I'm trying to change the icon of my Windows application. I'm using the simple window code below and added a resource.h and resource.rc to the solution. I'm using a test.ico and a test2.ico-file which both contain 64x64, 32x32, 24x24 and 16x16 sizes.
The when I switch between icon and icon2 by simple changing this line TESTICON ICON "test.ico" to TESTICON ICON "test2.ico" in the .rc-file, the icons change accordingly in program header bar, taskbar and alt-tab view. But the icon in my windows explorer is acting totally strange. When I set the view to details,list or small I see the test.ico-icon, but for medium, large and extra large I see the test2.ico-icon, no matter what I set in the .rc-file. I'm totally lost here, which setting am I missing?
The 'resource.h'
#pragma once
#define TESTICON 1
and the 'resource.rc'
#include "resource.h"
TESTICON ICON "test.ico"
The simple windows source:
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include "resource.h"
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASSEX wc = { };
//Step 1: Registering the Window Class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WindowProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wc.lpszMenuName = NULL;
wc.lpszClassName = CLASS_NAME;
wc.hIcon = (HICON)LoadImage(hInstance,
MAKEINTRESOURCE(TESTICON), IMAGE_ICON,
::GetSystemMetrics(SM_CXICON),
::GetSystemMetrics(SM_CYICON), 0);
wc.hIconSm = (HICON)LoadImage(hInstance,
MAKEINTRESOURCE(TESTICON), IMAGE_ICON,
::GetSystemMetrics(SM_CXSMICON),
::GetSystemMetrics(SM_CYSMICON), 0);
RegisterClassEx(&wc);
// Create the window.
HWND hwnd = CreateWindowEx(
0, // Optional window styles.
CLASS_NAME, // Window class
L"Learn to Program Windows", // Window text
WS_OVERLAPPEDWINDOW, // Window style
// Size and position
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
// Run the message loop.
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
// All painting occurs here, between BeginPaint and EndPaint.
FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
As pointed out by Jonathan Potter: Explorer has an icon cache; if it's showing the wrong icon you probably need to clear the cache.
http://leodavidson.blogspot.com/2011/05/clear-icon-cache-1001.html
Related
My goal is to create a custom maximize button for my app and I also want to trigger snap layouts menu on the button on Windows 11. For that, I am following the guide from here, but it doesn't work.
Here is the sample code, For testing purpose, I take a rectangle {point(0,0), size(200,200)} and when the mouse is over it and I receive WM_NCHITTEST message I return the HTMAXBUTTON as instructed in the guide but the snap layouts menu doesn't show up.
#include <stdio.h>
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <windowsx.h>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
// Create the window.
HWND hwnd = CreateWindowEx(
0, // Optional window styles.
CLASS_NAME, // Window class
L"Test Window", // Window text
WS_OVERLAPPEDWINDOW, // Window style
// Size and position
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
// Run the message loop.
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
// All painting occurs here, between BeginPaint and EndPaint.
FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));
EndPaint(hwnd, &ps);
}
return 0;
case WM_NCHITTEST:
{
// Get the point in screen coordinates.
// GET_X_LPARAM and GET_Y_LPARAM are defined in windowsx.h
POINT point = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
// Map the point to client coordinates.
::MapWindowPoints(nullptr, hwnd, &point, 1);
RECT maximizeRect {0, 0, 200, 200};
// If the point is in your maximize button then return HTMAXBUTTON
if (::PtInRect(&maximizeRect, point))
{
printf("maxmize button rect %d\n", rand());
fflush(stdout);
return HTMAXBUTTON;
}
break;
}
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
At the beginning, custom title bar before supporting the snap layouts menu
maximizeRect is client coordinates and not the maximize button rectangle.
The WM_NCHITTEST return value is wrong. If the point is in your maximize button then return HTMAXBUTTON.
There is a HitTestNCA example which calculates in the screen coordinate instead of the client coordinate and works fine. Another win32-window-custom-titlebar sample.
I am new to using international languages in my win32 program in C++. I have a simple window created with an edit field inside. I want to set a chinese hardcoded text into the edit field. I am using SetWindowText but the output has only question marks and | character. What am I missing? My code file is pasted below. I have tried WM_SETTEXT but no luck.
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <strsafe.h>
#include <iostream>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
// Create the window.
HWND hwnd = CreateWindowEx(
0, // Optional window styles.
CLASS_NAME, // Window class
L"Learn to Program Windows", // Window text
WS_OVERLAPPEDWINDOW, // Window style
// Size and position
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
if (hwnd == NULL)
{
return 0;
}
HWND edit = CreateWindowEx(0, L"Edit", L"", WS_CHILD | WS_VISIBLE | WS_BORDER, 0, 0, 200, 50, hwnd, NULL, hInstance, NULL);
SetWindowTextW(edit, L"銷售回扣");
//SendMessage(edit, WM_SETTEXT, 0, (LPARAM)(L"銷售回扣"));
ShowWindow(hwnd, nCmdShow);
// Run the message loop.
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
// All painting occurs here, between BeginPaint and EndPaint.
FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
Here's a simple Win32 Application that I copied from the official MSDN docs (link):
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
// Create the window.
HWND hwnd = CreateWindowEx(
0, // Optional window styles.
