I'm creating a MenuBar in FLTK, and can't figure out how to remove the little underlines under each menu category. What setting controls this?
When you specify the labels of menu's entries, you have to remove &: see the examples below.
With &:
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <iostream>
#include <FL/Fl_Menu_Bar.H>
int main() {
Fl_Double_Window* G_win = new Fl_Double_Window(200,200);
Fl_Menu_Bar *menu = new Fl_Menu_Bar(0,0,400,25);
menu->add("&File"); // F is underlined
menu->add("Edi&t"); // t is underlined
G_win->show();
return(Fl::run());
}
Without &:
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <iostream>
#include <FL/Fl_Menu_Bar.H>
int main() {
Fl_Double_Window* G_win = new Fl_Double_Window(200,200);
Fl_Menu_Bar *menu = new Fl_Menu_Bar(0,0,400,25);
menu->add("File"); // No letter is underlined
menu->add("Edit"); // No letter is underlined
G_win->show();
return(Fl::run());
}
In the last case, the label of each menu does not have any underlined letter. See here for a more detailed explanation.
Related
After filling QTextDocument with two paragraphs separated with empty line, to insert a new paragraph with empty line between them I need to press Enter button 3 times, instead of two expected. This happens with Qt 6.3.1. Do I do something wrong, or this is an issue of Qt?
#include <QTextEdit>
#include <QApplication>
#include <QTextDocument>
void fillTextDocument(QTextDocument *doc, const QString &text)
{
QTextCursor c(doc);
c.movePosition(QTextCursor::End);
QTextCharFormat fmt = c.charFormat();
QTextBlockFormat b = c.blockFormat();
fmt.setFontWeight(QFont::Normal);
fmt.setFontItalic(false);
fmt.setFontUnderline(false);
fmt.setAnchor(false);
fmt.setAnchorHref(QString());
fmt.setForeground(QBrush(Qt::black));
b.setAlignment(Qt::AlignLeft);
QFont f = fmt.font();
f.setPixelSize(15);
fmt.setFont(f);
c.setCharFormat(fmt);
c.setBlockFormat(b);
c.insertText(text);
c.movePosition(QTextCursor::End);
doc->clearUndoRedoStacks();
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QTextEdit e;
fillTextDocument(e.document(), QStringLiteral("Hello\n\nHello"));
e.resize(600, 400);
e.show();
return QApplication::exec();
}
Guys, I consider this as a bug of Qt 6.3.1, regression in comparison with Qt 5.15. With Qt 5.15 the problem is not reproducible.
I have tried to "simplify" a nice piece of example code, the hyperlink to the code is at the end of this message, to specify the directory string instead of passing it as a command line argument. The simplified code compiles and executes, but the filename and size are not what I expect: the file name appears to be a hex number, and the nFileSize.High is larger than the nFileSize.Low (the actual file sizes range from 0 to 100Mb). I think my type casting may have introduced errors. Any suggestions?
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <cctype>
#include <bitset>
#include <sstream>
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>
#pragma comment(lib, "User32.lib")
using namespace std;
using namespace System; //set common language runtime support to /clr
int main()
{
WIN32_FIND_DATA ffd;
LARGE_INTEGER filesize;
//TCHAR szDir[MAX_PATH];
//size_t length_of_arg;
HANDLE hFind = INVALID_HANDLE_VALUE;
//DWORD dwError=0;
finstr = "C:\\Users\\MyName\\Documents\\Visual Studio 2010\\Projects\\Data Analysis\\Data Folder\\*";
//Just evaluate the first file before looping over all files
hFind = FindFirstFile((wchar_t*)(finstr.c_str()), &ffd);
wstring wsfname(ffd.cFileName);
string newtemp(wsfname.begin(), wsfname.end());
cout << "1st fname = " << ffd.cFileName << " newtemp = "<< newtemp << " nFSizeLo = "<< ffd.nFileSizeLow << " nFSizeHi = "<< ffd.nFileSizeHigh << "\n";
FindClose(hFind);
return 0;
}
Link to original example from Microsoft
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365200(d=printer,v=vs.85).aspx
I am new to coding and I keep getting stuck in the first few lines of code and I cannot figure out why. This is what I have so far:
#include <stdio.h>
#include <cs50.h>
int main(void);
int n;
{
printf("Minute: ");
int n = get_int();
}
I am getting this message when I try to compile the code:
What did I do wrong?
