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Sweden-Number/dlls/comctl32/taskdialog.c

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/*
* Task dialog control
*
* Copyright 2017 Fabian Maurer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#define NONAMELESSUNION
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "commctrl.h"
#include "winerror.h"
#include "comctl32.h"
#include "wine/debug.h"
#include "wine/list.h"
#include "wine/unicode.h"
WINE_DEFAULT_DEBUG_CHANNEL(taskdialog);
#define ALIGNED_LENGTH(_Len, _Align) (((_Len)+(_Align))&~(_Align))
#define ALIGNED_POINTER(_Ptr, _Align) ((LPVOID)ALIGNED_LENGTH((ULONG_PTR)(_Ptr), _Align))
#define ALIGN_LENGTH(_Len, _Align) _Len = ALIGNED_LENGTH(_Len, _Align)
#define ALIGN_POINTER(_Ptr, _Align) _Ptr = ALIGNED_POINTER(_Ptr, _Align)
static const UINT DIALOG_MIN_WIDTH = 240;
static const UINT DIALOG_SPACING = 5;
static const UINT DIALOG_BUTTON_WIDTH = 50;
static const UINT DIALOG_BUTTON_HEIGHT = 14;
static const UINT DIALOG_TIMER_MS = 200;
static const UINT ID_MAIN_INSTRUCTION = 0xf000;
static const UINT ID_CONTENT = 0xf001;
static const UINT ID_TIMER = 1;
struct taskdialog_control
{
struct list entry;
DLGITEMTEMPLATE *template;
unsigned int template_size;
};
struct taskdialog_button_desc
{
int id;
const WCHAR *text;
unsigned int width;
unsigned int line;
HINSTANCE hinst;
};
struct taskdialog_template_desc
{
const TASKDIALOGCONFIG *taskconfig;
unsigned int dialog_height;
unsigned int dialog_width;
struct list controls;
WORD control_count;
LONG x_baseunit;
LONG y_baseunit;
HFONT font;
struct taskdialog_button_desc *default_button;
};
struct taskdialog_info
{
HWND hwnd;
const TASKDIALOGCONFIG *taskconfig;
DWORD last_timer_tick;
HFONT main_instruction_font;
};
static void pixels_to_dialogunits(const struct taskdialog_template_desc *desc, LONG *width, LONG *height)
{
if (width)
*width = MulDiv(*width, 4, desc->x_baseunit);
if (height)
*height = MulDiv(*height, 8, desc->y_baseunit);
}
static void dialogunits_to_pixels(const struct taskdialog_template_desc *desc, LONG *width, LONG *height)
{
if (width)
*width = MulDiv(*width, desc->x_baseunit, 4);
if (height)
*height = MulDiv(*height, desc->y_baseunit, 8);
}
static void template_write_data(char **ptr, const void *src, unsigned int size)
{
memcpy(*ptr, src, size);
*ptr += size;
}
static void taskdialog_set_main_instruction_font(struct taskdialog_info *dialog_info)
{
NONCLIENTMETRICSW ncm;
HWND hwnd;
hwnd = GetDlgItem(dialog_info->hwnd, ID_MAIN_INSTRUCTION);
if(!hwnd) return;
ncm.cbSize = sizeof(ncm);
SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, ncm.cbSize, &ncm, 0);
/* 1.25 times the height */
ncm.lfMessageFont.lfHeight = ncm.lfMessageFont.lfHeight * 5 / 4;
ncm.lfMessageFont.lfWeight = FW_BOLD;
dialog_info->main_instruction_font = CreateFontIndirectW(&ncm.lfMessageFont);
SendMessageW(hwnd, WM_SETFONT, (WPARAM)dialog_info->main_instruction_font, TRUE);
}
/* used to calculate size for the controls */
static void taskdialog_get_text_extent(const struct taskdialog_template_desc *desc, const WCHAR *text,
BOOL user_resource, SIZE *sz)
{
RECT rect = { 0, 0, desc->dialog_width - DIALOG_SPACING * 2, 0}; /* padding left and right of the control */
