ifstream无缘无故失败？
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我有一个3D球面的列表，当我保存列表时，我会遍历：
void Facade::Save(std::ostream& fs)
{
fs<<x<<\" \"<<y<<\" \"<<z<<\" \"<<r<<\" \"; //save fields
fs<<color[0]<<\" \"<<color[1]<<\" \"<<color[2]<<std::endl;
}
void Facade::Load(std::ifstream& fs, BallList* blist)
{
GLfloat c[3];
fs>>x>>y>>z>>r;
//fails there, why
fs>>c[0]>>c[1]>>c[2];
.....
}
7.05008 8.99167 -7.16849 2.31024 1 0 0
3.85784 -3.93902 -1.46886 0.640751 1 0 0
9.33226 3.66375 -6.93533 2.25451 1 0 0
6.43361 1.64098 -6.17298 0.855785 1 0 0
6.34388 -0.494705 -6.88894 1.50784 1 0 0
void BallList::Load(std::istream& fs)
{
Clear();
Facade ball1;
while(!fs.fail() && !fs.eof())
{
ball1.Load(fs, this);
Add(ball1);
}
/*
balls.pop_back(); //this is a work around, get rid of the last one
originalballs.pop_back();
*/
}
void BallList::Save(std::ostream& fs)
{
vector<Facade>::iterator itero = this->originalballs.begin();
while (itero != this->originalballs.end())
{
itero->Save(fs);
itero++;
}
/*
//work around the ifstream problem: the color of the last sphere cannot be read
//add a dummy item as the last
itero = this->originalballs.begin();
if(itero != this->originalballs.end())
{
itero->Save(fs);
}
*/
}
没有找到相关结果
已邀请:
1 个回复
呢率篓舍烫
std::ifstream& Facade::Load(std::ifstream& fs, BallList* blist) { GLfloat c[3]; fs>>x>>y>>z>>r; // This will fail if there is no input. // Once all 5 balls have been read // There is only a new line character on the stream. // Thus the above line will fail and the fail bit is now set. fs>>c[0]>>c[1]>>c[2]; return fs; // returned so it can be tested in loop. } void BallList::Load(std::istream& fs) { Clear(); Facade ball1; while(ball1.Load(fs, this)) // Only enter loop if the load worked { // Load worked if the stream is in a good state. // Only call Add() if Load() worked. Add(ball1); } }