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[英]How to write data into a buffer and write the buffer into a binary file with a second thread?
[英]write a float buffer to a binary file
我尝试这样做,getHeight()返回数据的Height和getWidth()的宽度。
ofstream output(filename, ios::out | ios::binary);
output.write((char *)buffer, img.getHeight() * img.getWidth() * 3);
我也尝试这个,因为i = 0到i = 3 * height * width
fp = fopen(filename, "wb");
fwrite(reinterpret_cast<char*>(&buffer[i][0]), 1, 3*height*width, fp);
浮点数每个为4个字节。 fwrite()不知道您要编写的类型,因此对于大小,还需要乘以每个元素的大小。
fwrite(reinterpret_cast<char*>(&buffer[i][0]), 1, 3*height*width * sizeof(float), fp);
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
int main() {
ofstream out("blah.txt");
float val = 10.0f;
out << fixed << setprecision(5) << val << endl;
out.close();
return 0;
}
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