win32 Notes

2022-09-19

I'm gonna probably add to this over time

Spawn a console:

AllocConsole();
FILE* fDummy;
freopen_s(&fDummy, "CONOUT$", "w", stdout);

Get the number of lines scrolled with the mousewheel:

case WM_MOUSEWHEEL: {
    UINT scrollLines;
    SystemParametersInfoA(SPI_GETWHEELSCROLLLINES, 0, &scrollLines, 0);
    short deltaLines = (short)scrollLines * (GET_WHEEL_DELTA_WPARAM(wParam) / WHEEL_DELTA); //result
    return 0;
}

This code will open a folder select dialog and print the path of the selected folder, followed by the names of all the files and folders within that folder:

#include <shobjidl_core.h>
#include <Shlguid.h>
//...

IFileDialog *pfd;
IShellItem *psi, *fpsi;
PWSTR path = NULL;
IEnumShellItems *pes;
if (SUCCEEDED(CoCreateInstance(&CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, &IID_IFileOpenDialog, &pfd))){
    pfd->lpVtbl->SetOptions(pfd, FOS_PICKFOLDERS);
    pfd->lpVtbl->Show(pfd, hwnd);
    if (SUCCEEDED(pfd->lpVtbl->GetResult(pfd, &psi))){
        if (SUCCEEDED(psi->lpVtbl->GetDisplayName(psi, SIGDN_FILESYSPATH, &path))){
            print_wstr(path); //prints folder path
            CoTaskMemFree(path);
            if (SUCCEEDED(psi->lpVtbl->BindToHandler(psi, NULL, &BHID_EnumItems, &IID_IEnumShellItems, &pes))){
                while (S_OK == pes->lpVtbl->Next(pes, 1, &fpsi, NULL)){
                    if (SUCCEEDED(fpsi->lpVtbl->GetDisplayName(fpsi, SIGDN_PARENTRELATIVEPARSING, &path))){
                        print_wstr(path); //prints item name
                        CoTaskMemFree(path);
                    }
                    fpsi->lpVtbl->Release(fpsi);
                }
                pes->lpVtbl->Release(pes);
            }
        }
        psi->lpVtbl->Release(psi);
    }
    pfd->lpVtbl->Release(pfd);
}

The print_wstr function is just for demonstration. Also, the strings returned by GetDisplayName are NULL terminated.