const WCHAR *textW = NULL;
static const WCHAR nulW;
unsigned int length;
HFONT oldfont;
HDC hdc;
if (IS_INTRESOURCE(text))
{
if (!(length = LoadStringW(user_resource ? desc->taskconfig->hInstance : COMCTL32_hModule,
(UINT_PTR)text, (WCHAR *)&textW, 0)))
{
WARN("Failed to load text\n");
textW = &nulW;
length = 0;
}
}
else
{
textW = text;
length = strlenW(textW);
}
hdc = GetDC(0);
oldfont = SelectObject(hdc, desc->font);
dialogunits_to_pixels(desc, &rect.right, NULL);
DrawTextW(hdc, textW, length, &rect, DT_LEFT | DT_EXPANDTABS | DT_CALCRECT | DT_WORDBREAK);
pixels_to_dialogunits(desc, &rect.right, &rect.bottom);
SelectObject(hdc, oldfont);
ReleaseDC(0, hdc);
sz->cx = rect.right - rect.left;
sz->cy = rect.bottom - rect.top;
}
static unsigned int taskdialog_add_control(struct taskdialog_template_desc *desc, WORD id, const WCHAR *class,
HINSTANCE hInstance, const WCHAR *text, DWORD style, short x, short y, short cx, short cy)
{
struct taskdialog_control *control = Alloc(sizeof(*control));
unsigned int size, class_size, text_size;
DLGITEMTEMPLATE *template;
static const WCHAR nulW;
const WCHAR *textW;
char *ptr;
class_size = (strlenW(class) + 1) * sizeof(WCHAR);
if (IS_INTRESOURCE(text))
text_size = LoadStringW(hInstance, (UINT_PTR)text, (WCHAR *)&textW, 0) * sizeof(WCHAR);
else
{
textW = text;
text_size = strlenW(textW) * sizeof(WCHAR);
}
size = sizeof(DLGITEMTEMPLATE);
size += class_size;
size += text_size + sizeof(WCHAR);
size += sizeof(WORD); /* creation data */
control->template = template = Alloc(size);
control->template_size = size;
template->style = WS_VISIBLE | style;
template->dwExtendedStyle = 0;
template->x = x;
template->y = y;
template->cx = cx;
template->cy = cy;
template->id = id;
ptr = (char *)(template + 1);
template_write_data(&ptr, class, class_size);
template_write_data(&ptr, textW, text_size);
template_write_data(&ptr, &nulW, sizeof(nulW));
list_add_tail(&desc->controls, &control->entry);
desc->control_count++;
return ALIGNED_LENGTH(size, 3);
}
static unsigned int taskdialog_add_static_label(struct taskdialog_template_desc *desc, WORD id, const WCHAR *str)
{
unsigned int size;
SIZE sz;
if (!str)
return 0;
taskdialog_get_text_extent(desc, str, TRUE, &sz);
desc->dialog_height += DIALOG_SPACING;
size = taskdialog_add_control(desc, id, WC_STATICW, desc->taskconfig->hInstance, str, 0, DIALOG_SPACING,
desc->dialog_height, sz.cx, sz.cy);
desc->dialog_height += sz.cy + DIALOG_SPACING;
return size;
}
static unsigned int taskdialog_add_main_instruction(struct taskdialog_template_desc *desc)
{
return taskdialog_add_static_label(desc, ID_MAIN_INSTRUCTION, desc->taskconfig->pszMainInstruction);
}
static unsigned int taskdialog_add_content(struct taskdialog_template_desc *desc)
{
return taskdialog_add_static_label(desc, ID_CONTENT, desc->taskconfig->pszContent);
}
static void taskdialog_init_button(struct taskdialog_button_desc *button, struct taskdialog_template_desc *desc,
int id, const WCHAR *text, BOOL custom_button)
{
SIZE sz;
taskdialog_get_text_extent(desc, text, custom_button, &sz);
button->id = id;
button->text = text;
button->width = max(DIALOG_BUTTON_WIDTH, sz.cx + DIALOG_SPACING * 2);
button->line = 0;
button->hinst = custom_button ? desc->taskconfig->hInstance : COMCTL32_hModule;
