我有一个包含一组char *属性的结构。清空包含char的结构数组*
struct gcp_values {
char* srcX;
char* srcY;
char* dstX;
char* dstY;
};
好,我填补它在一个循环从集合Q对象
std::vector<GeoRefLibrary::gcp_values> gcpvalues(vl.size());
for(int i=0;i<vl.size();i++) {
gcppoint_ *a = qobject_cast<gcppoint_ *>(vl.at(i).value<QObject *>());
gcpvalues[i].srcX= strdup(QString::number(a->row()).toStdString().c_str());
gcpvalues[i].srcY= strdup(QString::number(a->column()).toStdString().c_str());
gcpvalues[i].dstX= strdup(QString::number(a->lon()).toStdString().c_str());
gcpvalues[i].dstY= strdup(QString::number(a->lat()).toStdString().c_str());
}
当我运行Valgrind的测试结果,这些OUTPT
12 bytes in 4 blocks are definitely lost in loss record 813 of 19,623
14 bytes in 4 blocks are definitely lost in loss record 889 of 19,623
16 bytes in 1 blocks are definitely lost in loss record 3,621 of 19,623
32 bytes in 4 blocks are definitely lost in loss record 8,851 of 19,623
36 bytes in 4 blocks are definitely lost in loss record 9,134 of 19,623
这些错误是在这些线路
的循环。我试图delete [] gcpvalues
,但它返回错误的删除/免费错误。我搜索,发现这个职位太
,但不能找到解决方案,可有一个人请帮我解决这个问题?
我也试过
struct gcp_values {
QString srcX;
QString srcY;
QString dstX;
QString dstY;
};
和返回同样的错误
我改变了循环到这一点,似乎错误都没有了
for(int i=0;i<vl.size();i++) {
gcppoint_ *a = qobject_cast<gcppoint_ *>(vl.at(i).value<QObject *>());
char* srcX = strdup(QString::number(a->row()).toStdString().c_str());
char* srcY = strdup(QString::number(a->column()).toStdString().c_str());
char* dstX = strdup(QString::number(a->lon()).toStdString().c_str());
char* dstY = strdup(QString::number(a->lat()).toStdString().c_str());
gcpvalues[i].srcX=srcX;
gcpvalues[i].srcY= srcY;
gcpvalues[i].dstX= dstX;
gcpvalues[i].dstY= dstY;
if(srcX) { free(srcX);}
if(srcY) { free(srcY);}
if(dstX) { free(dstX);}
if(dstY) { free(dstY);}
}
'strdup'文件特别指出:*必须将返回的指针传递给空闲以避免内存泄漏。* –
只需将'QString's放入'struct'中即可避免此问题。手动内存管理是困难和不必要的。不要这样做。 – nwp
@nwp然后以后如何将Qstring转换为char *,因为我在后面的函数中需要char *。 –