You're trying to call the main function. You should only define it. It will be called when the program is executed (it is the "entry point").
To define it, remove the semicolon after
int main(void)
You can also remove that void keyword
Then move that line down, between
int n; and the { that comes after it
Additionally, you're declaring the n variable twice. After you fix the first error, the compiler will complain about this one. Remove one of the declarations then.
You should remove the semicolon after int main(void) and move the variable declaration for n within the braces. Here is the correct code below.
#include <stdio.h>
#include <cs50.h>
int main(void)
{
int n;
printf("Minute: ");
int n = get_int();
}
I have imported object (Cube) from 3dsMax in my OSG project in VisualStudio. But I can't find out how to make transparent only one face of this imported cube. this is my code:
#include <osgViewer/Viewer>
#include <iostream>
#include <osg/Group>
#include <osg/Node>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/StateSet>
#include <osg/StateAttribute>
#include <osg/CullFace>
#include <osg/Point>
#include <osg/Light>
#include <osg/LightSource>
#include <osg/BlendFunc>
#include <osg/Material>
#include <osg/PolygonMode>
int main(int argc, char** argv)
{
osg::ref_ptr<osg::Group> root = new osg::Group;
osg::ref_ptr<osg::Node> model = osgDB::readNodeFile("cube.3ds"); //Importing model
osg::StateSet* state2 = model->getOrCreateStateSet(); //Creating material
osg::ref_ptr<osg::Material> mat2 = new osg::Material;
mat2->setAlpha(osg::Material::FRONT_AND_BACK, 0.1); //Making alpha channel
state2->setAttributeAndModes( mat2.get() ,
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
osg::BlendFunc* bf = new //Blending
osg::BlendFunc(osg::BlendFunc::SRC_ALPHA,
osg::BlendFunc::ONE_MINUS_DST_COLOR );
state2->setAttributeAndModes(bf);
root->addChild(model.get());
osgViewer::Viewer viewer;
viewer.setSceneData(root.get());
viewer.setUpViewOnSingleScreen(0);
return viewer.run();
}
This is my source with just imported file. I've tried implement transparency with multiple passes but have no success.
Is there any method how could i make it ?
The code in the question does make the model transparent. For example, with the cessna model from the OSG data package:
Adding two more models, a box and a sphere, where the box also has blending:
We see that blending is working. If you add another model but it isn't displayed, then probably the plane is being rendered before the other models. If the plane happens to be in front of the other models, even if the plane is transparent, you won't see them; as they don't pass the depth test.
Adding
cessna->getStateSet()->setMode( GL_BLEND, osg::StateAttribute::ON );
cessna->getStateSet()->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
forces the cessna to be rendered after the opaque models.
Also, note that if you provide a blending function, then you don't need to call
cessna->getStateSet()->setMode( GL_BLEND, osg::StateAttribute::ON );
Let's see another scene, where the box is behind the plane and we haven't set the rendering hint:
And now with the rendering hint active:
I want to create a file and map it into memory. I think that my code will work but when I run it I'm getting a "bus error". I searched google but I'm not sure how to fix the problem. Here is my code:
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/mman.h>
#include <string.h>
int main(void)
{
int file_fd,page_size;
char buffer[10]="perfect";
char *map;
file_fd=open("/tmp/test.txt",O_RDWR | O_CREAT | O_TRUNC ,(mode_t)0600);
if(file_fd == -1)
{
perror("open");
return 2;
}
page_size = getpagesize();
map = mmap(0,page_size,PROT_READ | PROT_WRITE,MAP_SHARED,file_fd,page_size);
if(map == MAP_FAILED)
{
perror("mmap");
return 3;
}
strcpy(map, buffer);
munmap(map, page_size);
close(file_fd);
return 0;
}
You are creating a new zero sized file, you can't extend the file size with mmap. You'll get a bus error when you try to write outside the content of the file.
Use e.g. fallocate() on the file descriptor to allocate room in the file.
Note that you're also passing the page_size as the offset to mmap, which doesn't seem to make much sense in your example, you'll have to first extend the file to pagesize + strlen(buffer) + 1 if you want to write buf at that location. More likely you want to start at the beginning of the file, so pass 0 as the last argument to mmap.