接上一篇，记下如何用Symbian自带的GZip工具压缩其它文件及解压缩：
用到的类：CEZFileToGZip、CEZGZipToFile。
用法很简单-_-
|
//压缩
void CompressFileL(const TDesC& aSrcFile)
{
RFs& nFs = CCoeEnv::Static()->FsSession();
TBuf<256> nDestFile;
nDestFile.Zero();
nDestFile.Append(aSrcFile);
nDestFile.Append(_L(".gz"));
RFile nInput;
CleanupClosePushL(nInput);
TInt nRet = nInput.Open(nFs,aSrcFile,EFileRead|EFileStream);
if (nRet == KErrNone)
{
CEZFileToGZip* nFileToGz = CEZFileToGZip::NewLC(nFs,nDestFile,nInput);
while ( nFileToGz->DeflateL() )
{
;
}
CleanupStack::PopAndDestroy();
}
CleanupStack::PopAndDestroy();
}
|
|
| |
|
//解压缩
void CNewTestAppView::DeCompressFileL(const TDesC& aSrcFile)
{
RFs& nFs = CCoeEnv::Static()->FsSession();
TBuf<256> nDestFile;
nDestFile.Zero();
nDestFile.Append(aSrcFile);
nDestFile.Append(_L(".gz")); //简单地加了后缀"gz", 偷点懒......
RFile nOutput;
CleanupClosePushL(nOutput);
TInt nRet = nOutput.Replace(nFs,nDestFile,EFileWrite|EFileShareAny);
if (nRet == KErrNone)
{
CEZGZipToFile* nGzToFile = CEZGZipToFile::NewLC(nFs,aSrcFile,nOutput);
while ( nGzToFile->InflateL() )
{
;
}
CleanupStack::PopAndDestroy();
}
CleanupStack::PopAndDestroy();
}
|
|
另外，值得注意的是用"
CEZFileToGZip"压缩的文件也可以用"
CEZDecompressor"来解压缩，关键要在解压前去掉相应的头信息（通过UltraEdit编辑器对"
CEZFileToGZip"和"
CEZCompressor"压缩同一个文件后生成的文件的比较，可以看出头信息即为文件的前
10个字节）。
|
void DeCompressDataL(const TDesC& aFileName)
{
TInt nBufferSize = 128;
HBufC8* nSrc = ReadFile(aFileName);
if (aFileName.Right(3).CompareF(_L(".gz")) == 0) //如果是"CEZFileToGZip" 压缩的文件
{
HBufC8* nTemp = nSrc->Mid(10).Alloc();
delete nSrc;
nSrc = nTemp;
}
CleanupStack::PushL(nSrc);
CBufFlat* nBufFlat = CBufFlat::NewL(nBufferSize);
CleanupStack::PushL(nBufFlat);
CBufferManager* nBufferManager = CBufferManager::NewLC(*nSrc,*nBufFlat,nBufferSize);
CEZDecompressor* decompressor = CEZDecompressor::NewLC(*nBufferManager);
while (decompressor->InflateL())
{// loop here until the file is compressed
}
HBufC *decompressedFile = HBufC::NewL(aFileName.Length()+2);
decompressedFile->Des().Format(KDecompressedFileName,&aFileName);
WriteFile(nBufFlat->Ptr(0),*decompressedFile); //将解压后的内容写文件
delete decompressedFile;
CleanupStack::PopAndDestroy(4);
}
|
|
| |
| |
