изменить цвет текста в win32 richedit

Я хочу показать разные цвета текста в элементе управления win32 rich edit, вот мой тест

#include <windows.h>
#include <richedit.h>
#include <commctrl.h>

HWND console;

// util function for rich edit
namespace rich_edit {
CHARFORMAT get_char_fmt(HWND hwnd, DWORD range = SCF_DEFAULT) {
CHARFORMAT cf;
SendMessage(hwnd, EM_GETCHARFORMAT, range, (LPARAM)&cf);
return cf;
}
void set_char_fmt(HWND hwnd, const CHARFORMAT& cf, DWORD range = SCF_DEFAULT) {
SendMessage(hwnd, EM_SETCHARFORMAT, range, (LPARAM)&cf);
}
void replace_sel(HWND hwnd, const char* str) {
SendMessage(hwnd, EM_REPLACESEL, 0, (LPARAM)str);
}
void cursor_to_bottom(HWND hwnd) {
SendMessage(hwnd, EM_SETSEL, -2, -1);
}
void scroll_to(HWND hwnd, DWORD pos) {
SendMessage(hwnd, WM_VSCROLL, pos, 0);
}
void scroll_to_bottom(HWND hwnd) {
scroll_to(hwnd, SB_BOTTOM);
}
// this function is used to output text in different color
void append(HWND hwnd, COLORREF clr, const char* str) {
cursor_to_bottom(hwnd); // move cursor to bottom

CHARFORMAT cf = get_char_fmt(hwnd); // get default char format
cf.cbSize = sizeof(cf);
cf.dwMask = CFM_COLOR; // change color
cf.crTextColor = clr;

set_char_fmt(hwnd, cf); // set default char format

replace_sel(hwnd, str); // code from google
scroll_to_bottom(hwnd); // scroll to bottom
}
}

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int main() {

LoadLibrary("riched20.dll"); // for using rich editstatic char szAppName[] = "winhello";
HWND        hwnd;
MSG         msg;
WNDCLASSEX  wndclass;

wndclass.cbSize         = sizeof(wndclass);
wndclass.style          = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc    = WndProc;
wndclass.cbClsExtra     = 0;
wndclass.cbWndExtra     = 0;
wndclass.hInstance      = GetModuleHandle(0);
wndclass.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hIconSm        = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor        = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground  = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszClassName  = szAppName;
wndclass.lpszMenuName   = NULL;

RegisterClassEx(&wndclass);

hwnd = CreateWindow(szAppName, "Hello, world!",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
400, 300,
NULL, NULL, GetModuleHandle(0), NULL);

ShowWindow(hwnd, SW_SHOW);
UpdateWindow(hwnd);

while ( GetMessage(&msg, NULL, 0, 0) ) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) {
switch ( iMsg ) {
case WM_CREATE:
console = CreateWindow(RICHEDIT_CLASS, "",
WS_CHILD | ES_SAVESEL | ES_NOHIDESEL | WS_CHILDWINDOW | WS_BORDER | WS_VISIBLE | ES_MULTILINE | WS_VSCROLL | WS_EX_STATICEDGE,
0, 0, 300, 200, hwnd, 0, GetModuleHandle(0), 0);

// output a red string
rich_edit::append(console, RGB(255, 0, 0), "aaaa\n");

return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, iMsg, wParam, lParam);
}

Линия:

rich_edit :: append (console, RGB (255, 0, 0), «aaaa \ n»);

должен выводить красную строку, но на самом деле это черный, почему это?

Благодарю.