winapi - Win32では、テキストファイルをメモリに正常に読み込むにはどうすればよいですか。

Answer 1

Ok I started this with a comment, but its getting out of control.

For Writing

This:

WCHAR *lpszText = new WCHAR[dwTextSize];

should be:

WCHAR *lpszText = new WCHAR[dwTextSize+1];

This:

DeleteObject(hTextFile);

should not be there at all.. Get rid of it.

I'm assuming you delete [] lpszText; somewhere when you're done with it. if not, do so.

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For Reading

The second parameter to GetFileSize() should not be the same variable as your return value. It is the HIGH 32bit of a 64-bit value for large file sizes. If you know you're file size is smaller than 4gB, you can leave it NULL, so change this:

DWORD dwFileSize = GetFileSize(hTextFile, &dwFileSize);

to this:

DWORD dwFileSize = GetFileSize(hTextFile, NULL);

You must account for the null terminator of your file buffer, so this:

WCHAR *lpszText = new WCHAR[dwFileSize / 2];

should be changed to this:

WCHAR *lpszText = new WCHAR[dwFileSize / 2 + 1];
lpszText[dwFileSize / 2] = 0;

and the rest should work as you're hoping it would. No error checking, which is not good, but I've seen worse. And as before, I'm assuming you delete [] lpszText; somewhere when you're done with it. if not, do so.