Question

我试图在Qt应用程序中使用C ++库进行机械模拟。（Project Chrono ，Git Hub source）一切都很好，直到我尝试使用库的某些部分并得到一些错误。问题代码的一部分是：

ChGlobal.h

//
// PROJECT CHRONO - http://projectchrono.org
//
// Copyright (c) 2010-2011 Alessandro Tasora
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file at the top level of the distribution
// and at http://projectchrono.org/license-chrono.txt.
//

#ifndef CHGLOBAL_H
#define CHGLOBAL_H

#include <string>
#include "core/ChApiCE.h"

namespace chrono {

/// Set the path to the Chrono data directory (ATTENTION: not thread safe)
ChApi void SetChronoDataPath(const std::string& path);

/// Obtain the current path to the Chrono data directory (thread safe)
ChApi const std::string& GetChronoDataPath();

/// Obtain the complete path to the specified filename, given relative to the
/// Chrono data directory (thread safe)
ChApi std::string GetChronoDataFile(const std::string& filename);

}  // END_OF_NAMESPACE____

#endif

ChGlobal.cpp

//
// PROJECT CHRONO - http://projectchrono.org
//
// Copyright (c) 2010 Alessandro Tasora
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file at the top level of the distribution
// and at http://projectchrono.org/license-chrono.txt.
//

#include <string.h>

#include "physics/ChGlobal.h"

#if defined(_WIN32) || defined(_WIN64)
#include "Windows.h"
#endif

#if defined(__APPLE__)
#include <libkern/OSAtomic.h>
#endif

namespace chrono {

// -----------------------------------------------------------------------------
// Functions for manipulating the Chrono data directory
// -----------------------------------------------------------------------------

static std::string chrono_data_path("../data/");

// Set the path to the Chrono data directory (ATTENTION: not thread safe)
void SetChronoDataPath(const std::string& path) {
    chrono_data_path = path;
}

// Obtain the current path to the Chrono data directory (thread safe)
const std::string& GetChronoDataPath() {
    return chrono_data_path;
}

// Obtain the complete path to the specified filename, given relative to the
// Chrono data directory (thread safe)
std::string GetChronoDataFile(const std::string& filename) {
    return chrono_data_path + filename;
}

}  // END_OF_NAMESPACE____

我在qt中的代码是：

const std::string& teste= chrono::GetChronoDataPath();
qDebug()<<"DataPath:"<<teste.c_str();

我得到一个奇怪的结果：

_________
Debugging starts
DataPath: ata/
Debugging has finished
__________

我只收到字符串的一部分。

然后如果尝试使用代码设置新路径：

 const std::string& newpath("c:/");
 chrono::SetChronoDataPath(newpath);

我得到了以下错误：

Exception at 0x74dfc42d, code: 0xe06d7363: C++ exception, flags=0x1 (execution cannot be continued) (first chance) at f:\dd\vctools\crt\crtw32\heap\new.cpp:62

是因为chrono_data_path是静态变量吗？我尝试了另一种方法，但没有任何效果。我不是C ++专家，也许我错过了什么，

由于

Answer 1

最简单的解决方案是转换库并将其与应用程序静态链接。

如果您坚持动态链接库，则可以使用线程安全的Q_GLOBAL_STATIC机制：

// implementation (.cpp)

class chrono_data_path_t : public std::string {
public:
  chrono_data_path_t() : std::string("../data/") {}
};

Q_GLOBAL_STATIC(chrono_data_path_t, chrono_data_path)

namespace chrono {

void SetChronoDataPath(const std::string& path) {
    *chrono_data_path = path;
}

const std::string& GetChronoDataPath() {
    return *chrono_data_path;
}

std::string GetChronoDataFile(const std::string& filename) {
    return *chrono_data_path + filename;
}

} // namespace chrono

Answer 2

我想出了问题，我正在将我的程序的调试版本与该库的发行版混合。库的Cmake配置为两个构建版本生成相同的名称。

在共享库中使用静态std :: string的问题

2 个答案: