Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
Relevant replacement documents include:
PublicUtility/CAXException.h
/* |
<codex> |
<abstract>Part of CoreAudio Utility Classes</abstract> |
<\codex> |
*/ |
#ifndef __CAXException_h__ |
#define __CAXException_h__ |
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__) |
#include <CoreFoundation/CoreFoundation.h> |
#else |
#include <ConditionalMacros.h> |
#include <CoreFoundation.h> |
#endif |
#include "CADebugMacros.h" |
#include <ctype.h> |
//#include <stdio.h> |
#include <string.h> |
class CAX4CCString { |
public: |
CAX4CCString(OSStatus error) { |
// see if it appears to be a 4-char-code |
char *str = mStr; |
*(UInt32 *)(str + 1) = CFSwapInt32HostToBig(error); |
if (isprint(str[1]) && isprint(str[2]) && isprint(str[3]) && isprint(str[4])) { |
str[0] = str[5] = '\''; |
str[6] = '\0'; |
} else if (error > -200000 && error < 200000) |
// no, format it as an integer |
sprintf(str, "%d", (int)error); |
else |
sprintf(str, "0x%x", (int)error); |
} |
const char *get() const { return mStr; } |
operator const char *() const { return mStr; } |
private: |
char mStr[16]; |
}; |
// An extended exception class that includes the name of the failed operation |
class CAXException { |
public: |
CAXException(const char *operation, OSStatus err) : |
mError(err) |
{ |
if (operation == NULL) |
mOperation[0] = '\0'; |
else if (strlen(operation) >= sizeof(mOperation)) { |
memcpy(mOperation, operation, sizeof(mOperation) - 1); |
mOperation[sizeof(mOperation) - 1] = '\0'; |
} else |
strlcpy(mOperation, operation, sizeof(mOperation)); |
} |
char *FormatError(char *str) const |
{ |
return FormatError(str, mError); |
} |
char mOperation[256]; |
const OSStatus mError; |
// ------------------------------------------------- |
typedef void (*WarningHandler)(const char *msg, OSStatus err); |
static char *FormatError(char *str, OSStatus error) |
{ |
strcpy(str, CAX4CCString(error)); |
return str; |
} |
static void Warning(const char *s, OSStatus error) |
{ |
if (sWarningHandler) |
(*sWarningHandler)(s, error); |
} |
static void SetWarningHandler(WarningHandler f) { sWarningHandler = f; } |
private: |
static WarningHandler sWarningHandler; |
}; |
#if DEBUG || CoreAudio_Debug |
#define XThrowIfError(error, operation) \ |
do { \ |
OSStatus __err = error; \ |
if (__err) { \ |
DebugMessageN2("about to throw %s: %s", CAX4CCString(__err).get(), operation);\ |
__THROW_STOP; \ |
throw CAXException(operation, __err); \ |
} \ |
} while (0) |
#define XThrowIf(condition, error, operation) \ |
do { \ |
if (condition) { \ |
OSStatus __err = error; \ |
DebugMessageN2("about to throw %s: %s", CAX4CCString(__err).get(), operation);\ |
__THROW_STOP; \ |
throw CAXException(operation, __err); \ |
} \ |
} while (0) |
#define XRequireNoError(error, label) \ |
do { \ |
OSStatus __err = error; \ |
if (__err) { \ |
DebugMessageN2("about to throw %s: %s", CAX4CCString(__err).get(), #error);\ |
STOP; \ |
goto label; \ |
} \ |
} while (0) |
#define XAssert(assertion) \ |
do { \ |
if (!(assertion)) { \ |
DebugMessageN3("[%s, %d] error: failed assertion: %s", __FILE__, __LINE__, #assertion); \ |
__ASSERT_STOP; \ |
} \ |
} while (0) |
#define XAssertNoError(error) \ |
