I am trying to make an ASCII converter in C that outputs an image using ▀ ▄ ░ █ Unicode characters.

It works, except for the output part. Instead of the actual characters, it just displays ?.

When I add system("chcp 65001"); or system("chcp 65001"); (to use UTF-8/UTF-16) at the beginning of the file, it doesn't do anything, and still displays ?

When I try add /source-charset:utf-8 /execution-charset:utf-8 to the debug properties, it writes some weird LoLs:

Here is the whole code:

#include <iostream>
#define STBI_ONLY_BMP
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

int main(int argc, char* argv[]) {
    system("chcp 65001");
    int width, height, channels;
    unsigned char* img = stbi_load("C:/Users/user/source/repos/OCBitmapConvert/grayscale.bmp", &width, &height, &channels, 1);
    if (img == NULL) {
        printf("Error in loading the image\n");
        exit(1);
    }
    char imgarray[80][50];
    printf("Loaded image with a width of %dpx, a height of %dpx and %d channels\n", width, height, channels);
    //Convert the image from 1 dimensional array to 2 dimensional array
    for(int y = 0; y < 50; y  ){
        for (int x = 0; x < 79; x  ){
            int pixell = (y*80) x;
            if(img[pixell] == 0){
                imgarray[x][y] = 0;
            }
            else imgarray[x][y] = 1;
        };
    };
    //Print the 2dim array (just for debugging that the 2d array conversion works correctly)
    for(int y = 0; y < 50; y  ){
        for(int x = 0; x < 79; x  ){
            printf("%d",imgarray[x][y]);
        }
        printf("\n");
    }
    //Convert the image to ascii characters (using ▀ ▄ ░ █). 2 pixels above each other is 1 unicode character
    printf("\n\n\n");
    for(int y = 0; y < 48; y= y 2){
        for(int x = 0; x < 79; x  ){
            if(imgarray[x][y] == 0){
                if(imgarray[x][y   1] == 0){
                    printf("░");
                }
                else printf("▄");
            }
            else{
                if(imgarray[x][y   1] == 0){
                    printf("▀");
                }
                else printf("█");
            }
        }
        printf("\n");
    }
}

CodePudding user response：

After testing, the following code can output ▀ ▄ ░ █ , you could refer to my code to modify your code.

#include <stdio.h>
#include <io.h>
#include <fcntl.h>

int main()
{
    _setmode(_fileno(stdout), _O_U16TEXT);
    wprintf(L"░▒▓▄▀█▀ ▄ ░ █\n");
    return 0; // CYRILLIC CAPITAL LETTER YAE U 0518
}

Result:

Update:

I modified the code with reference to your sample, the code can still run, I suggest you refer to this code and modify it.

#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <iostream>
#define STBI_ONLY_BMP
#define STB_IMAGE_IMPLEMENTATION
int main()
{
    _setmode(_fileno(stdout), _O_U16TEXT);
    char imgarray[80][50];
    for (int y = 0; y < 50; y  ) {
        for (int x = 0; x < 79; x  ) {
            
            
             imgarray[x][y] = 1;
        }
    }
    for (int y = 0; y < 48; y = y   2) {
        for (int x = 0; x < 79; x  ) {
            if (imgarray[x][y] == 1)
                wprintf(L"░▒▓▄▀█▀ ▄ ░ █\n");
        }
    }
    return 0; 
}

Result:

In this case you need to find the place that caused the exception. The debugger cannot predict the future, but you can tell it to break on all exceptions, (ctrl atl e and tick all the boxes under "Thrown"). When the assert happens walk down the call stack to your code it will tell you which line is causing the problem.