cJSON内存泄漏 [英] cJSON memory leak

问题描述

我用cJSON在我的计划，以我的价值观转换成JSON并将其写入到文件。这里是我的code的例子：

I use cJSON in my program to convert my values to JSON and write it to file. Here is the example of my code:

void writeStructToFile(IOPipe this, struct structtype somevalues) {
    cJSON *jout = cJSON_CreateObject();
    cJSON_AddItemToObject(jout, "V1", cJSON_CreateNumber(somevalues.v1));
    cJSON_AddItemToObject(jout, "V2", cJSON_CreateNumber(somevalues.v2));
    fprintf(this->outstream, "%s", cJSON_Print(jout));
    cJSON_Delete(jout);
}

伟大的作品，但一段时间后我发现，Linux操作系统（嵌入式）杀死，因为异常内存使用或设备（在Cortex A8的），我的程序只是挂起。调试后，我发现，这正是泄漏出现在此功能，即使我在最后删除指针。任何人都可以看到泄漏？

Works great, but after some time I found that Linux(embedded) kills my program because of abnormal memory use or device(on Cortex A8) just hangs. After debug I found, that leak appears exactly in this function even though I delete the pointer at the end. Could anyone see that leak?

推荐答案

起初我以为这可能是文件 I / O的内部缓冲区。但是，当他们变得过于庞大，这些都是会自动刷新。

Initially I thought that it might be FILE I/O's internal buffers. But these are flushed automatically when they become too big.

真正的泄漏是 cJSON_Print 分配内存：一个字符阵列。大功告成后，您必须释放这样的：

The real leak is that cJSON_Print allocates memory: a char array. You must free this after you're done:

char* text = cJSON_Print(jout);
fprintf(this->outstream, "%s", text);
free(text);  // As suggested by PaulPonomarev.

cJSON_Delete(jout);

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