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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 67%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EN%3C/text%3E%3C/svg%3E)
I created a simple win32 program, first create a window, its background is black. Then create its child window, but the background color of the child window is gray, not transparent. How to deal with making it transparent?
Handle WM_CTLCOLORSTATIC
Call SetBkMode with TRANSPARENT
and
return (LRESULT)GetStockObject( HOLLOW_BRUSH );
Test :
@Castorix31 I tried it, but when I `#if defined _M_IX86
With CC version 6, add WM_PRINTCLIENT
I tested both on Windows 10 21H1
And post code by formatting it correctly with the Code button or Ctrl + K...
I think this is the most appropriate way to make controls transparent.
I'm not quite sure what you mean, could you elaborate on that? Or show me your code? I don't really understand how to add WM_PRINTCLIENT, or do I treat it like WM_CTLCOLORSTATIC? Just like that:
LRESULT CALLBACK WndProc (HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch (Message)
{
case WM_PRINTCLIENT:
case WM_CTLCOLORBTN:
case WM_CTLCOLORSTATIC:
SetBkMode ((HDC) wParam, TRANSPARENT);
return (INT_PTR) GetStockObject ((NULL_BRUSH));
// ....
}
}
But it doesn't work :(
case WM_PRINTCLIENT:
case WM_PAINT:
Paint(hWnd, (HDC)wParam, hBitmapBackground);
break;
where Paint() is a function like this Paint test
Thanks a lot! I think I see what you mean. It does work, though it still doesn't solve my problem. Because I put multiple radio buttons into a group box, just like that:
hGroupBox = CreateWindowEx (WS_EX_TRANSPARENT, "button", "Proxy Settings",
WS_CHILD | WS_VISIBLE | BS_GROUPBOX, 10, 10, 320, 100,
hwnd, (HMENU) 1013, hInstance, NULL);
hrbtn1 = CreateWindow ("button", "Don't use proxy",
WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON, 10, 20, 150, 25,
hGroupBox, (HMENU) 1014, hInstance, NULL);
hrbtn2 = CreateWindow ("button", "Use IE proxy",
WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON, 10, 50, 150, 25,
hGroupBox, (HMENU) 1015, hInstance, NULL);
// ...
My guess is that since the radio button is a child window of the group box and not a child window of the main window, there is no way for its messages to reach the message queue of the main window. My current solution is not to use a group box but to customize a child window and rewrite its WndProc, then put radio buttons inside it. I wonder if you have a better solution?
Radio buttons must not be childs of the GroupBox, but normal childs of the main window
Sounds amazing, but why? Is it possible, as I suspect, the radio button messages cannot reach the message queue in the main window? Well, if that's true, then I think the GroupBox is useless because any controls in a GroupBox will have a incorrect background color :(
I added a GroupBox for the 2 first Radio buttons and and it works normally :
And radio buttons are the childs of the GroupBox?
No, they must be childs of the main window
Well, it looks like it has to be. This means that GroupBox can only be used as a border... Thanks a lot! ヾ(≧▽≦*)o
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 79%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EK0%3C/text%3E%3C/svg%3E)
WM_CTLCOLORSTATIC messages are received by the parent window. If the radio button is inside a group box, process the group box's message.
SetWindowSubclass, RemoveWindowSubclass, DefSubclassProc may be useful.
Hello,
Welcome to Microsoft Q&A!
You can set the control's background color to be the same as the background.
case WM_CTLCOLORSTATIC:
if ((HWND)lParam == GetDlgItem(hWnd, IDB_RES))
{
HWND hbn = (HWND)lParam;
HDC hdc = (HDC)wParam;
RECT rc;
TCHAR text[64];
GetWindowText(hbn, text, 63);
GetClientRect(hbn, &rc);
SetTextColor(hdc, RGB(255, 255, 255));
SetBkMode(hdc, TRANSPARENT);
DrawText(hdc, text, _tcslen(text), &rc, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
return (INT_PTR)CreateSolidBrush(RGB(0,0,255));
}
break;
Thank you.
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@Junjie Zhu - MSFT IDB_RES is not defined
It's preferred to refer to @Petrus 【KIM】 's answer. WM_CTLCOLORSTATIC is the most suitable message.
HI, @Ni_Yin ,It's been a long time. Have you solved the problem now ?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 91%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPK%3C/text%3E%3C/svg%3E)
Well.... You did it...but remove some code....then retry...