if (id == desc->taskconfig->nDefaultButton)
desc->default_button = button;
}
static void taskdialog_init_common_buttons(struct taskdialog_template_desc *desc, struct taskdialog_button_desc *buttons,
unsigned int *button_count)
{
DWORD flags = desc->taskconfig->dwCommonButtons;
#define TASKDIALOG_INIT_COMMON_BUTTON(id) \
do { \
taskdialog_init_button(&buttons[(*button_count)++], desc, ID##id, MAKEINTRESOURCEW(IDS_BUTTON_##id), FALSE); \
} while(0)
if (flags & TDCBF_OK_BUTTON)
TASKDIALOG_INIT_COMMON_BUTTON(OK);
if (flags & TDCBF_YES_BUTTON)
TASKDIALOG_INIT_COMMON_BUTTON(YES);
if (flags & TDCBF_NO_BUTTON)
TASKDIALOG_INIT_COMMON_BUTTON(NO);
if (flags & TDCBF_RETRY_BUTTON)
TASKDIALOG_INIT_COMMON_BUTTON(RETRY);
if (flags & TDCBF_CANCEL_BUTTON)
TASKDIALOG_INIT_COMMON_BUTTON(CANCEL);
if (flags & TDCBF_CLOSE_BUTTON)
TASKDIALOG_INIT_COMMON_BUTTON(CLOSE);
#undef TASKDIALOG_INIT_COMMON_BUTTON
}
static unsigned int taskdialog_add_buttons(struct taskdialog_template_desc *desc)
{
unsigned int count = 0, buttons_size, i, line_count, size = 0;
unsigned int location_x, *line_widths, alignment = ~0u;
const TASKDIALOGCONFIG *taskconfig = desc->taskconfig;
struct taskdialog_button_desc *buttons;
/* Allocate enough memory for the custom and the default buttons. Maximum 6 default buttons possible. */
buttons_size = 6;
if (taskconfig->cButtons && taskconfig->pButtons)
buttons_size += taskconfig->cButtons;
if (!(buttons = Alloc(buttons_size * sizeof(*buttons))))
return 0;
/* Custom buttons */
if (taskconfig->cButtons && taskconfig->pButtons)
for (i = 0; i < taskconfig->cButtons; i++)
taskdialog_init_button(&buttons[count++], desc, taskconfig->pButtons[i].nButtonID,
taskconfig->pButtons[i].pszButtonText, TRUE);
/* Common buttons */
taskdialog_init_common_buttons(desc, buttons, &count);
/* There must be at least one button */
if (count == 0)
taskdialog_init_button(&buttons[count++], desc, IDOK, MAKEINTRESOURCEW(IDS_BUTTON_OK), FALSE);
if (!desc->default_button)
desc->default_button = &buttons[0];
/* For easy handling just allocate as many lines as buttons, the worst case. */
line_widths = Alloc(count * sizeof(*line_widths));
/* Separate buttons into lines */
location_x = DIALOG_SPACING;
for (i = 0, line_count = 0; i < count; i++)
{
if (location_x + buttons[i].width + DIALOG_SPACING > desc->dialog_width)
{
location_x = DIALOG_SPACING;
line_count++;
}
buttons[i].line = line_count;
location_x += buttons[i].width + DIALOG_SPACING;
line_widths[line_count] += buttons[i].width + DIALOG_SPACING;
}
line_count++;
/* Try to balance lines so they are about the same size */
for (i = 1; i < line_count - 1; i++)
{
int diff_now = abs(line_widths[i] - line_widths[i - 1]);
unsigned int j, last_button = 0;
int diff_changed;
for (j = 0; j < count; j++)
if (buttons[j].line == i - 1)
last_button = j;
/* Difference in length of both lines if we wrapped the last button from the last line into this one */
diff_changed = abs(2 * buttons[last_button].width + line_widths[i] - line_widths[i - 1]);
if (diff_changed < diff_now)
{
buttons[last_button].line = i;
line_widths[i] += buttons[last_button].width;
line_widths[i - 1] -= buttons[last_button].width;
}
}
/* Calculate left alignment so all lines are as far right as possible. */
