I've made a small click-to-copy clipboard util in WinAPI that doesn't steal focus, stays on top of all windows, can be dragged and simulates Ctrl+V keystrokes if needed.
What can be improved and are there any pitfalls I am overseeing? I am aware of checking if the call to Clipboard succeeded and that I should avoid this one:
(WPARAM)GetStockObject(DEFAULT_GUI_FONT)
Here is the source code:
// A tool to quickly copy the strings to clipboard
#pragma comment(linker,"\"/manifestdependency:type='win32' \
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
#include <windows.h>
#include "resource.h"
#include <string>
static wchar_t szWindowClass[] = L"myclass2.0";
static wchar_t szTitle[] = L"Ron's utils";
HINSTANCE hInst;
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
//=========================== global constants ===========================
// positions and dimensions
const int formydelta = 95;
const int formwidth = 775;
const int formheight = 55;
const int buttony = 15;
const int buttonx = 15;
const int buttonxdelta = 85;
BOOL pastedirectly = false;
// hard coded strings
const std::string sotexthelp = "Please take [the tour](https://stackoverflow.com/tour) and read [the help page](https://stackoverflow.com/help). Welcome to SO.";
const std::string sotextbooks = "Sounds like you could benefit from reading one of [these C++ books](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list).";
//========================================================================
// copy to clipboard function
void copytoclipboard(const std::string& s){
HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, s.size() + 1);
memcpy((LPWSTR)GlobalLock(hMem), s.c_str(), s.size() + 1);
GlobalUnlock(hMem);
OpenClipboard(0);
EmptyClipboard();
if (!SetClipboardData(CF_TEXT, hMem)){
GlobalFree(hMem);
}
CloseClipboard();
}
// paste from clipboard function:
void pastefromclipboard(){
if (pastedirectly) {
INPUT myinput[4];
SecureZeroMemory(myinput, sizeof(myinput));
myinput[0].type = INPUT_KEYBOARD;
myinput[0].ki.wVk = VK_LCONTROL;
myinput[1].type = INPUT_KEYBOARD;
myinput[1].ki.wVk = 'V';
myinput[2].type = INPUT_KEYBOARD;
myinput[2].ki.wVk = 'V';
myinput[2].ki.dwFlags = KEYEVENTF_KEYUP;
myinput[3].type = INPUT_KEYBOARD;
myinput[3].ki.wVk = VK_LCONTROL;
myinput[3].ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(4, myinput, sizeof(INPUT));
}
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DROPSHADOW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_ICON1));
if (!RegisterClassEx(&wcex)){
MessageBox(NULL, L"Call to RegisterClassEx failed!", L"cppexamples.com", NULL);
return 1;
}
hInst = hInstance;
HWND hWnd = CreateWindowEx(
WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST,
szWindowClass,
szTitle,
WS_POPUP | WS_BORDER | WS_VISIBLE,
((GetSystemMetrics(SM_CXSCREEN) - formwidth) / 2), (GetSystemMetrics(SM_CYSCREEN) - formydelta),
formwidth, // width
formheight, // height
NULL,
NULL,
hInstance,
NULL
);
if (!hWnd){
MessageBox(NULL, L"Call to CreateWindow failed!", L"cppexamples.com", NULL);
return 1;
}
SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
PAINTSTRUCT ps;
HDC hdc;
switch (message){
case WM_CREATE:
{
// button 1
HWND hwndButton = CreateWindow(
L"BUTTON",
L"Email",
WS_VISIBLE | WS_CHILD,
buttonx, // x position
buttony, // y position
75, // width
24, // height
hWnd,
(HMENU)101, // ID
hInst,
NULL);
SendMessage(hwndButton, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), 0);
// code for other buttons omitted
// button exit
HWND hwndButton110 = CreateWindow(
L"BUTTON",
L"Exit",
WS_VISIBLE | WS_CHILD,
formwidth - 90,
buttony,
75,
24,
hWnd,
(HMENU)110,
hInst,
NULL);
SendMessage(hwndButton110, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), 0);
//checkbox
HWND hwndCheckBox = CreateWindowEx(0, L"BUTTON", L"Paste directly",
BS_AUTOCHECKBOX | WS_CHILD | WS_VISIBLE,
formwidth - 180, buttony + 3,
90, 20,
hWnd,
(HMENU)111,
hInst,
0);
SendMessage(hwndCheckBox, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), 0);
}
break;
case WM_COMMAND: // process commands
switch (LOWORD(wParam)) {
case 101:
{
copytoclipboard("sample string 1");
pastefromclipboard();
}
break;
// code for other buttons omitted
case 110:
{
OpenClipboard(0);
EmptyClipboard();
PostQuitMessage(0);
}
break;
case 111: // checkbox
{
pastedirectly = IsDlgButtonChecked(hWnd, 111);
}
break;
}
break;
case WM_NCHITTEST: {
LRESULT hit = DefWindowProc(hWnd, message, wParam, lParam);
if (hit == HTCLIENT) hit = HTCAPTION;
return hit;
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
return 0;
}