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);
if (!hWnd)
{
return FALSE;
}
HWND hWnds[2][4];
hWnds[1][0] = CreateWindowEx(WS_EX_TRANSPARENT, L"BUTTON", L"AAAAA", WS_CHILD | BS_GROUPBOX | BS_TEXT | WS_GROUP | WS_VISIBLE, 10, 10, 120, 125, hWnd, (HMENU)0, hInstance, nullptr);
hWnds[0][0] = CreateWindowEx(0L, L"BUTTON", L"BBBBB", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE, 10, 30, 120, 35, hWnd, (HMENU)0, hInstance, nullptr);
hWnds[0][1] = CreateWindowEx(0L, L"BUTTON", L"CCCCC", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE, 10, 65, 120, 35, hWnd, (HMENU)0, hInstance, nullptr);
hWnds[0][2] = CreateWindowEx(0L, L"BUTTON", L"DDDDD", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE, 10, 100, 120, 35, hWnd, (HMENU)0, hInstance, nullptr);
hWnds[0][3] = CreateWindowEx(0L, L"STATIC", L"EEEEE", WS_CHILD | WS_VISIBLE, 0, 150, 120, 35, hWnd, (HMENU)0, hInstance, nullptr);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
......
case WM_CTLCOLORSTATIC:
{
HDC hdc = (HDC)wParam;
SetBkMode(hdc, TRANSPARENT);
SetTextColor(hdc, RGB(0x00, 0x00, 0xFF));
return (LRESULT)GetStockObject(NULL_BRUSH);
}
......
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
Show me your code....
Your group box is suspicious....
IDD_ABOUTBOX DIALOGEX 0, 0, 269, 155
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About MFCApplication1"
FONT 8, "MS Shell Dlg", 0, 0, 0x1
BEGIN
GROUPBOX "Static",IDC_STATIC,43,15,194,102,0,WS_EX_TRANSPARENT
ICON IDR_MAINFRAME,IDC_STATIC,14,14,20,20
LTEXT "MFCApplication1, Version 1.0",IDC_STATIC,57,34,114,8,SS_NOPREFIX
LTEXT "Copyright (C) 2021",IDC_STATIC,57,50,114,8
DEFPUSHBUTTON "OK",IDOK,212,134,50,14,WS_GROUP
CONTROL "Radio1",IDC_RADIO1,"Button",BS_AUTORADIOBUTTON,55,66,42,10
CONTROL "Radio2",IDC_RADIO2,"Button",BS_AUTORADIOBUTTON,55,84,38,10
CONTROL "Radio3",IDC_RADIO3,"Button",BS_AUTORADIOBUTTON,55,102,38,10
END
@Petrus 【KIM】 This is not an MFC application
#include "framework.h"
#include "test2.h"
if defined M_IX86
#pragma comment(linker,"/manifestdependency:"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language=''"")
elif defined M_X64
#pragma comment(linker,"/manifestdependency:"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='amd64' publicKeyToken='6595b64144ccf1df' language=''"")
else
#pragma comment(linker,"/manifestdependency:"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='' publicKeyToken='6595b64144ccf1df' language=''"")
endif
HINSTANCE hInst; // 当前实例WCHAR szTitleMAX_LOADSTRING=L"hello"; // 标题栏文本WCHAR szWindowClassMAX_LOADSTRING=L"hellos"; // 主窗口类名bool AppsUseLightTheme = true;bool AutoChangeThemeColor = true;unsigned char FocusMAX_FOCUS = { 0, 0 };unsigned char MaxFocusMAX_FOCUS - 1 = { 3 };
ATOM MyRegisterClass(HINSTANCE hInstance);int InitInstance(HINSTANCE, int);LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);void AutoChangeColor(HWND hWnd);void ColorChangeToLight(HWND hWnd);void ColorChangeToDark(HWND hWnd);
int APIENTRY wWinMain(In HINSTANCE hInstance,In_opt HINSTANCE hPrevInstance,In LPWSTR lpCmdLine,In int nCmdShow){
MainRectangle a;
a.mainrectangle.SetHight(11);
a.mainrectangle.SetWidth(23);
if (a.mainrectangle.GetArea() == 11 * 23)
{
MessageBox(NULL, L"提示", L"提示", MB_OK);
}
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: 在此处放置代码。
if (!MyRegisterClass(hInstance)) {
return FALSE;
}
// 执行应用程序初始化:
return InitInstance(hInstance, nCmdShow);
}
ATOM MyRegisterClass(HINSTANCE hInstance){WNDCLASSEXW wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW|CS_OWNDC;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wcex.lpszMenuName = szWindowClass;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);
return RegisterClassExW(&wcex);
}
