A example for starting a new program minimized using RBTray

example.cpp

#include <windows.h>
#include <string>
#include <tlhelp32.h>
#include <shellapi.h>
using namespace std;

#define WM_ADDTRAY  0x0401
#define NAME L"RBTrayHook"


struct handle_data {
    unsigned long process_id;
    HWND window_handle;
};


BOOL is_main_window(HWND handle)
{
    return (GetWindow(handle, GW_OWNER) == (HWND)0) & IsWindowVisible(handle);
}


BOOL CALLBACK enum_windows_callback(HWND handle, LPARAM lParam)
{
    handle_data& data = *(handle_data*)lParam;
    unsigned long process_id = 0;
    GetWindowThreadProcessId(handle, &process_id);
    if (data.process_id != process_id || !is_main_window(handle))
        return TRUE;
    data.window_handle = handle;
    return FALSE;
}


HWND find_main_window(unsigned long process_id)
{
    handle_data data;
    data.process_id = process_id;
    data.window_handle = 0;
    while (true)
    {
        EnumWindows(enum_windows_callback, (LPARAM)&data);
        if (data.window_handle != 0)
        {
            return data.window_handle;
        }
        Sleep(50);
    }
}


int getProcID(const string& p_name)
{
    while (true) {
        HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
        PROCESSENTRY32 structprocsnapshot = { 0 };

        structprocsnapshot.dwSize = sizeof(PROCESSENTRY32);

        if (snapshot == INVALID_HANDLE_VALUE)return 0;
        if (Process32First(snapshot, &structprocsnapshot) == FALSE)return 0;
        while (Process32Next(snapshot, &structprocsnapshot))
        {
            int iSize;
            char* pszMultiByte;
            iSize = WideCharToMultiByte(CP_ACP, 0, structprocsnapshot.szExeFile, -1, NULL, 0, NULL, NULL); //iSize =wcslen(pwsUnicode)+1=6
            pszMultiByte = (char*)malloc(iSize * sizeof(char)); 
            WideCharToMultiByte(CP_ACP, 0, structprocsnapshot.szExeFile, -1, pszMultiByte, iSize, NULL, NULL);
            if (!strcmp(pszMultiByte, p_name.c_str()))
            {
                CloseHandle(snapshot);
                return structprocsnapshot.th32ProcessID;
            }
        }
        Sleep(50);
    }
}


int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE /*hPrevInstance*/, _In_ LPSTR /*szCmdLine*/, _In_ int /*iCmdShow*/)
{
    int tmp = getProcID("RBTray.exe"); // wait start
    char cmd[] = "D:/Program Files/Zotero/zotero.exe";
    HINSTANCE hs = ShellExecuteA(NULL, "open", cmd, "", NULL, SW_MINIMIZE);
    int pid = getProcID("zotero.exe");
    HWND _hwnd = find_main_window(pid);

    PostMessage(FindWindow(NAME, NAME), WM_ADDTRAY, 0, (LPARAM)_hwnd);
    return WM_QUIT;
}