[英]Read text file into char Array. C++ ifstream
Im trying to read the whole file.txt into a char array. 我试图将整个file.txt读入一个char数组。 But having some issues, suggestions please =]
但有一些问题,建议请=]
ifstream infile;
infile.open("file.txt");
char getdata[10000]
while (!infile.eof()){
infile.getline(getdata,sizeof(infile));
// if i cout here it looks fine
//cout << getdata << endl;
}
//but this outputs the last half of the file + trash
for (int i=0; i<10000; i++){
cout << getdata[i]
}
std::ifstream infile;
infile.open("Textfile.txt", std::ios::binary);
infile.seekg(0, std::ios::end);
size_t file_size_in_byte = infile.tellg();
std::vector<char> data; // used to store text data
data.resize(file_size_in_byte);
infile.seekg(0, std::ios::beg);
infile.read(&data[0], file_size_in_byte);
Use std::string
: 使用
std::string
:
std::string contents;
contents.assign(std::istreambuf_iterator<char>(infile),
std::istreambuf_iterator<char>());
You don't need to read line by line if you're planning to suck the entire file into a buffer. 如果您计划将整个文件吸入缓冲区,则无需逐行读取。
char getdata[10000];
infile.read(getdata, sizeof getdata);
if (infile.eof())
{
// got the whole file...
size_t bytes_really_read = infile.gcount();
}
else if (infile.fail())
{
// some other error...
}
else
{
// getdata must be full, but the file is larger...
}
Every time you read a new line you overwrite the old one. 每次读取新行时都会覆盖旧行。 Keep an index variable i and use
infile.read(getdata+i,1)
then increment i. 保留索引变量i并使用
infile.read(getdata+i,1)
然后递增i。
You could use Tony Delroy's answer and incorporate a little function to determine the size of the file, and then create the char
array of that size, like this: 您可以使用Tony Delroy的答案并合并一个小函数来确定文件的大小,然后创建该大小的
char
数组,如下所示:
//Code from Andro in the following question: https://stackoverflow.com/questions/5840148/how-can-i-get-a-files-size-in-c
int getFileSize(std::string filename) { // path to file
FILE *p_file = NULL;
p_file = fopen(filename.c_str(),"rb");
fseek(p_file,0,SEEK_END);
int size = ftell(p_file);
fclose(p_file);
return size;
}
Then you can do this: 然后你可以这样做:
//Edited Code From Tony Delroy's Answer
char getdata[getFileSize("file.txt")];
infile.read(getdata, sizeof getdata);
if (infile.eof()) {
// got the whole file...
size_t bytes_really_read = infile.gcount();
}
else if (infile.fail()) {
// some other error...
}
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