C++文件输入输出

最新推荐文章于 2025-03-29 09:29:16 发布

ylh1234

最新推荐文章于 2025-03-29 09:29:16 发布

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分类专栏： C++

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这篇博客介绍了如何在C++中进行文件输入输出操作，包括文本文件的读取和写入。示例代码展示了如何使用ofstream进行文件写入，如向'norms.txt'文件中插入内容，并使用ifstream读取文件内容，如从'original.txt'中提取并处理三维点的数据。

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常见的文本文件格式输出方法如下

char * File2 = "norms.txt";
ofstream outfile2(File2);

outfile2 << endl;

vector<int>PointNormals;

int jj = 0;

while (jj < PointNormals.size())
{
outfile2 << setiosflags(ios::fixed)<<setw(20)<<PointNormals[jj]<< " ";
if (!((jj + 1) % 3))
{
outfile2 << endl;
}

jj++;

}

PointNormals.resize(0);

outfile2.close();

输入例子如下

ReadPoints_Resample(readMode _rm){

m_NumOfPoint = 0;
ifstream infile(filename,ios_base::in);
if (!infile)
{
return ;
}
m_Points.resize(WNUM);
for (int i = 0; i < WNUM; i++)
{
m_Points[i].resize(HNUM);
}
for (int i = 0; i < WNUM; i++)
{
for (int j = 0; j < HNUM; j++)
{
m_Points[i][j].resize(DNUM);
}
}
ofstream outfile("original.txt");
if (_rm == WITH_VOL_COORD)
{
for (int i = 0; i < WNUM; i++)
{
for (int j = 0; j < HNUM; j++)
{
for (int k = 0; k < DNUM; k++)
{
double t_x, t_y, t_z, t_vol;
infile >> t_vol;
infile >> t_x >> t_y >> t_z;
t_point.x = AIR_AFFINE(0, i, WNUM - 1, minX, maxX);
t_point.y = AIR_AFFINE(0, j, HNUM - 1, minY, maxY);
t_point.z = AIR_AFFINE(0, k, DNUM - 1, minZ, maxZ);
//outfile << t_point.vol << " " << t_point.x << " " << t_point.y << " " << t_point.z << endl;
m_Points[i][j][k] = t_point;
}
}
}
}else if(_rm == WITH_ONLY_VOL){

double max_vol = -1;
for (int i = 0; i < WNUM; i++)
{
for (int j = 0; j < HNUM; j++)
{
for (int k = 0; k < DNUM; k++)
{

NorPoint t_point;
double t_vol;
infile >> t_vol;

t_point.vol = t_vol;
t_point.x = AIR_AFFINE(0, i, WNUM - 1, minX, maxX);
t_point.y = AIR_AFFINE(0, j, HNUM - 1, minY, maxY);
t_point.z = AIR_AFFINE(0, k, DNUM - 1, minZ, maxZ);

//蚂蚁体数据阈值选为-0.2

if (t_vol > 0.3)
{
t_point.vol = 1;
m_NumOfPoint += 1;
outfile << t_point.vol << " " << t_point.x << " " << t_point.y << " " << t_point.z << endl;

}else{
t_point.vol = 0;
}

m_Points[i][j][k] = t_point;

}
}
}

}else{

for (int i = 0; i < WNUM; i++)
{
for (int j = 0; j < HNUM; j++)
{
for (int k = 0; k < DNUM; k++)
{
NorPoint t_point;

t_point.x = AIR_AFFINE(0, i, WNUM - 1, minX, maxX);
t_point.y = AIR_AFFINE(0, j, HNUM - 1, minY, maxY);
t_point.z = AIR_AFFINE(0, k, DNUM - 1, minZ, maxZ);

if (k == -j + DNUM)
{
t_point.vol = 1.0;
m_NumOfPoint += 1;
outfile << t_point.vol << " " << t_point.x << " " << t_point.y << " " << t_point.z << endl;
}else{

t_point.vol = 0.0;
}

m_Points[i][j][k] = t_point;

}
}
}

}

outfile.close();