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我有一个使用一些 Qt 类的控制台程序。以下代码是它的片段

std::cout << "before the problem (PVM constructor)" << std::endl;
image = new QImage(filename);
std::cout << "after the problem (PVM constructor)" << std::endl;

针对 valgrind 运行它会引发一些错误：

before the problem (PVM constructor)
==8344== Conditional jump or move depends on uninitialised value(s)
==8344==    at 0x51D6D19: inflateReset2 (in /lib/i386-linux-gnu/libz.so.1.2.3.4)
==8344==    by 0x51D6E0C: inflateInit2_ (in /lib/i386-linux-gnu/libz.so.1.2.3.4)
==8344==    by 0x51D6E92: inflateInit_ (in /lib/i386-linux-gnu/libz.so.1.2.3.4)
==8344==    by 0x51B3F60: png_create_read_struct_2 (in /lib/i386-linux-gnu/libpng12.so.0.46.0)
==8344==    by 0x42807AC: QImageReader::read(QImage*) (in /usr/lib/i386-linux-gnu/libQtGui.so.4.7.4)
==8344==    by 0x4021BAF: ???
==8344==  Uninitialised value was created by a heap allocation
==8344==    at 0x4028876: malloc (vg_replace_malloc.c:236)
==8344==    by 0x51C0796: png_malloc_default (in /lib/i386-linux-gnu/libpng12.so.0.46.0)
==8344==    by 0x51C082C: png_malloc (in /lib/i386-linux-gnu/libpng12.so.0.46.0)
==8344==    by 0x51A6A48: ??? (in /lib/i386-linux-gnu/libpng12.so.0.46.0)
==8344==    by 0x51D6DE8: inflateInit2_ (in /lib/i386-linux-gnu/libz.so.1.2.3.4)
==8344==    by 0x51D6E92: inflateInit_ (in /lib/i386-linux-gnu/libz.so.1.2.3.4)
==8344==    by 0x51B3F60: png_create_read_struct_2 (in /lib/i386-linux-gnu/libpng12.so.0.46.0)
==8344==    by 0x42807AC: QImageReader::read(QImage*) (in /usr/lib/i386-linux-gnu/libQtGui.so.4.7.4)
==8344==    by 0x4021BAF: ???
==8344== 
after the problem (PVM constructor)

你能帮我找出问题的原因吗？可能是内部 Qt 库有一些危险的结构 - 还是在控制台程序中使用 Qt GUI 库的问题（不这么认为，但谁知道）？

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1 回答 1

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Valgrind 会告诉你它是否发现内存泄漏，例如当你在堆上分配内存但你从未释放它时。我猜你只是delete image在你的程序完成后不打电话。这是 valgrind 将作为内存泄漏处理的东西。它与Qt无关。C++ 中的规则是：对于每个新的有 1 个删除。

于 2013-01-28T21:30:25.517 回答