GetWindowText example

main.cpp

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <tchar.h>

LPCWSTR szWindowClass = L"MYWINDOW";

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	const int size = 24;
	BOOL res;
	switch (message)
	{
	case WM_CREATE:
		
		wchar_t name[size];
		memset(name, 0, size);

		res = GetWindowTextW(hWnd, name, size);
		if (res == FALSE) wprintf(L"GetWindowTextW Error!\n");

		wprintf(L"%ls / %d\n", name, GetWindowTextLengthW(hWnd)); //Test Player / 11
		
		break;
	case WM_PAINT:
	{
		PAINTSTRUCT ps;
		HDC hdc = BeginPaint(hWnd, &ps);
		LineTo(hdc, 50, 50);
		EndPaint(hWnd, &ps);
	}
	break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEXW wcex = { 0 };

	wcex.cbSize = sizeof(WNDCLASSEX);

	wcex.style = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc = WndProc;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = hInstance;
	wcex.hIcon = LoadIcon(nullptr, IDI_APPLICATION);
	wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
	wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	
	wcex.lpszClassName = szWindowClass;
	wcex.hIconSm = LoadIcon(nullptr, IDI_APPLICATION);

	return RegisterClassExW(&wcex);
}


int main(int argc, char **argv)
{
	HINSTANCE hInstance = GetModuleHandle(NULL);

	ATOM atom = MyRegisterClass(hInstance);
	
	HWND MainWindow = CreateWindowExW(
		WS_EX_TOPMOST,
		szWindowClass,
		L"Test Player",
		WS_POPUPWINDOW | SW_HIDE,
		0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN),
		nullptr, nullptr, hInstance, nullptr);

	MSG msg;
	while (GetMessage(&msg, nullptr, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	getchar();
	return 0;
}