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<pre class="sourcecodebox">/*
dru_burning.c
Part of the Disc Recording Utility sources for command-line tools. This
code provides an example of handling progress during a burn.
*/
#include <DiscRecording/DiscRecording.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/ttycom.h>
#include "dru_burning.h"
#include "dru_progress.h"
typedef struct druBurnStatus druBurnStatus;
struct druBurnStatus
{
int success;
CFStringRef lastState;
CFNumberRef lastTrack;
CFDictionaryRef completionStatus;
char stage[80];
dru_progress_t progressBar;
};
void druProgressCallback(DRNotificationCenterRef center,void *observer,CFStringRef name,DRTypeRef object,CFDictionaryRef info);
#pragma mark -
/*
druBurn
Called to do a burn. Burning is a long async process, so this function mostly
handles providing appropriate progress and completion information to the user.
*/
int
druBurn(DRBurnRef burn, CFTypeRef layout)
{
DRNotificationCenterRef notificationCenter = NULL;
CFRunLoopSourceRef source = NULL;
druBurnStatus status = {0, NULL, NULL, NULL, {0}, 0};
/* Create a progress bar. */
status.progressBar = druProgressBarCreate();
/* Sign up for notifications from the burn object. */
notificationCenter = DRNotificationCenterCreate();
source = DRNotificationCenterCreateRunLoopSource(notificationCenter);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);
DRNotificationCenterAddObserver(notificationCenter,&status,druProgressCallback, kDRBurnStatusChangedNotification, burn);
/* Okay, kick off the burn. */
DRBurnWriteLayout(burn, layout);
/* Enter a runloop until the burn finishes. */
CFRunLoopRun();
/* Clean up memory and exit. */
CFRunLoopSourceInvalidate(source);
if (notificationCenter != NULL) CFRelease(notificationCenter);
if (source != NULL) CFRelease(source);
if (status.progressBar != NULL) druProgressBarDispose(status.progressBar,status.success);
if (status.success)
printf("Burn completed.\n");
else
druPrintFailureMessage("Burn", status.completionStatus);
if (status.completionStatus != NULL) CFRelease(status.completionStatus);
return status.success;
}
/*
druErase
Called to do a erase. Pass in the device and a flag to indicate a full or quick erase.
*/
int
druErase(DRDeviceRef device, int fullErase)
{
DREraseRef erase = NULL;
DRNotificationCenterRef notificationCenter = NULL;
CFRunLoopSourceRef source = NULL;
druBurnStatus status = {0, NULL, NULL, NULL, {0}, 0};
CFMutableDictionaryRef properties;
erase = DREraseCreate(device);
if (erase != NULL)
{
/* Create a progress bar. */
status.progressBar = druProgressBarCreate();
/* Sign up for notifications from the erase object. */
notificationCenter = DRNotificationCenterCreate();
source = DRNotificationCenterCreateRunLoopSource(notificationCenter);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);
DRNotificationCenterAddObserver(notificationCenter,&status,druProgressCallback,kDREraseStatusChangedNotification, erase);
/* setup erase properties for type of erase to be performed */
properties = CFDictionaryCreateMutable(NULL,0,&kCFTypeDictionaryKeyCallBacks,&kCFTypeDictionaryValueCallBacks);
if (fullErase)
CFDictionaryAddValue(properties,kDREraseTypeKey,kDREraseTypeComplete);
else
CFDictionaryAddValue(properties,kDREraseTypeKey,kDREraseTypeQuick);
DREraseSetProperties(erase, properties);
/* Okay, start the erase. */
DREraseStart(erase);
/* Enter a runloop until the burn finishes. */
CFRunLoopRun();
/* Clean up memory and exit. */
CFRunLoopSourceInvalidate(source);
if (notificationCenter != NULL) CFRelease(notificationCenter);
if (source != NULL) CFRelease(source);
if (status.progressBar != NULL) druProgressBarDispose(status.progressBar,status.success);
CFRelease(erase);
}
if (status.success)
printf("Erase completed.\n");
else
druPrintFailureMessage("Erase", status.completionStatus);
if (status.completionStatus != NULL) CFRelease(status.completionStatus);
return status.success;
}
#pragma mark -
/*
druProgressCallback
DRNotificationCallback to handle burn or erase progress.
