如何从SysListView32获取位图数据？

#include <windows.h>
#include <Commctrl.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrev,
                   LPSTR cmdLine, int showCmd)
{
    CoInitialize(NULL);

    // find Progman
    HWND hProgman = FindWindow("Progman", "Program Manager");

    // find DefView
    HWND hDefView = FindWindowEx(hProgman, NULL, "SHELLDLL_DefView",  NULL);

    // find SysListView
    HWND hListView = FindWindowEx(hDefView, NULL, "SysListView32", NULL);

    char filename[512] = {0};

    LVBKIMAGE lvbki;
    lvbki.ulFlags = LVBKIF_SOURCE_HBITMAP;
    lvbki.hbm = NULL;
    lvbki.pszImage = filename;
    lvbki.cchImageMax = 512;
    lvbki.xOffsetPercent = 0;
    lvbki.yOffsetPercent = 0;

    int ret = ListView_GetBkImage(hListView, &lvbki);

    if (ret == 0) {
        MessageBox(NULL, TEXT("GetBkImage failed!"), TEXT("err"), 0);
        return -1;
    }
if (lvbki.hbm == NULL){
    MessageBox(NULL, TEXT("hbm is NULL"), TEXT("err"), 0);
    return -1;
}

    MessageBox(NULL, TEXT("FINISHED"), TEXT("msg"), 0);

    CoUninitialize();

    return 0;
}