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我是C新手,我正在嘗試爲我正在小型測試應用程序中工作的程序制定邏輯。結構中的鏈接列表
它的目的是從將數據添加到結構的數據庫中讀取值,但在此結構中將包含與頂層結構相關的其他值的鏈接列表。我似乎在結構和鏈表中添加了很好的東西,但是當我嘗試並檢索它崩潰的值時。
下面是我的結構定義
typedef struct CallLogStructure
{
char * date;
char * time;
char * bParty;
char * aParty;
float duration;
char * cleardownCause;
struct Node *outBoundLegs;
} callLogStructure;
typedef struct Node
{
char * target;
float targetDuration;
char * targetCleardownCause;
struct Node *next;
}node;
下面是我怎麼了初始化結構,然後調用方法將數據添加到鏈表。
char *outboundTarget = "0";
float outboundDuration = 0;
char *outboundCleardown = "0";
callLogStructure * callLog = NULL;
node *temp = NULL;
int dataRow = 0;
callLog = malloc(dataRow+1 * sizeof(callLog));
//start = (node*)malloc(sizeof(node));
callLog[0].outBoundLegs = NULL;
callLog[0].outBoundLegs = (node*)malloc(sizeof(node));
if (callLog[0].outBoundLegs == NULL)
{
printf("Failed to allocate RAM\n");
}
temp = &callLog[0].outBoundLegs;
temp->next = NULL;
callLog[0].outBoundLegs->target = "0";
callLog[0].outBoundLegs->targetDuration = 0;
callLog[0].outBoundLegs->targetCleardownCause = "0";
//Insert first inbound leg
callLog[0].date = "16/05/2011";
callLog[0].time = "00:00:03";
callLog[0].aParty = "12345";
callLog[0].bParty = "67890";
callLog[0].duration = 0;
callLog[0].cleardownCause = "unanswered";
outboundTarget = "98765";
outboundDuration = 0;
outboundCleardown = "Unanswered";
insertOutBoundLeg(&callLog[0].outBoundLegs, outboundTarget, outboundDuration, outboundCleardown);
printf("NEWLY INSERTED OUTBOUND TARGET: %s", callLog[0].outBoundLegs->target); //This is where it's crashing.
下面是insertOutBoundLeg
功能
void insertOutBoundLeg(struct Node *pointer, char * target, float targetDuration, char * targetCleardownCause)
{
if (pointer->target == NULL)
{
asprintf(&pointer->target, "%s", target);
pointer->targetDuration = targetDuration;
asprintf(&pointer->targetCleardownCause, "%s", targetCleardownCause);
//pointer->target = target;
//pointer->targetDuration = targetDuration;
//pointer->targetCleardownCause = targetCleardownCause;
}
else
{
while (pointer->next != NULL)
{
pointer = pointer->next;
}
pointer->next = (node *)malloc(sizeof(node));
pointer = pointer->next;
//pointer->target = target;
//pointer->targetDuration = targetDuration;
//pointer->targetCleardownCause = targetCleardownCause;
asprintf(&pointer->target, "%s", target);
pointer->targetDuration = targetDuration;
asprintf(&pointer->targetCleardownCause, "%s", targetCleardownCause);
pointer->next = NULL;
}
}
的想法是,這是建立最終的情況下,結構,包含在結構中的鏈接列表一起將被傳遞到一個單獨的功能,這將將數據導出到一個文件中,我通過首先打印outboundlegs(鏈表)的值嘗試過,但是這也會崩潰,但是,頂層結構(callLog)中的值很好。
感謝您提供的任何幫助。
感謝您的幫助。 – Boardy