WinAPI编辑控件不显示换行符

Question

Well, that's only half true. Newlines work fine for the most part, but when I load a file into it, none of the newlines are shown. Copying the text and pasting it into Notepad++ with view all characters turned on shows that the carriage return and line feed are there.

My loading code:

void open_file(HWND hwnd,const char* fname){
    SendMessage(textbox,WM_SETTEXT,(WPARAM)0,(LPARAM)"");
    FILE* file=fopen(fname,"r");
    fullpath=fname;
    filename=fullpath.substr(fullpath.rfind('\\')+1,fullpath.length());
    int pos;
    while(!feof(file)){
        pos=GetWindowTextLength(textbox);
        SendMessage(textbox,EM_SETSEL,pos,pos);
        fread(buffer,2048,sizeof(char),file);
        SendMessage(textbox,EM_REPLACESEL,false,(LPARAM)buffer);}
    fclose(file);
    SendMessage(hwnd,WM_SETTEXT,0,(LPARAM)filename.c_str());}

Answer 1

Since you're opening the file in text mode your text represents newline by \\n . Possibly the text edit control requires \\r\\n .

One possibility is to do like this (off the cuff)

std::string line;
std::ifstream file( fname );
while( std::getline( file, line ) )
{
    line += "\r\n";
    // Append  the line to the edit control here (use c_str() ).
}

But better, set the text all at once, like:

std::string line;
std::string text;
std::ifstream file( fname );
while( std::getline( file, line ) )
{
    line += "\r\n";
    text += line;
}
SetWindowText( textbox, text.c_str() ... whatever );  // Not sure of args, check docs.

Cheers & hth.,