for (i = 0; i < line_count; i++)
{
int new_alignment = desc->dialog_width - line_widths[i];
if (new_alignment < alignment)
alignment = new_alignment;
}
/* Now that we got them all positioned, create all buttons */
location_x = alignment;
for (i = 0; i < count; i++)
{
DWORD style = &buttons[i] == desc->default_button ? BS_DEFPUSHBUTTON : BS_PUSHBUTTON;
if (i > 0 && buttons[i].line != buttons[i - 1].line) /* New line */
{
location_x = alignment;
desc->dialog_height += DIALOG_BUTTON_HEIGHT + DIALOG_SPACING;
}
size += taskdialog_add_control(desc, buttons[i].id, WC_BUTTONW, buttons[i].hinst, buttons[i].text, style,
location_x, desc->dialog_height, buttons[i].width, DIALOG_BUTTON_HEIGHT);
location_x += buttons[i].width + DIALOG_SPACING;
}
/* Add height for last row and spacing */
desc->dialog_height += DIALOG_BUTTON_HEIGHT + DIALOG_SPACING;
Free(line_widths);
Free(buttons);
return size;
}
static void taskdialog_clear_controls(struct list *controls)
{
struct taskdialog_control *control, *control2;
LIST_FOR_EACH_ENTRY_SAFE(control, control2, controls, struct taskdialog_control, entry)
{
list_remove(&control->entry);
Free(control->template);
Free(control);
}
}
static unsigned int taskdialog_get_reference_rect(const struct taskdialog_template_desc *desc, RECT *ret)
{
HMONITOR monitor = MonitorFromWindow(desc->taskconfig->hwndParent ? desc->taskconfig->hwndParent : GetActiveWindow(),
MONITOR_DEFAULTTOPRIMARY);
MONITORINFO info;
info.cbSize = sizeof(info);
GetMonitorInfoW(monitor, &info);
if (desc->taskconfig->dwFlags & TDF_POSITION_RELATIVE_TO_WINDOW && desc->taskconfig->hwndParent)
GetWindowRect(desc->taskconfig->hwndParent, ret);
else
*ret = info.rcWork;
pixels_to_dialogunits(desc, &ret->left, &ret->top);
pixels_to_dialogunits(desc, &ret->right, &ret->bottom);
pixels_to_dialogunits(desc, &info.rcWork.left, &info.rcWork.top);
pixels_to_dialogunits(desc, &info.rcWork.right, &info.rcWork.bottom);
return info.rcWork.right - info.rcWork.left;
}
static WCHAR *taskdialog_get_exe_name(const TASKDIALOGCONFIG *taskconfig, WCHAR *name, DWORD length)
{
DWORD len = GetModuleFileNameW(NULL, name, length);
if (len && len < length)
{
WCHAR *p;
if ((p = strrchrW(name, '/'))) name = p + 1;
if ((p = strrchrW(name, '\\'))) name = p + 1;
return name;
}
else
return NULL;
}
static DLGTEMPLATE *create_taskdialog_template(const TASKDIALOGCONFIG *taskconfig)
{
struct taskdialog_control *control, *control2;
unsigned int size, title_size, screen_width;
struct taskdialog_template_desc desc;
static const WORD fontsize = 0x7fff;
static const WCHAR emptyW[] = { 0 };
const WCHAR *titleW = NULL;
DLGTEMPLATE *template;
NONCLIENTMETRICSW ncm;
WCHAR pathW[MAX_PATH];
RECT ref_rect;
char *ptr;
HDC hdc;
/* Window title */
if (!taskconfig->pszWindowTitle)
titleW = taskdialog_get_exe_name(taskconfig, pathW, ARRAY_SIZE(pathW));
else if (IS_INTRESOURCE(taskconfig->pszWindowTitle))
{
if (!LoadStringW(taskconfig->hInstance, LOWORD(taskconfig->pszWindowTitle), (WCHAR *)&titleW, 0))
titleW = taskdialog_get_exe_name(taskconfig, pathW, ARRAY_SIZE(pathW));
}
else
titleW = taskconfig->pszWindowTitle;
if (!titleW)
titleW = emptyW;
title_size = (strlenW(titleW) + 1) * sizeof(WCHAR);
