Using TaskDialog DLL

#include <Windows.h>
#include <stdio.h>

#define TD_WARNING_ICON         MAKEINTRESOURCEW(-1)
#define TD_ERROR_ICON           MAKEINTRESOURCEW(-2)
#define TD_INFORMATION_ICON     MAKEINTRESOURCEW(-3)
#define TD_SHIELD_ICON          MAKEINTRESOURCEW(-4)
enum _TASKDIALOG_COMMON_BUTTON_FLAGS
{
    TDCBF_OK_BUTTON            = 0x0001, // selected control return value IDOK
    TDCBF_YES_BUTTON           = 0x0002, // selected control return value IDYES
    TDCBF_NO_BUTTON            = 0x0004, // selected control return value IDNO
    TDCBF_CANCEL_BUTTON        = 0x0008, // selected control return value IDCANCEL
    TDCBF_RETRY_BUTTON         = 0x0010, // selected control return value IDRETRY
    TDCBF_CLOSE_BUTTON         = 0x0020  // selected control return value IDCLOSE
};
typedef int TASKDIALOG_COMMON_BUTTON_FLAGS;           // Note: _TASKDIALOG_COMMON_BUTTON_FLAGS is an int
typedef HRESULT (*TaskDialog_t)(HWND, HINSTANCE, PCWSTR, PCWSTR, PCWSTR, TASKDIALOG_COMMON_BUTTON_FLAGS, PCWSTR, int*);

int main(){
    HANDLE lib = LoadLibrary("Libs\\TaskDialog.dll");
    if(!lib){
        puts("Library not found!");
        return 1;
    }
    TaskDialog_t TaskDialog = (TaskDialog_t)GetProcAddress(lib, "TaskDialog");
    if(!TaskDialog){
        puts("Function in library not found!");
        FreeLibrary(lib);
        return 2;
    }
    int button_pressed = 0;
    if(TaskDialog(
        NULL, /* hWndParent */
        NULL, /* hInstance */
        L"TaskDialog - Title", /* pszWindowTitle */
        L"TaskDialog - Instruction", /* pszMainInstruction */
        L"TaskDialog - Content", /* pszContent */
        TDCBF_OK_BUTTON | TDCBF_CANCEL_BUTTON, /* dwCommonButtons */
        TD_INFORMATION_ICON, /* pszIcon */
        &button_pressed /* *pnButton */
    ) != S_OK){
        puts("Function call failed!");
        FreeLibrary(lib);
        return 3;
    }
    puts(button_pressed == IDOK ? "OK" : "Cancel");
    FreeLibrary(lib);
    return 0;
}