Hello,
I've written a program for a usb controller. I want to change some data
strings for another project so that program code remains the same. Some data
is hardcoded like
BYTE code UsbRomStringsLangId[] = {
4, // Length of language descriptor ID
3, // LANGID tag
9, // Low byte of 0x0409 (English)
4 // High byte of 0x0409 (English)
};
BYTE code UsbRomAcmInterfaceString[USB_ACM_INTERFACE_STRING_LENGTH] = {
USB_ACM_INTERFACE_STRING_LENGTH, DESC_TYPE_STRING, //"CDC-ACM Comm"
'C', 0, 'D', 0, 'C', 0, ' ', 0, 'A', 0, 'C', 0, 'M', 0, ' ', 0, 'C', 0,
'o', 0, 'm', 0, 'm', 0, 0, 0};
BYTE code UsbRomCdcInterfaceString[USB_CDC_INTERFACE_STRING_LENGTH] = {
USB_CDC_INTERFACE_STRING_LENGTH, DESC_TYPE_STRING,
'C', 0, 'D', 0, 'C', 0, ' ', 0, 'A', 0, 'C', 0, 'M', 0, ' ', 0, 'D', 0,
'a', 0, 't', 0, 'a', 0, 0, 0};
How can I do that?
--
comp.lang.c.moderated - moderation address: cl**@plethora.net 3 1180
"valentin tihomirov" <va*********************@abelectron.com> wrote in
message news:cl****************@plethora.net... Hello, I've written a program for a usb controller. I want to change some data strings for another project so that program code remains the same. Some
data is hardcoded like
BYTE code UsbRomStringsLangId[] = { 4, // Length of language descriptor ID 3, // LANGID tag 9, // Low byte of 0x0409 (English) 4 // High byte of 0x0409 (English) }; BYTE code UsbRomAcmInterfaceString[USB_ACM_INTERFACE_STRING_LENGTH] = { USB_ACM_INTERFACE_STRING_LENGTH, DESC_TYPE_STRING, //"CDC-ACM Comm" 'C', 0, 'D', 0, 'C', 0, ' ', 0, 'A', 0, 'C', 0, 'M', 0, ' ', 0, 'C', 0, 'o', 0, 'm', 0, 'm', 0, 0, 0}; BYTE code UsbRomCdcInterfaceString[USB_CDC_INTERFACE_STRING_LENGTH] = { USB_CDC_INTERFACE_STRING_LENGTH, DESC_TYPE_STRING, 'C', 0, 'D', 0, 'C', 0, ' ', 0, 'A', 0, 'C', 0, 'M', 0, ' ', 0, 'D', 0, 'a', 0, 't', 0, 'a', 0, 0, 0};
How can I do that?
Remove the hardcoding, store your strings externally (e.g. in a file
or 'registry', etc.), and have the programs load them.
-Mike
"valentin tihomirov" <va*********************@abelectron.com> wrote in message news:<cl****************@plethora.net>... Hello, I've written a program for a usb controller. I want to change some data strings for another project so that program code remains the same. Some data is hardcoded like
BYTE code UsbRomStringsLangId[] = { 4, // Length of language descriptor ID 3, // LANGID tag 9, // Low byte of 0x0409 (English) 4 // High byte of 0x0409 (English) }; BYTE code UsbRomAcmInterfaceString[USB_ACM_INTERFACE_STRING_LENGTH] = { USB_ACM_INTERFACE_STRING_LENGTH, DESC_TYPE_STRING, //"CDC-ACM Comm" 'C', 0, 'D', 0, 'C', 0, ' ', 0, 'A', 0, 'C', 0, 'M', 0, ' ', 0, 'C', 0, 'o', 0, 'm', 0, 'm', 0, 0, 0}; BYTE code UsbRomCdcInterfaceString[USB_CDC_INTERFACE_STRING_LENGTH] = { USB_CDC_INTERFACE_STRING_LENGTH, DESC_TYPE_STRING, 'C', 0, 'D', 0, 'C', 0, ' ', 0, 'A', 0, 'C', 0, 'M', 0, ' ', 0, 'D', 0, 'a', 0, 't', 0, 'a', 0, 0, 0};
How can I do that?
Rather than defining these variables at compile time do so at runtime
during initialisation. Write a function to convert a string into the
form you need, so:
interleave_with_zero("CDC-ACM Comm")
returns 'C', 0, 'D', 0, 'C', 0, ...
You should do something like this anyway, for clarity.
valentin tihomirov wrote: Hello, I've written a program for a usb controller. I want to change some data strings for another project so that program code remains the same. Some data is hardcoded like
BYTE code UsbRomStringsLangId[] = { 4, // Length of language descriptor ID 3, // LANGID tag 9, // Low byte of 0x0409 (English) 4 // High byte of 0x0409 (English) };
.....
A common way is to use conditional coding for the variant parts:
#if SYSTEM==SYSTEM_A
const char foo[] = {"init sys A"};
#elif SYSTEM==SYSTEM_B
const char foo[] = {"init sys B"};
#else
#error SYSTEM undefined
#endif
You can have your makefile or project file define SYSTEM for the
perspective build.
Another way is to isolate all the system-dependent items in a module
which ONLY holds the dependent items and only compile the version that
matches the target being generated.
Thad
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