QLibrary解决方案返回false [英] QLibrary resolve returns false
本文介绍了QLibrary解决方案返回false的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图动态地包含类文件,并通过加载.dll到QLibrary选择这样做。我现在的问题是,当我尝试调用resolve() - 方法,它返回0。
I´m trying to include classfiles dynamically right now and chose to do so by loading the .dll into a QLibrary. The problem I´m having now is, that when I try to call the resolve()-method it returns 0.
编辑:
在此期间问题已经解决,我决定编辑代码,所以其他人可以看到它的工作原理:
In the meantime the problem has been solved and I decided to edit the code, so others can see how it works:
这是.dll的头文件:
#ifndef DIVFIXTURE_H
#define DIVFIXTURE_H
#include<QObject>
#include<QVariant>
class __declspec(dllexport) DivFixture : public QObject
{
Q_OBJECT
public:
Q_INVOKABLE DivFixture();
Q_INVOKABLE void setNumerator(QVariant num);
Q_INVOKABLE void setDenominator(QVariant denom);
Q_INVOKABLE QVariant quotient();
private:
double numerator, denominator;
};
#endif
这是dll的.cpp -file:
#include "testfixture.h"
DivFixture::DivFixture(){}
void DivFixture::setNumerator(QVariant num)
{
numerator=num.toDouble();
}
void DivFixture::setDenominator(QVariant denom)
{
denominator=denom.toDouble();
}
QVariant DivFixture::quotient()
{
QVariant ret;
ret=numerator/denominator;
return ret;
}
//non-class function to return pointer to class
extern "C" __declspec(dllexport) DivFixture* create()
{
return new DivFixture();
}
这是我如何加载我的类:
currentFixture.setFileName("C:\\somepath\\testFixture.dll");
if(currentFixture.load());
{
typedef QObject* (*getCurrentFixture)();
getCurrentFixture fixture=(getCurrentFixture)currentFixture.resolve("create");
if (fixture)
{
Fixture=fixture();
}
}
推荐答案
class __declspec(dllexport) DivFixture : public QObject
{
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