我目前正在将在MS VS2005中开发的c ++应用程序移植到linux，不幸的是这是我第一次这样做。我们使用的是Qt 4.6，Opencascade 6.5.1和Qwt 6.0.1。 大多数代码编译得很好，但有一次我们正在尝试使用X来确定客户端屏幕大小，一旦我尝试包含X库我就会遇到大量错误。类标题包含以下行：
#ifdef WNT
#include <windows.h>
#else
#include <X11/X.h>
#include <X11/Xlib.h>
#endif //WNT
当我只有#include <X11/X.h>行时，我收到以下错误：
In file included from v0000/plot_curve.h:7,
from v0000/utility.h:9,
from v0000/settings.h:16,
from v0000/dialog.cpp:10:
../../../qwt-6.0.1/include/qwt_symbol.h:35: error: expected identifier before numeric constant
../../../qwt-6.0.1/include/qwt_symbol.h:35: error: expected `}' before numeric constant
... <many more of these in this file>
In file included from v0000/plot_curve.h:7,
from v0000/utility.h:9,
from v0000/settings.h:16,
from v0000/dialog.cpp:10:
../../../qwt-6.0.1/include/qwt_symbol.h:10:1: unterminated #ifndef
In file included from v0000/utility.h:9,
from v0000/settings.h:16,
from v0000/dialog.cpp:10:
v0000/plot_curve.h:1:1: unterminated #ifndef
In file included from v0000/settings.h:16,
from v0000/dialog.cpp:10:
v0000/utility.h:1:1: unterminated #ifndef
In file included from v0000/dialog.cpp:10:
v0000/settings.h:1:1: unterminated #ifndef
仅限#include <X11/Xlib.h>行：
In file included from ../../../../lib/inc/gce_MakeDir.hxx:20,
from v0000/bounding_box.cpp:17:
../../../../lib/inc/gce_Root.hxx:49: error: expected unqualified-id before ')' token
In file included from ../../../../lib/inc/gce_Root.hxx:71,
from ../../../../lib/inc/gce_MakeDir.hxx:20,
from v0000/bounding_box.cpp:17:
../../../../lib/inc/gce_Root.lxx:11: error: expected unqualified-id before "int"
我们需要X for的代码目前已停用，所以没有这两个包含，所有内容都可以正常编译。
我似乎无法追查问题的根源。 X包含路径是正确的，qt和occ的示例应用程序工作（所以我猜他们正在使用X并且安装应该没问题）并且我找不到包含警卫的错误。
//修改 根据要求，以下是发生错误的文件的源代码：
qwt_symbol.h：（qwt）
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_SYMBOL_H
#define QWT_SYMBOL_H
#include "qwt_global.h"
#include <QPolygonF>
class QPainter;
class QRect;
class QSize;
class QBrush;
class QPen;
class QColor;
class QPointF;
//! A class for drawing symbols
class QWT_EXPORT QwtSymbol
{
public:
/*!
Symbol Style
\sa setStyle(), style()
*/
enum Style
{
//! No Style. The symbol cannot be drawn.
NoSymbol = -1,
//! Ellipse or circle
Ellipse,
//! Rectangle
Rect,
//! Diamond
Diamond,
//! Triangle pointing upwards
Triangle,
//! Triangle pointing downwards
DTriangle,
//! Triangle pointing upwards
UTriangle,
//! Triangle pointing left
LTriangle,
//! Triangle pointing right
RTriangle,
//! Cross (+)
Cross,
//! Diagonal cross (X)
XCross,
//! Horizontal line
HLine,
//! Vertical line
VLine,
//! X combined with +
Star1,
//! Six-pointed star
Star2,
//! Hexagon
Hexagon,
/*!
Styles >= QwtSymbol::UserSymbol are reserved for derived
classes of QwtSymbol that overload drawSymbols() with
additional application specific symbol types.
*/
UserStyle = 1000
};
public:
QwtSymbol( Style = NoSymbol );
QwtSymbol( Style, const QBrush &, const QPen &, const QSize & );
QwtSymbol( const QwtSymbol & );
virtual ~QwtSymbol();
QwtSymbol &operator=( const QwtSymbol & );
bool operator==( const QwtSymbol & ) const;
bool operator!=( const QwtSymbol & ) const;
void setSize( const QSize & );
void setSize( int width, int height = -1 );
const QSize& size() const;
virtual void setColor( const QColor & );
void setBrush( const QBrush& b );
const QBrush& brush() const;
void setPen( const QPen & );
const QPen& pen() const;
void setStyle( Style );
Style style() const;
void drawSymbol( QPainter *, const QPointF & ) const;
void drawSymbols( QPainter *, const QPolygonF & ) const;
virtual QSize boundingSize() const;
protected:
virtual void drawSymbols( QPainter *,
const QPointF *, int numPoints ) const;
private:
class PrivateData;
PrivateData *d_data;
};
/*!
\brief Draw the symbol at a specified position
\param painter Painter
\param pos Position of the symbol in screen coordinates
*/
inline void QwtSymbol::drawSymbol(
QPainter *painter, const QPointF &pos ) const
{
drawSymbols( painter, &pos, 1 );
}
/*!
\brief Draw symbols at the specified points
\param painter Painter
\param points Positions of the symbols in screen coordinates
*/
inline void QwtSymbol::drawSymbols(
QPainter *painter, const QPolygonF &points ) const
{
drawSymbols( painter, points.data(), points.size() );
}
#endif
gce_root.hxx :( opencascade）
// This file is generated by WOK (CPPExt).
// Please do not edit this file; modify original file instead.
// The copyright and license terms as defined for the original file apply to
// this header file considered to be the "object code" form of the original source.
#ifndef _gce_Root_HeaderFile
#define _gce_Root_HeaderFile
#ifndef _Standard_HeaderFile
#include <Standard.hxx>
#endif
#ifndef _Standard_Macro_HeaderFile
#include <Standard_Macro.hxx>
#endif
#ifndef _gce_ErrorType_HeaderFile
#include <gce_ErrorType.hxx>
#endif
#ifndef _Standard_Boolean_HeaderFile
#include <Standard_Boolean.hxx>
#endif
//! This class implements the common services for <br>
//! all classes of gce which report error. <br>
class gce_Root {
public:
void* operator new(size_t,void* anAddress)
{
return anAddress;
}
void* operator new(size_t size)
{
return Standard::Allocate(size);
}
void operator delete(void *anAddress)
{
if (anAddress) Standard::Free((Standard_Address&)anAddress);
}
//! Returns true if the construction is successful. <br>
Standard_Boolean IsDone() const;
//! Returns the status of the construction: <br>
//! - gce_Done, if the construction is successful, or <br>
//! - another value of the gce_ErrorType enumeration <br>
//! indicating why the construction failed. <br>
gce_ErrorType Status() const;
protected:
gce_ErrorType TheError;
private:
};
#include <gce_Root.lxx>
// other Inline functions and methods (like "C++: function call" methods)
#endif
gce_root.lxx :( opencascade）
// File: gce_Root.cxx
// Created: Tue Sep 29 12:34:39 1992
// Author: Remi GILET
// <reg@sdsun2>
inline Standard_Boolean gce_Root::IsDone () const
{
return TheError == gce_Done;
}
inline gce_ErrorType gce_Root::Status() const
{
return TheError;
}
答案 0 :(得分：4)
它无法直接帮助您解决问题，但QT有一个用于确定客户端屏幕大小的类，称为QDesktopWidget。所以你可以这样做：
QDesktopWidget *desktop = QApplication::desktop();
QRect geometry = desktop->availableGeometry();
或者该课程的其他功能之一。它允许您从多个屏幕中进行选择，并访问小部件所在的屏幕。
答案 1 :(得分：4)
以下内容包括：
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
我需要取消一些定义：
#undef Bool
#undef CursorShape
#undef Expose
#undef KeyPress
#undef KeyRelease
#undef FocusIn
#undef FocusOut
#undef FontChange
#undef None
#undef Status
#undef Unsorted
当然在.pro文件中添加LIBS += -lX11，你就可以了！
答案 2 :(得分：1)
您是否检查过以确保Qt未定义X11所需的类型，例如Bool？
看看Compiler does not see QX11Info，因为这包含了将X11与Qt包含在一起时的常见问题。
你可能需要的不仅仅是Bool。