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我是 Qt 和 ROS 的新手。我正在开发 Qt Creator 4.8.0。我在 Qt 中创建了一个 catkin 工作区并创建了一个mainwindow。我正在尝试添加QVTKWidgetmainwindow. 它已成功构建,但在运行时会显示错误消息。

代码:mainwindow.cpp

vtkWidget = new QVTKWidget;
ui.verticalLayout->addWidget(vtkWidget);
ui.verticalLayout->update();
ren = vtkRenderer::New();
vtkWidget->GetRenderWindow()->AddRenderer(ren);
ren->SetBackground(1.0,0,0);
ren->Render();
Error:realloc(): invalid pointer: 0x00007facb5723820 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7facb37d77e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x85d80)[0x7facb37e5d80]
/lib/x86_64-linux-gnu/libc.so.6(realloc+0x22f)[0x7facb37e48ef]
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN9QListData7reallocEi+0x1f)[0x7facada009cf]
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN9QListData6appendEi+0x81)[0x7facada00aa1]
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5(+0x1d6d78)[0x7facadaccd78]
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_Z21qRegisterResourceDataiPKhS0_S0_+0x2e6)[0x7facadac8b16]
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5(+0x7bcc3)[0x7facad971cc3]
/lib64/ld-linux-x86-64.so.2(+0x106ba)[0x7facb6c5a6ba]
/lib64/ld-linux-x86-64.so.2(+0x107cb)[0x7facb6c5a7cb]
/lib64/ld-linux-x86-64.so.2(+0xc6a)[0x7facb6c4ac6a]
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1 回答 1

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您应该vtkWidget->GetRenderWindow()在调用它之前检查是否返回一个有效的指针,AddRenderer而不是

vtkWidget->GetRenderWindow()->AddRenderer(ren);

尝试

vtkRenderWindow * window = vtkWidget->GetRenderWindow();
if(window != nullptr)
{
     window->AddRenderer(ren);
     //etc.

同样的检查也应该适用于vtkRenderer

ren = vtkRenderer::New();
if(ren != nullptr)
{
    //etc.

如果你碰巧发现了一些空指针,看看这篇文章是否有帮助。

于 2019-04-09T07:54:48.283 回答