I first encountered this song in The Inkspots's 1944 version with which they tried to jump on the bandwagon of Dick Haymes' hit (Decca 18597). They gave it their typical "Top & Bottom" treatment (tenor, talking bass, tenor), which does grow old after a while. Dick Haymes's version, in contrast, with James' muted trumpet in the background, stays fresh even after listening to it a couple of times.
Before Haymes, by the way, the song was a hit as early as 1929. Ruth Etting's performance on Columbia 1733-D offers an interesting contrast:
Here is the first release of Harry James' version of "I'll Get By (As Long As I Have You)", with vocal by Dick Haymes, which would become a #1 chart hit three years later, amidst the recording ban.
On this single, however, "I'll Get By" is the apparent B-side only, recorded some months before "Lost In Love" (also sung by Haymes) but not used then.
The whole record was not mentioned at all in Billboard when it came out and it seemed it would sink without a trace - until Irene Dunne sang "I'll Get By (As Long As I Have You)" to Spencer Tracy in the movie A Guy Named Joe, premiered on December 23, 1943.
As the recording ban prevented new recordings of the song, juke box operators were looking for available records - and found this one which eventually made it to the juke box chart of the Billboard March 18, 1944 issue, as a territorial favorite (St. Louis).
Columbia lost no time in releasing it once again, on cat# 36698, announcing it as "new hit", which it would actually become, further propelled by another film use in Follow the Boys where it was sung by Dinah Shore (premiered April 25, 1944).