qt使用zlib解压文件
时间: 2023-08-20 15:07:16 浏览: 51
在Qt中,可以使用QByteArray和QFile类来处理zlib压缩文件的解压缩操作。以下是一个简单的示例代码:
```cpp
#include <QByteArray>
#include <QFile>
#include <zlib.h>
bool decompressFile(const QString &sourceFile, const QString &destinationFile)
{
QFile inputFile(sourceFile);
if (!inputFile.open(QIODevice::ReadOnly))
return false;
QFile outputFile(destinationFile);
if (!outputFile.open(QIODevice::WriteOnly))
return false;
QByteArray inputBuffer = inputFile.readAll();
QByteArray outputBuffer;
outputBuffer.resize(1024);
z_stream stream;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = Z_NULL;
stream.avail_in = inputBuffer.size();
stream.next_in = (Bytef *)(inputBuffer.constData());
stream.avail_out = outputBuffer.size();
stream.next_out = (Bytef *)(outputBuffer.data());
if (inflateInit(&stream) != Z_OK)
return false;
int result = Z_OK;
while (result == Z_OK)
{
result = inflate(&stream, Z_NO_FLUSH);
switch (result)
{
case Z_STREAM_END:
break;
case Z_NEED_DICT:
result = Z_DATA_ERROR;
case Z_DATA_ERROR:
case Z_MEM_ERROR:
inflateEnd(&stream);
return false;
}
if (outputFile.write(outputBuffer, stream.total_out) == -1)
{
inflateEnd(&stream);
return false;
}
stream.avail_out = outputBuffer.size();
stream.next_out = (Bytef *)(outputBuffer.data());
}
outputFile.close();
inputFile.close();
inflateEnd(&stream);
return true;
}
```
在这个示例中,我们首先打开了需要解压的文件和解压后的目标文件。然后,我们读取整个输入文件并将其存储在QByteArray变量中。接下来,我们创建了一个z_stream结构体,并将其初始化为使用zlib库进行解压缩操作。然后,我们通过调用inflateInit()函数来初始化解压缩操作。接下来,我们使用while循环来逐步解压缩输入数据,并将解压缩后的数据写入输出文件。最后,我们调用inflateEnd()函数来释放z_stream结构体所占用的内存。