CLASS_NAME, // Window class
L"Learn to Program Windows", // Window text
WS_OVERLAPPEDWINDOW, // Window style
// Size and position
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
// Run the message loop.
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_DESKTOP+1));
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
The only difference is I used COLOR_DESKTOP instead of COLOR_WINDOW in FillRect() (this problem occurs in both the cases).
Whenever I resize the window, the bottom border keeps disappearing and then reappearing as I resize it further. Can anyone tell what's happening?
Here's GIF to show the bottom border disappearing when resizing:
I suggest you could try to enable DPI awareness: Property -> Manifest Tool ->Input and Output -> DPI Awareness.
I just started to learn windows app development in c++ and I found some program code on Microsoft docs that all it should do is open simple window. I tried to build it on visual studio and it was built but it didn't run. And when I tried to compile and run it with the local debugger I got some error that I have no idea what is it about. I'd like to get some help with it.
Here is the code and the error message.
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
// Create the window.
HWND hwnd = CreateWindowEx(
0, // Optional window styles.
CLASS_NAME, // Window class
L"Learn to Program Windows", // Window text
WS_OVERLAPPEDWINDOW, // Window style
// Size and position
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
// Run the message loop.
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
I am trying to create a listview in C++ with the win32 api, however the code supplied on mdsn is giving me an error.
HWND CreateListView (HWND hwndParent)
{
INITCOMMONCONTROLSEX icex; // Structure for control initialization.
icex.dwICC = ICC_LISTVIEW_CLASSES;
InitCommonControlsEx(&icex);
RECT rcClient; // The parent window's client area.
GetClientRect (hwndParent, &rcClient);
// Create the list-view window in report view with label editing enabled.
HWND hWndListView = CreateWindow(WC_LISTVIEW, //ERROR red line under create window
L"",
WS_CHILD | LVS_REPORT | LVS_EDITLABELS,
0, 0,
rcClient.right - rcClient.left,
rcClient.bottom - rcClient.top,
hwndParent,
(HMENU)IDM_CODE_SAMPLES, //ERROR IDM CODE SAMPLES undefined
g_hInst, //ERROR
NULL);
return (hWndListView);
}
This example is strait from mdsn and I have no idea why it is not working. I am getting IDM_CODE_SAMPLES Undefined, and something wrong with createwindow. Please help me to get this working it would be really helpful.
IDM_CODE_SAMPLES is the ID you want to assign to your control. You can either define the symbol to a numeric value, or use the numeric value directly (choose 100, for example). The ID is useful if you want to reference a particular control, although its HWND is equally useful as an ID.
g_hInst is presumably a global variable of type HMODULE, initialized from WinMain. If you don't want to use the global variable, you can call GetModuleHandle(nullptr) in its place, provided that you are compiling an .exe as opposed to a .dll.
You'll get a lot of helpful information when working through Intro to Win32 programming in C++.
I am now getting an error (1 unresolved externals)
We can find from InitCommonControlsEx function.
Ensures that the common control DLL (Comctl32.dll) is loaded, and
registers specific common control classes from the DLL.
Add:
#include <commctrl.h>
#pragma comment(lib,"Comctl32.lib")
Minimal code example:
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <commctrl.h>
#pragma comment(lib,"Comctl32.lib")
#define IDM_CODE_SAMPLES 101
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
HWND CreateListView(HWND hwndParent);
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
// Register the window class.
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
// Create the window.
HWND hwnd = CreateWindowEx(
0, // Optional window styles.
CLASS_NAME, // Window class
L"Learn to Program Windows", // Window text
WS_OVERLAPPEDWINDOW, // Window style
// Size and position
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, // Parent window
NULL, // Menu
hInstance, // Instance handle
NULL // Additional application data
);
CreateListView(hwnd);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
// Run the message loop.
MSG msg = { };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
EndPaint(hwnd, &ps);
}
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
HWND CreateListView(HWND hwndParent)
{
INITCOMMONCONTROLSEX icex; // Structure for control initialization.
icex.dwICC = ICC_LISTVIEW_CLASSES;
InitCommonControlsEx(&icex);
RECT rcClient; // The parent window's client area.
GetClientRect(hwndParent, &rcClient);
// Create the list-view window in report view with label editing enabled.
HWND hWndListView = CreateWindow(WC_LISTVIEW, //ERROR red line under create window
L"",
WS_CHILD | LVS_REPORT | LVS_EDITLABELS,
0, 0,
rcClient.right - rcClient.left,
rcClient.bottom - rcClient.top,
hwndParent,
(HMENU)IDM_CODE_SAMPLES, //ERROR IDM CODE SAMPLES undefined
GetModuleHandle(nullptr), //ERROR
NULL);
return (hWndListView);
}
Just in case someone else is having issues around SysListView32:
#include <Ole2.h>
OleInitialize(NULL);
#include <commctrl.h>
#pragma comment(lib, "Shlwapi.lib")
#pragma comment(lib, "comctl32.lib")
INITCOMMONCONTROLSEX InitCtrls;
InitCtrls.dwICC = ICC_LISTVIEW_CLASSES;
InitCtrls.dwSize = sizeof(INITCOMMONCONTROLSEX);
BOOL bRet = InitCommonControlsEx(&InitCtrls);
...
For reference: fully working example with bells and whistles: https://github.com/jjYBdx4IL/Win32-List-View