size = sizeof(DLGTEMPLATE) + 2 * sizeof(WORD);
size += title_size;
size += 2; /* font size */
list_init(&desc.controls);
desc.taskconfig = taskconfig;
desc.control_count = 0;
ncm.cbSize = sizeof(ncm);
SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, ncm.cbSize, &ncm, 0);
desc.font = CreateFontIndirectW(&ncm.lfMessageFont);
hdc = GetDC(0);
SelectObject(hdc, desc.font);
desc.x_baseunit = GdiGetCharDimensions(hdc, NULL, &desc.y_baseunit);
ReleaseDC(0, hdc);
screen_width = taskdialog_get_reference_rect(&desc, &ref_rect);
desc.dialog_height = 0;
desc.dialog_width = max(taskconfig->cxWidth, DIALOG_MIN_WIDTH);
desc.dialog_width = min(desc.dialog_width, screen_width);
desc.default_button = NULL;
size += taskdialog_add_main_instruction(&desc);
size += taskdialog_add_content(&desc);
size += taskdialog_add_buttons(&desc);
template = Alloc(size);
if (!template)
{
taskdialog_clear_controls(&desc.controls);
DeleteObject(desc.font);
return NULL;
}
template->style = DS_MODALFRAME | DS_SETFONT | WS_CAPTION | WS_VISIBLE | WS_SYSMENU;
if (taskconfig->dwFlags & TDF_CAN_BE_MINIMIZED) template->style |= WS_MINIMIZEBOX;
if (!(taskconfig->dwFlags & TDF_NO_SET_FOREGROUND)) template->style |= DS_SETFOREGROUND;
if (taskconfig->dwFlags & TDF_RTL_LAYOUT) template->dwExtendedStyle = WS_EX_LAYOUTRTL | WS_EX_RIGHT | WS_EX_RTLREADING;
template->cdit = desc.control_count;
template->x = (ref_rect.left + ref_rect.right + desc.dialog_width) / 2;
template->y = (ref_rect.top + ref_rect.bottom + desc.dialog_height) / 2;
template->cx = desc.dialog_width;
template->cy = desc.dialog_height;
ptr = (char *)(template + 1);
ptr += 2; /* menu */
ptr += 2; /* class */
template_write_data(&ptr, titleW, title_size);
template_write_data(&ptr, &fontsize, sizeof(fontsize));
/* write control entries */
LIST_FOR_EACH_ENTRY_SAFE(control, control2, &desc.controls, struct taskdialog_control, entry)
{
ALIGN_POINTER(ptr, 3);
template_write_data(&ptr, control->template, control->template_size);
/* list item won't be needed later */
list_remove(&control->entry);
Free(control->template);
Free(control);
}
DeleteObject(desc.font);
return template;
}
static HRESULT taskdialog_notify(struct taskdialog_info *dialog_info, UINT notification, WPARAM wparam, LPARAM lparam)
{
const TASKDIALOGCONFIG *taskconfig = dialog_info->taskconfig;
return taskconfig->pfCallback
? taskconfig->pfCallback(dialog_info->hwnd, notification, wparam, lparam, taskconfig->lpCallbackData)
: S_OK;
}
static void taskdialog_on_button_click(struct taskdialog_info *dialog_info, WORD command_id)
{
if (taskdialog_notify(dialog_info, TDN_BUTTON_CLICKED, command_id, 0) == S_OK)
EndDialog(dialog_info->hwnd, command_id);
}
static void taskdialog_init(struct taskdialog_info *dialog_info, HWND hwnd)
{
const TASKDIALOGCONFIG *taskconfig = dialog_info->taskconfig;
dialog_info->hwnd = hwnd;
if (taskconfig->dwFlags & TDF_CALLBACK_TIMER)
{
SetTimer(hwnd, ID_TIMER, DIALOG_TIMER_MS, NULL);
dialog_info->last_timer_tick = GetTickCount();
}
taskdialog_set_main_instruction_font(dialog_info);
}
static INT_PTR CALLBACK taskdialog_proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static const WCHAR taskdialog_info_propnameW[] = {'T','a','s','k','D','i','a','l','o','g','I','n','f','o',0};