int InitInstance(HINSTANCE hInstance, int nCmdShow){
HWND hWnd = CreateWindowEx(NULL, szWindowClass, szTitle, WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);
if (!hWnd)
{
return FALSE;
}
HWND hWnds[MAX_FOCUS][MAX_WINDOW];
hWnds[MAX_FOCUS - 1][0] = CreateWindowEx(NULL, L"button", L"颜色模式", WS_CHILD | WS_VISIBLE | BS_GROUPBOX, 0, 0, 120, 125, hWnd, HMENU(10), hInstance, nullptr);
hWnds[0][0] = CreateWindowEx(NULL, L"button", L"亮色模式", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE | WS_TABSTOP, 0, 20, 120, 35, hWnd, HMENU(LightMode), hInstance, nullptr);
hWnds[0][1] = CreateWindowEx(NULL, L"button", L"暗色模式", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE | WS_TABSTOP, 0, 55, 120, 35, hWnd, HMENU(DarkMode), hInstance, nullptr);
hWnds[0][2] = CreateWindowEx(NULL, L"button", L"自动模式", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE | WS_TABSTOP, 0, 90, 120, 35, hWnd, HMENU(AutoColor), hInstance, nullptr);
hWnds[0][3] = CreateWindowEx(NULL, L"static", L"自动模式", WS_CHILD | WS_VISIBLE, 0, 130, 120, 35, hWnd, nullptr, hInstance, nullptr);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
SetFocus(hWnds[Focus[0]][Focus[1]]);
MSG msg;
// 主消息循环:
while (GetMessage(&msg, nullptr, 0, 0))
{
TranslateMessage(&msg);
if (msg.message == WM_KEYDOWN) {
if (msg.wParam == VK_DOWN) {
if (Focus[1] <= MaxFocus[Focus[0]] - 2) {
Focus[1]++;
}
else {
Focus[1] = 0;
}
SetFocus(hWnds[Focus[0]][Focus[1]]);
}
if (msg.wParam == VK_UP) {
if (Focus[1] >= 1) {
Focus[1]--;
}
else {
Focus[1] = MaxFocus[Focus[0]] - 1;
}
SetFocus(hWnds[Focus[0]][Focus[1]]);
}
if (msg.wParam == VK_ESCAPE) {
PostMessage(hWnd, WM_DESTROY, NULL, NULL);
}
}
DispatchMessage(&msg);
if (AutoChangeThemeColor)
{
AutoChangeColor(hWnd);
}
}
return (int)msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){switch (message){case WM_COMMAND:{int wmId = LOWORD(wParam);switch (wmId){case LightMode:AutoChangeThemeColor = false;ColorChangeToLight(hWnd);AppsUseLightTheme = true;break;case DarkMode:AutoChangeThemeColor = false;ColorChangeToDark(hWnd);AppsUseLightTheme = false;break;case AutoColor://DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);AutoChangeThemeColor = true;break;default:return DefWindowProc(hWnd, message, wParam, lParam);}}break;case WM_PAINT:{PAINTSTRUCT ps;InvalidateRect(hWnd, NULL, TRUE);HDC hdc = BeginPaint(hWnd, &ps);EndPaint(hWnd, &ps);}break;
case WM_CTLCOLORSTATIC:
if (AppsUseLightTheme) {
SetTextColor((HDC)wParam, RGB(0, 0, 0));
}
else {
SetTextColor((HDC)wParam, RGB(255, 255, 255));
}
SetBkMode((HDC)wParam, TRANSPARENT);
return (BOOL)((HBRUSH)GetStockObject(NULL_BRUSH));
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// “关于”框的消息处理程序。INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){UNREFERENCED_PARAMETER(lParam);switch (message){case WM_INITDIALOG:return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
void AutoChangeColor(HWND hWnd){HKEY phkResult;TCHAR Result=L"\0";DWORD lpcbData=sizeof(Result);if (RegOpenKeyEx(HKEY_CURRENT_USER, L"SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize", NULL, KEY_EXECUTE, &phkResult)== ERROR_SUCCESS){if (RegQueryValueEx(phkResult, L"AppsUseLightTheme", NULL, NULL, (LPBYTE)Result, &lpcbData) == ERROR_SUCCESS){if (!(!Result0) != AppsUseLightTheme){AppsUseLightTheme = !AppsUseLightTheme;if (AppsUseLightTheme){ColorChangeToLight(hWnd);}else{ColorChangeToDark(hWnd);}}}}RegCloseKey(phkResult);}
void ColorChangeToLight(HWND hWnd){SetClassLong(hWnd, GCL_HBRBACKGROUND, (long)(HBRUSH)GetStockObject(WHITE_BRUSH));PostMessage(hWnd, WM_PAINT, NULL, NULL);}
void ColorChangeToDark(HWND hWnd){SetClassLong(hWnd, GCL_HBRBACKGROUND, (long)CreateSolidBrush(RGB(25, 25, 25)));PostMessage(hWnd, WM_PAINT, NULL, NULL);}