bitmap() doesn't finish with file in Windows (PR#7224)
This is deliberate, as processing can take a long time and we don't want to lock R whilst a printer prints a file for example. Just insert a sleep(1). It certainly is not a bug, as no one said you would be able to access a file immediately.
On Mon, 13 Sep 2004 t.short@epri-peac.com wrote:
Full_Name: Tom Short
Version: 1.9.0
OS: Win2000
Submission from: (NULL) (64.65.255.41)
POSSIBLE WISHLIST, POSSIBLE BUG:
The following code works on Debian, but fails on Windows 2000 with 'Error in
file("test.png", "r") : unable to open connection':
bitmap("test.png")
plot(c(1,2,3))
dev.off()
x = file("test.png","r")
The problem is that when bitmap uses ghostscript to convert the PS file to a
PNG, the postscript drive doesn't wait for ghostscript to finish (under
Windows). In the Linux version, the postscript driver does wait for the printing
command to finish. Compare the following lines of devPS.c that actually call the
"cmd":
#ifdef Unix
err = R_system(buff);
#endif
#ifdef Win32
err = runcmd(buff, 0, 0, NULL);
#endif
RECOMMENDATION: Change runcmd(buff, 0, 0, NULL) to runcmd(buff, 1, 0, NULL) in
devPS.c to make the driver wait for the command to finish.
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