do { \ |
OSStatus __err = error; \ |
if (__err) { \ |
DebugMessageN2("error %s: %s", CAX4CCString(__err).get(), #error);\ |
STOP; \ |
} \ |
} while (0) |
#define ca_require_noerr(errorCode, exceptionLabel) \ |
do \ |
{ \ |
int evalOnceErrorCode = (errorCode); \ |
if ( __builtin_expect(0 != evalOnceErrorCode, 0) ) \ |
{ \ |
DebugMessageN5("ca_require_noerr: [%s, %d] (goto %s;) %s:%d", \ |
#errorCode, evalOnceErrorCode, \ |
#exceptionLabel, \ |
__FILE__, \ |
__LINE__); \ |
goto exceptionLabel; \ |
} \ |
} while ( 0 ) |
#define ca_verify_noerr(errorCode) \ |
do \ |
{ \ |
int evalOnceErrorCode = (errorCode); \ |
if ( __builtin_expect(0 != evalOnceErrorCode, 0) ) \ |
{ \ |
DebugMessageN4("ca_verify_noerr: [%s, %d] %s:%d", \ |
#errorCode, evalOnceErrorCode, \ |
__FILE__, \ |
__LINE__); \ |
} \ |
} while ( 0 ) |
#define ca_debug_string(message) \ |
do \ |
{ \ |
DebugMessageN3("ca_debug_string: %s %s:%d", \ |
message, \ |
__FILE__, \ |
__LINE__); \ |
} while ( 0 ) |
#define ca_verify(assertion) \ |
do \ |
{ \ |
if ( __builtin_expect(!(assertion), 0) ) \ |
{ \ |
DebugMessageN3("ca_verify: %s %s:%d", \ |
#assertion, \ |
__FILE__, \ |
__LINE__); \ |
} \ |
} while ( 0 ) |
#define ca_require(assertion, exceptionLabel) \ |
do \ |
{ \ |
if ( __builtin_expect(!(assertion), 0) ) \ |
{ \ |
DebugMessageN4("ca_require: %s %s %s:%d", \ |
#assertion, \ |
#exceptionLabel, \ |
__FILE__, \ |
__LINE__); \ |
goto exceptionLabel; \ |
} \ |
} while ( 0 ) |
#define ca_check(assertion) \ |
do \ |
{ \ |
if ( __builtin_expect(!(assertion), 0) ) \ |
{ \ |
DebugMessageN3("ca_check: %s %s:%d", \ |
#assertion, \ |
__FILE__, \ |
__LINE__); \ |
} \ |
} while ( 0 ) |
#else |
#define XThrowIfError(error, operation) \ |
do { \ |
OSStatus __err = error; \ |
if (__err) { \ |
throw CAXException(operation, __err); \ |
} \ |
} while (0) |
#define XThrowIf(condition, error, operation) \ |
do { \ |
if (condition) { \ |
OSStatus __err = error; \ |
throw CAXException(operation, __err); \ |
} \ |
} while (0) |
#define XRequireNoError(error, label) \ |
do { \ |
OSStatus __err = error; \ |
if (__err) { \ |
goto label; \ |
} \ |
} while (0) |
#define XAssert(assertion) \ |
do { \ |
if (!(assertion)) { \ |
} \ |
} while (0) |
#define XAssertNoError(error) \ |
do { \ |
/*OSStatus __err =*/ error; \ |
} while (0) |
#define ca_require_noerr(errorCode, exceptionLabel) \ |
do \ |
{ \ |
if ( __builtin_expect(0 != (errorCode), 0) ) \ |
{ \ |
goto exceptionLabel; \ |
} \ |
} while ( 0 ) |
#define ca_verify_noerr(errorCode) \ |
do \ |
{ \ |
if ( 0 != (errorCode) ) \ |
{ \ |
} \ |
} while ( 0 ) |
#define ca_debug_string(message) |
#define ca_verify(assertion) \ |
do \ |
{ \ |
if ( !(assertion) ) \ |
{ \ |
} \ |
} while ( 0 ) |
#define ca_require(assertion, exceptionLabel) \ |
do \ |
{ \ |
if ( __builtin_expect(!(assertion), 0) ) \ |
{ \ |
goto exceptionLabel; \ |
} \ |
} while ( 0 ) |
#define ca_check(assertion) \ |
do \ |
{ \ |
if ( !(assertion) ) \ |
{ \ |
} \ |
} while ( 0 ) |
#endif |
#define XThrow(error, operation) XThrowIf(true, error, operation) |
#define XThrowIfErr(error) XThrowIfError(error, #error) |
#endif // __CAXException_h__ |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-10-08