*/
void
druProgressCallback(DRNotificationCenterRef center,void *observer,CFStringRef name,DRTypeRef object,CFDictionaryRef taskStatus)
{
#pragma unused(center, name, object)
druBurnStatus *status = (druBurnStatus*)observer;
CFStringRef currentState = NULL;
CFNumberRef progressRef = NULL;
CFNumberRef currentTrackRef = NULL;
float progress = 0.0;
int currentTrack = 0;
char buffer[sizeof(status->stage)];
/* Get information from the status dictionary. */
currentState = CFDictionaryGetValue(taskStatus,kDRStatusStateKey);
progressRef = CFDictionaryGetValue(taskStatus,kDRStatusPercentCompleteKey);
currentTrackRef = CFDictionaryGetValue(taskStatus,kDRStatusCurrentTrackKey);
/* Fetch values from CFNumbers. */
if (progressRef != NULL)
CFNumberGetValue(progressRef,kCFNumberFloatType,&progress);
if (currentTrackRef != NULL)
CFNumberGetValue(currentTrackRef,kCFNumberIntType,&currentTrack);
/* Check to see if primary burn state has changed. (Preparing, Writing, Verifying, etc) */
if (status->lastState == NULL ||
!CFEqual(status->lastState,currentState) ||
((currentTrackRef != NULL) && !CFEqual(status->lastTrack,currentTrackRef)))
{
/* Yes - did we have a previous state? */
if (status->lastState != NULL)
{
/* Forget about the old state. */
if (status->lastState) CFRelease(status->lastState);
if (status->lastTrack) CFRelease(status->lastTrack);
}
/* If the burn was successful, stop the runloop. */
if (CFEqual(currentState,kDRStatusStateDone))
{
status->completionStatus = (CFDictionaryRef)CFRetain(taskStatus);
status->success = 1;
CFRunLoopStop(CFRunLoopGetCurrent());
return;
}
/* If the burn was unsuccessful, print a failure message (localized)
and stop the runloop. */
if (CFEqual(currentState,kDRStatusStateFailed))
{
status->completionStatus = (CFDictionaryRef)CFRetain(taskStatus);
status->success = 0;
CFRunLoopStop(CFRunLoopGetCurrent());
return;
}
/* Remember the new state. */
status->lastState = CFStringCreateCopy(NULL,currentState);
if (currentTrackRef) status->lastTrack = CFRetain(currentTrackRef);
/* Translate the stage into a user-visible string.
We only display a few of the possible states - the others are
brief and the user doesn't really care about them.
*/
buffer[0] = 0;
if (CFEqual(currentState,kDRStatusStatePreparing))
{
if (currentTrack == 0)
snprintf(buffer,sizeof(buffer),"Preparing...");
else
snprintf(buffer,sizeof(buffer),"Preparing track %d ...", currentTrack);
}
else if (CFEqual(currentState,kDRStatusStateTrackWrite))
{
if (currentTrack != 0)
snprintf(buffer,sizeof(buffer),"Writing track %d ...", currentTrack);
}
else if (CFEqual(currentState,kDRStatusStateSessionClose) ||
CFEqual(currentState,kDRStatusStateTrackClose))
{
snprintf(buffer,sizeof(buffer),"Closing...");
}
else if (CFEqual(currentState,kDRStatusStateVerifying))
{
if (currentTrack != 0)
snprintf(buffer,sizeof(buffer),"Verifying...");
}
else if (CFEqual(currentState,kDRStatusStateErasing))
{
snprintf(buffer,sizeof(buffer),"Erasing...");
}
/* Change the stage string - the progress bar will catch this. */
if (buffer[0] != 0 && strcmp(status->stage,buffer))
strncpy(status->stage, buffer, sizeof(status->stage));
}
/* Update the progress bar. */
druProgressBarUpdate(status->progressBar,status->stage,progress);
}
/*
druPrintFailureMessage
Prints out a localized burn failure message from the burn engine.
*/
void
druPrintFailureMessage(const char *task, CFDictionaryRef status)
{
CFDictionaryRef errorStatus = CFDictionaryGetValue(status,kDRErrorStatusKey);
UInt8 message[256];
CFIndex len = 0;
strncpy(message,"no error message available.",sizeof(message));
if (errorStatus != NULL)
{
CFStringRef errorString = CFDictionaryGetValue(errorStatus,kDRErrorStatusErrorStringKey);
if (errorString != NULL)
{
CFStringGetBytes(errorString, CFRangeMake(0,CFStringGetLength(errorString)), kCFStringEncodingASCII,
'.', false, (UInt8*)message, sizeof(message)-1, &len);
message[len] = 0;
}
}
printf("%s failed: %s\n", task, message);
}
</pre>
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