The below code works fine in Ubuntu. I am loading a texture for openGL using glad and glfw.

下面的代码在Ubuntu中运行良好。我正在使用GREAD和GLFW为OpenGL加载纹理。

#include <vector>
#include <iostream>
#include <fstream>
using namespace std;


#include <glad/glad.h>
#include <GLFW/glfw3.h>

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"


const bool loadResavedImages = true;
GLFWwindow* window;

void loadTexture( char const *filename, unsigned int &texture )
{
    
    cout << filename << endl;
    
    //static int texturesLoaded = 0;
    glGenTextures( 1, &texture );
    glBindTexture( GL_TEXTURE_2D, texture );
    
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
    
    int width, height, nrChannels;
    stbi_set_flip_vertically_on_load( true );
    
    unsigned char * data = NULL;
    
    char newFileName[ 50 ];
    snprintf( newFileName, sizeof(char) * ( strlen( filename ) - 3 ), "%s", filename );
    
    
    ifstream readFile( newFileName );
    
    if( loadResavedImages && readFile )
    {
        if( readFile.is_open() )
        {
            readFile >> width >> height;
            data = new unsigned char[ width * height * 4 ];
            readFile.read( (char *)data, width * height * 4 );
        }
        else
        {
            cout << "shouldnt happendfklgdskf" << endl;
        }
        
        readFile.close();
    }
    else
    {
        readFile.close();
        
        data = stbi_load( filename, &width, &height, &nrChannels, 0 );
        //saved images
        
        //save to a file
        
        ofstream saveFile( newFileName );
        
        if( saveFile.is_open() )
        {
            saveFile << width << " " << height;
            saveFile.write( (char *)&data[ 0 ], width * height * 4 );
        }
        else
            cout << "WHY!?!?!SDSGGFGAGSSG" << endl;
        
        
        saveFile.close();
    }   
    
    for( int i = 0; i < width * height * 4; i++ )
    {
        cout << int( data[ i ] ) << " ";
    }
    
    if ( data )
    {
        glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data );
            
        glGenerateMipmap( GL_TEXTURE_2D );
    }
    else
    {
        cout << "failed to load texture " << filename <<endl;
        exit( 0 );
    }
    
    if( loadResavedImages && readFile )
        delete [] data;
    else
    {
        stbi_image_free( data );
    }
    
}




// main
int main()
{
    glfwInit();
        
    window = glfwCreateWindow( 500, 500, "Window", NULL, NULL );
    
    glfwMakeContextCurrent( window );
    
    if ( !gladLoadGLLoader( (GLADloadproc)glfwGetProcAddress ) )
    {
        cout << "Failed to initialize GLAD" << endl;
        return 0;
    }
    
    //load texture
    unsigned int texture;
    loadTexture( "twirl.png", texture );
    
    return 0;
}

When loading this 400x400 texture "twirl.png" on Ubuntu, which is mostly empty transparent space we get expectedly a bunch of 0s at the end.

当在Ubuntu上加载这个400x400的纹理“twirl.png”时，我们意外地在最后得到了一堆0。

If you save and reload this texture from the data file "twirl" it expectedly outputs the same thing on Ubuntu.

如果你从数据文件“twirl”中保存并重新加载这个纹理，它会意外地在Ubuntu上输出相同的东西。

If this is run on windows the outputs at the end are different. We have an output of

如果这是在Windows上运行，则末尾的输出是不同的。我们的产量是

205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205 205

... etc
instead of the expected empty space

..。等，而不是预期的空白处

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

etc..

等等.。

Why does this occur on windows and how to get it to load and save correctly?

为什么在Windows上会发生这种情况，以及如何正确加载和保存？

Due to automatic character translation when the file is opened in the default text mode, changing the two lines of code

由于在默认文本模式下打开文件时会自动进行字符转换，因此更改了两行代码

ifstream readFile( newFileName );
//...
//...
ofstream saveFile( newFileName );
//...

to

至

ifstream readFile( newFileName, ios_base::binary );
//...
//...
ofstream saveFile( newFileName, ios_base::binary ); 
//...

fixes the issue in Windows.

修复了Windows中的问题。