我正在尝试向窗口添加缩略图按钮,但没有出现错误,也没有显示缩略图按钮。我阅读了以下页面以供引用:
环境:win10 64位,vs2015
// function WindowProc and wWinMain are copied from msdn directly.
#include "stdafx.h"
#include <windows.h>
#include "shobjidl.h"
#include <exception>
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
HRESULT addThumbnailButtons(HWND hwnd) {
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
if (SUCCEEDED(hr)) {
ITaskbarList4* ptbl = nullptr;
HRESULT hr = CoCreateInstance(CLSID_TaskbarList, NULL, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&ptbl));
if (SUCCEEDED(hr)) {
// create 2 buttons
THUMBBUTTON thmb[2] = {};
thmb[0].dwMask = THB_TOOLTIP;
thmb[0].iId = 0;
wcscpy_s(thmb[0].szTip, L"Button 1");
thmb[1].dwMask = THB_TOOLTIP;
thmb[1].iId = 1;
wcscpy_s(thmb[1].szTip, L"Button 2");
//ptbl->HrInit();
hr = ptbl->ThumbBarAddButtons(hwnd, ARRAYSIZE(thmb), thmb);
ptbl->Release();
return hr;
}
else {
throw std::exception("createInstance failed");
}
}else{
throw std::exception("coinitialize failed");
}
}
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;
}
HRESULT hr = addThumbnailButtons(hwnd);
if (FAILED(hr)) {
throw std::exception("addbuttons failed");
}
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);
}
最佳答案
根据 ITaskBarList3
文档:
When an application displays a window, its taskbar button is created by the system. When the button is in place, the taskbar sends a
TaskbarButtonCreated
message to the window. Your application should callRegisterWindowMessage(L"TaskbarButtonCreated")
and handle that message in its wndproc. That message must be received by your application before it calls any ITaskbarList3 method.
在调用 addThumbnailButtons()
之前必须等待该消息,例如:
UINT uMsgTaskbarCreated;
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
uMsgTaskbarCreated = RegisterWindowMessage(L"TaskbarButtonCreated");
// 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;
}
default:
if ((uMsg == uMsgTaskbarCreated) && (uMsgTaskbarCreated != 0))
{
HRESULT hr = addThumbnailButtons(hwnd);
if (FAILED(hr)) {
...;
}
}
break;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
关于c++ - 无法将缩略图按钮添加到窗口?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38028623/