ctypes return char array with null chars
in [Python]
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From: chris cannady on 19 Apr 2010 05:29 Hi all, I am passing a ctypes struct byref to a dll. When I get the struct back, it looks like the char array in the struct was truncated at the first null char. It should be 192 bytes long, but I know the 3rd through 6th byte are null chars and the array was truncated right before byte 3. Is there any way to get the full array back including null chars? Thanks
From: Mark Tolonen on 19 Apr 2010 11:01
"chris cannady" <booog35(a)gmail.com> wrote in message news:b103e85a-05d5-4195-a18f-bd143e9f57b8(a)b33g2000yqc.googlegroups.com... > Hi all, > > I am passing a ctypes struct byref to a dll. When I get the struct > back, it looks like the char array in the struct was truncated at the > first null char. It should be 192 bytes long, but I know the 3rd > through 6th byte are null chars and the array was truncated right > before byte 3. > > Is there any way to get the full array back including null chars? > > Thanks It could depend on how your struct is declared. Maybe this demo will help? >>> x=(c_char*10)() >>> x <__main__.c_char_Array_10 object at 0x00A049E0> >>> x.raw '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' >>> x.value '' 'value' prints it is a string, stopping at the first null. 'raw' dumps the whole array. -Mark |