struct taskdialog_info *dialog_info;
TRACE("hwnd=%p msg=0x%04x wparam=%lx lparam=%lx\n", hwnd, msg, wParam, lParam);
if (msg != WM_INITDIALOG)
dialog_info = GetPropW(hwnd, taskdialog_info_propnameW);
switch (msg)
{
case TDM_CLICK_BUTTON:
taskdialog_on_button_click(dialog_info, LOWORD(wParam));
break;
case WM_INITDIALOG:
dialog_info = (struct taskdialog_info *)lParam;
taskdialog_init(dialog_info, hwnd);
SetPropW(hwnd, taskdialog_info_propnameW, dialog_info);
taskdialog_notify(dialog_info, TDN_DIALOG_CONSTRUCTED, 0, 0);
taskdialog_notify(dialog_info, TDN_CREATED, 0, 0);
break;
case WM_COMMAND:
if (HIWORD(wParam) == BN_CLICKED)
{
taskdialog_on_button_click(dialog_info, LOWORD(wParam));
break;
}
return FALSE;
case WM_HELP:
taskdialog_notify(dialog_info, TDN_HELP, 0, 0);
break;
case WM_TIMER:
if (ID_TIMER == wParam)
{
DWORD elapsed = GetTickCount() - dialog_info->last_timer_tick;
if (taskdialog_notify(dialog_info, TDN_TIMER, elapsed, 0) == S_FALSE)
dialog_info->last_timer_tick = GetTickCount();
}
break;
case WM_DESTROY:
taskdialog_notify(dialog_info, TDN_DESTROYED, 0, 0);
RemovePropW(hwnd, taskdialog_info_propnameW);
if (dialog_info->taskconfig->dwFlags & TDF_CALLBACK_TIMER)
KillTimer(hwnd, ID_TIMER);
if (dialog_info->main_instruction_font)
DeleteObject(dialog_info->main_instruction_font);
break;
default:
return FALSE;
}
return TRUE;
}
/***********************************************************************
* TaskDialogIndirect [COMCTL32.@]
*/
HRESULT WINAPI TaskDialogIndirect(const TASKDIALOGCONFIG *taskconfig, int *button,
int *radio_button, BOOL *verification_flag_checked)
{
struct taskdialog_info dialog_info;
DLGTEMPLATE *template;
INT ret;
TRACE("%p, %p, %p, %p\n", taskconfig, button, radio_button, verification_flag_checked);
if (!taskconfig || taskconfig->cbSize != sizeof(TASKDIALOGCONFIG))
return E_INVALIDARG;
dialog_info.taskconfig = taskconfig;
template = create_taskdialog_template(taskconfig);
ret = (short)DialogBoxIndirectParamW(taskconfig->hInstance, template, taskconfig->hwndParent,
taskdialog_proc, (LPARAM)&dialog_info);
Free(template);
if (button) *button = ret;
if (radio_button) *radio_button = taskconfig->nDefaultButton;
if (verification_flag_checked) *verification_flag_checked = TRUE;
return S_OK;
}
/***********************************************************************
* TaskDialog [COMCTL32.@]
*/
HRESULT WINAPI TaskDialog(HWND owner, HINSTANCE hinst, const WCHAR *title, const WCHAR *main_instruction,
const WCHAR *content, TASKDIALOG_COMMON_BUTTON_FLAGS common_buttons, const WCHAR *icon, int *button)
{
TASKDIALOGCONFIG taskconfig;
TRACE("%p, %p, %s, %s, %s, %#x, %s, %p\n", owner, hinst, debugstr_w(title), debugstr_w(main_instruction),
debugstr_w(content), common_buttons, debugstr_w(icon), button);
memset(&taskconfig, 0, sizeof(taskconfig));
taskconfig.cbSize = sizeof(taskconfig);
taskconfig.hwndParent = owner;
taskconfig.hInstance = hinst;
taskconfig.dwCommonButtons = common_buttons;
taskconfig.pszWindowTitle = title;
taskconfig.u.pszMainIcon = icon;
taskconfig.pszMainInstruction = main_instruction;
taskconfig.pszContent = content;
return TaskDialogIndirect(&taskconfig, button, NULL, NULL);
}
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