Converting cstring to byte and store it in a local file.

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I want to convert the cstring to bytes and store it in a local file with size.
The following code does not help. Just open the file and the string text is saved.

What I have tried:

CString str = "I am not sure that this method is right or not. Anyone can tell me how to convert a CString to BYTE* ?";

BYTE *pByte;

int length = str.GetLength();
pByte = new BYTE[length + 1];
memcpy(pByte, (VOID*)LPCTSTR(str), length);
str.ReleaseBuffer();

FILE *fp;

if (fp = fopen("C:\\Users\\user\\mui0n.txt", "wb")) {		
        fwrite(&length, sizeof(int), 1, fp);
	fwrite(pByte, length, 1, fp);
}		
fclose(fp);
delete[] pByte;

Posted 22-Nov-17 21:35pm

Chopin2001

Updated 22-Nov-17 21:56pm

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CPallini · Accepted Answer · 2017-11-22T21:56:00

If you need to store the CString object for later retrieval I sugggest you using Serialization in MFC | Microsoft Docs[^].
That said, in your code you are calling str.ReleaseBuffer() despite you didn't call str.GetBuffer() and, in any case you could have written instead

CString str = "I am not sure that this method is right or not. Anyone can tell me how to convert a CString to BYTE* ?";
FILE *fp;
if (fp = fopen("C:\\Users\\user\\mui0n.txt", "wb")) {		
        fwrite(&length, sizeof(int), 1, fp);
	fwrite((PCTSTR)str, length, sizeof(TCHAR), fp);
}		
fclose(fp);