, protected QGLFunctions; void CameraView::initializeGL() { initializeGLFunctions(this->context()); glGenBuffers(1, &pbo_); //<<<<< This is where I get the unhandled exception on Release mode glBindBuffer(QGLBuffer::PixelUnpackBuffer, pbo_); glBufferData(QGLBuffer::PixelUnpackBuffer, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); ... }Again, this works great on debug. Why would this only happen on Release?
最满意答案
我知道了。 似乎这个问题与这个问题有关： https ： //forum.qt.io/topic/12492/qt-4-8-qglfunctions-functions-crash-in-release-build
并且还有一个可能与之相关的错误报告： https ： //bugreports.qt.io/browse/QTBUG-5729
也许initializeGLFunctions（）方法没有得到GL扩展函数的所有函数指针，我真的不知道为什么，但这似乎是它。
我的解决方案是停止使用Qt的GL扩展并开始使用glew。
那么，这对我有用：
#include <QtGui/QtGui> #include <gl/glew.h> #include <QtOpenGL/QGLWidget> class CameraView : public QGLWidget; void CameraView::initializeGL() { //initializeGLFunctions(this->context()); GLenum init = glewInit(); // Create buffers glGenBuffers(1, &pbo_); glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_); glBufferData(GL_PIXEL_UNPACK_BUFFER, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); // Set matrixes glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glOrtho(0, this->width(), 0, this->height(), 0, 1); glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); }确保在任何QTOpenGL标头之前包含glew.h，否则您将收到编译错误。
I got it. Seems like this issue is related to this one: https://forum.qt.io/topic/12492/qt-4-8-qglfunctions-functions-crash-in-release-build
and there's a bug report that may be related also: https://bugreports.qt.io/browse/QTBUG-5729
Perhaps the initializeGLFunctions() method is not getting all function pointers for the GL extension functions, I don't really know why but this seems to be it.
The solution for me was to stop using Qt's GL extensions and start using glew.
So, here's what worked for me:
#include <QtGui/QtGui> #include <gl/glew.h> #include <QtOpenGL/QGLWidget> class CameraView : public QGLWidget; void CameraView::initializeGL() { //initializeGLFunctions(this->context()); GLenum init = glewInit(); // Create buffers glGenBuffers(1, &pbo_); glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_); glBufferData(GL_PIXEL_UNPACK_BUFFER, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); // Set matrixes glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glOrtho(0, this->width(), 0, this->height(), 0, 1); glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); }Be sure that glew.h is included before any QTOpenGL headers or else you'll get a compilation error.
仅在发布模式下使用glGenBuffer的未处理异常 - QT(Unhandled Exception using glGenBuffer on Release mode only - QT)我在使用Qt 4.8在发布模式下在Windows 7上编译我的项目时遇到了一些麻烦。 在Debug上一切正常，但在Release上我得到一个未处理的异常：0xC0000005：访问冲突。
我将它缩小到发生这种情况的行，这是我生成Pixel Buffers的时候。 我的第一个猜测是错误的DLL加载，但我检查了可执行文件与Dependency Walker，并且每个加载的DLL都是正确的。
这里有一些我的代码：
class CameraView : public QGLWidget, protected QGLFunctions; void CameraView::initializeGL() { initializeGLFunctions(this->context()); glGenBuffers(1, &pbo_); //<<<<< This is where I get the unhandled exception on Release mode glBindBuffer(QGLBuffer::PixelUnpackBuffer, pbo_); glBufferData(QGLBuffer::PixelUnpackBuffer, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); ... }同样，这在调试时非常有用。 为什么这只会发布在Release上？
I'm having some trouble while compiling my project on Windows 7 using Qt 4.8 on Release mode. Everything works fine on Debug, but on Release I get an Unhandled Exception: 0xC0000005: Access violation.
I narrowed it down to the line where this happens, which is when I generate my Pixel Buffers. My first guess would be wrong DLLs loading, but I checked the executable with Dependency Walker and every DLL loaded is correct.
Here goes some of my code:
class CameraView : public QGLWidget, protected QGLFunctions; void CameraView::initializeGL() { initializeGLFunctions(this->context()); glGenBuffers(1, &pbo_); //<<<<< This is where I get the unhandled exception on Release mode glBindBuffer(QGLBuffer::PixelUnpackBuffer, pbo_); glBufferData(QGLBuffer::PixelUnpackBuffer, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); ... }Again, this works great on debug. Why would this only happen on Release?
最满意答案
我知道了。 似乎这个问题与这个问题有关： https ： //forum.qt.io/topic/12492/qt-4-8-qglfunctions-functions-crash-in-release-build
并且还有一个可能与之相关的错误报告： https ： //bugreports.qt.io/browse/QTBUG-5729
也许initializeGLFunctions（）方法没有得到GL扩展函数的所有函数指针，我真的不知道为什么，但这似乎是它。
我的解决方案是停止使用Qt的GL扩展并开始使用glew。
那么，这对我有用：
#include <QtGui/QtGui> #include <gl/glew.h> #include <QtOpenGL/QGLWidget> class CameraView : public QGLWidget; void CameraView::initializeGL() { //initializeGLFunctions(this->context()); GLenum init = glewInit(); // Create buffers glGenBuffers(1, &pbo_); glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_); glBufferData(GL_PIXEL_UNPACK_BUFFER, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); // Set matrixes glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glOrtho(0, this->width(), 0, this->height(), 0, 1); glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); }确保在任何QTOpenGL标头之前包含glew.h，否则您将收到编译错误。
I got it. Seems like this issue is related to this one: https://forum.qt.io/topic/12492/qt-4-8-qglfunctions-functions-crash-in-release-build
and there's a bug report that may be related also: https://bugreports.qt.io/browse/QTBUG-5729
Perhaps the initializeGLFunctions() method is not getting all function pointers for the GL extension functions, I don't really know why but this seems to be it.
The solution for me was to stop using Qt's GL extensions and start using glew.
So, here's what worked for me:
#include <QtGui/QtGui> #include <gl/glew.h> #include <QtOpenGL/QGLWidget> class CameraView : public QGLWidget; void CameraView::initializeGL() { //initializeGLFunctions(this->context()); GLenum init = glewInit(); // Create buffers glGenBuffers(1, &pbo_); glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_); glBufferData(GL_PIXEL_UNPACK_BUFFER, 3 * sizeof(BYTE) * image_width_ * image_height_, NULL, GL_STREAM_DRAW); // Set matrixes glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glOrtho(0, this->width(), 0, this->height(), 0, 1); glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); }Be sure that glew.h is included before any QTOpenGL headers or else you'll get a compilation error.
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