Question

How to write and read Unicode to and from binary file with C Win32 API

Answer 1

#include <stdio.h>
#include <wchar.h>
#include <windows.h>

#define SIZE 32

int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    // Write unicode to binary file
    wchar_t unicode_buffer[SIZE] = L"ÖÉÁß";
    FILE* fp;
    
    if (fopen_s(&fp, "d:\\unicode_bin.dat", "wb") != 0) {
        wprintf(L"file write error\n");
        return 0;
    }
    fwrite(unicode_buffer, sizeof(wchar_t) * 4, 1, fp);
    fclose(fp);


    // Read unicode from binary file
    wchar_t read_unicode_buffer[SIZE] = L"";
    if (_wfopen_s(&fp, L"d:\\unicode_bin.dat", L"rb") != 0) {
        wprintf(L"file not found\n");
        return 0;
    }
    while (fread(read_unicode_buffer, sizeof(wchar_t) * 4, 1, fp)) {
        MessageBox(nullptr, read_unicode_buffer, TEXT(""), 0);
    }

    fclose(fp);

    return 0;
}



/*
run:

ÖÉÁß

*/

 

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