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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "app/win/hwnd_util.h"
#include "base/string_util.h"
namespace app {
namespace win {
string16 GetClassName(HWND window) {
// GetClassNameW will return a truncated result (properly null terminated) if
// the given buffer is not large enough. So, it is not possible to determine
// that we got the entire class name if the result is exactly equal to the
// size of the buffer minus one.
DWORD buffer_size = MAX_PATH;
while (true) {
std::wstring output;
DWORD size_ret =
GetClassNameW(window, WriteInto(&output, buffer_size), buffer_size);
if (size_ret == 0)
break;
if (size_ret < (buffer_size - 1)) {
output.resize(size_ret);
return output;
}
buffer_size *= 2;
}
return std::wstring(); // error
}
#pragma warning(push)
#pragma warning(disable:4312 4244)
WNDPROC SetWindowProc(HWND hwnd, WNDPROC proc) {
// The reason we don't return the SetwindowLongPtr() value is that it returns
// the orignal window procedure and not the current one. I don't know if it is
// a bug or an intended feature.
WNDPROC oldwindow_proc =
reinterpret_cast<WNDPROC>(GetWindowLongPtr(hwnd, GWLP_WNDPROC));
SetWindowLongPtr(hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(proc));
return oldwindow_proc;
}
void* SetWindowUserData(HWND hwnd, void* user_data) {
return
reinterpret_cast<void*>(SetWindowLongPtr(hwnd, GWLP_USERDATA,
reinterpret_cast<LONG_PTR>(user_data)));
}
void* GetWindowUserData(HWND hwnd) {
return reinterpret_cast<void*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
}
#pragma warning(pop)
} // namespace win
} // namespace app
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