ue4-数据二进制存取
- 之前不知道ue4里面自带了那么好用的数据存取的工具，所以之前把cocos项目中的二进制存取移到ue4中 传送门。
- ue4中还可以二进制数据再压缩一下，使其变得更小（不过数据文件再怎么大也大不到那里，此举有点多余，对图片来说就不一样了）
压缩存取数据
测试代码
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138void UMyBpFuncLib::TestFileWriteCompressed(FString _path)
{
//FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
//Step 1: Variable Data -> Binary
uint8 b = 1;
int32 num = 123;
float height = 456.789;
FString dataStr = FString::Printf(TEXT("--- dataStr"));
FVector tmp(11.11, 22.22, 33.33);
TArray<FRotator> SaveDataRotatorArray;
for (int32 i = 0; i < 10; i++)
SaveDataRotatorArray.Push(FRotator(i*10, i*10, i*10));
FBufferArchive ToBinary;
ToBinary << b;
ToBinary << num;
ToBinary << height;
ToBinary << dataStr;
ToBinary << tmp; //save player location to hard disk
ToBinary << SaveDataRotatorArray;
//Save data
//FString SavePath = "C:\\mysavefileCp.save";
//No Data
if (ToBinary.Num() <= 0) return;
// Compress File
//tmp compressed data array
TArray<uint8> CompressedData;
FArchiveSaveCompressedProxy Compressor =
FArchiveSaveCompressedProxy(CompressedData, ECompressionFlags::COMPRESS_ZLIB);
//Send entire binary array/archive to compressor
Compressor << ToBinary;
//send archive serialized data to binary array
Compressor.Flush();
//test size
FString str = FString::Printf(TEXT("--- befor Compresse:%d, after Compresse:%d"), ToBinary.Num(), CompressedData.Num());
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Green, str);
////Step 2: Binary to Hard Disk - compress
//vibes to file, return successful or not
if (FFileHelper::SaveArrayToFile(CompressedData, *_path))
{
// Free Binary Arrays
Compressor.FlushCache();
CompressedData.Empty();
ToBinary.FlushCache();
ToBinary.Empty();
// Close Buffer
ToBinary.Close();
return;
}
else
{
// Free Binary Arrays
Compressor.FlushCache();
CompressedData.Empty();
ToBinary.FlushCache();
ToBinary.Empty();
// Close Buffer
ToBinary.Close();
return;
}
}
void UMyBpFuncLib::TestFileReadCompressed(FString _path)
{
//Load the Compressed data array
TArray<uint8> CompressedData;
if (!FFileHelper::LoadFileToArray(CompressedData, *_path))
{
FString str = FString::Printf(TEXT("--- FFILEHELPER:>> Invalid File"));
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Green, str);
return;
}
// Decompress File
FArchiveLoadCompressedProxy Decompressor =
FArchiveLoadCompressedProxy(CompressedData, ECompressionFlags::COMPRESS_ZLIB);
//Decompression Error?
if (Decompressor.GetError())
{
FString str = FString::Printf(TEXT("--- FArchiveLoadCompressedProxy>> ERROR : File Was Not Compressed"));
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Green, str);
return;
}
//Decompress
FBufferArchive DecompressedBinaryArray;
Decompressor << DecompressedBinaryArray;
uint8 b = 0;
int32 num = 0;
float height = 0.f;
FString dataStr(TEXT(""));
FVector location;
TArray<FRotator> rotatorArr;
//Read the Data Retrieved by GFileManager
FMemoryReader FromBinary = FMemoryReader(DecompressedBinaryArray, true); //true, free data after done
FromBinary.Seek(0);
FromBinary << b;
FromBinary << num;
FromBinary << height;
FromBinary << dataStr;
FromBinary << location;
FromBinary << rotatorArr;
CompressedData.Empty();
Decompressor.FlushCache();
FromBinary.FlushCache();
// Empty & Close Buffer
DecompressedBinaryArray.Empty();
DecompressedBinaryArray.Close();
//print
FString str2 = FString::Printf(TEXT("--- b:%d, num:%d, height:%f, dataStr:%s\n"), b, num, height, *dataStr);
FString str3 = FString::Printf(TEXT("--- location x:%f, y:%f, z:%f\n"), location.X, location.Y, location.Z);
FString str4("");
for (auto rot : rotatorArr)
{
FString tmp = FString::Printf(TEXT("--- rotator Pitch:%f, Yaw:%f, Roll:%f\n"), rot.Pitch, rot.Yaw, rot.Roll);
str4.Append(tmp);
}
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Yellow, str2 + str3 + str4);
}结果
未压缩存取数据
测试代码
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103void UMyBpFuncLib::TestFileWriteUnCompressed(FString _path)
{
//FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
//Step 1: Variable Data -> Binary
FBufferArchive ToBinary;
uint8 b = 1;
int32 num = 123;
float height = 456.789;
FString dataStr = FString::Printf(TEXT("--- dataStr"));
FVector tmp(11.11, 22.22, 33.33);
TArray<FRotator> SaveDataRotatorArray;
for (int32 i = 0; i < 10; i++)
SaveDataRotatorArray.Push(FRotator(i * 10, i * 10, i * 10));
ToBinary << b;
ToBinary << num;
ToBinary << height;
ToBinary << dataStr;
ToBinary << tmp; //save player location to hard disk
ToBinary << SaveDataRotatorArray;
//Save data
//FString SavePath = "C:\\mysavefileUnCp.save";
//No Data
if (ToBinary.Num() <= 0) return;
//Step 2: Binary to Hard Disk
if (FFileHelper::SaveArrayToFile(ToBinary, *_path))
{
// Free Binary Array
ToBinary.FlushCache();
ToBinary.Empty();
FString str = FString::Printf(TEXT("--- SaveFile Success"));
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Green, str);
return;
}
// Free Binary Array
ToBinary.FlushCache();
ToBinary.Empty();
}
void UMyBpFuncLib::TestFileReadUnCompressed(FString _path)
{
//Load the data array,
// you do not need to pre-initialize this array,
// UE4 C++ is awesome and fills it
// with whatever contents of file are,
// and however many bytes that is
TArray<uint8> TheBinaryArray;
if (!FFileHelper::LoadFileToArray(TheBinaryArray, *_path))
{
FString str = FString::Printf(TEXT("--- LoadFileToArray Fail"));
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Green, str);
return;
}
//Testing
FString str = FString::Printf(TEXT("--- Loaded File Size:%d"), TheBinaryArray.Num());
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Green, str);
//File Load Error
if (TheBinaryArray.Num() <= 0) return;
uint8 b = 0;
int32 num = 0;
float height = 0.f;
FString dataStr(TEXT(""));
FVector location;
TArray<FRotator> rotatorArr;
//Read the Data Retrieved by GFileManager
FMemoryReader FromBinary = FMemoryReader(TheBinaryArray, true); //true, free data after done
FromBinary.Seek(0);
FromBinary << b;
FromBinary << num;
FromBinary << height;
FromBinary << dataStr;
FromBinary << location;
FromBinary << rotatorArr;
//Clean up
FromBinary.FlushCache();
FromBinary.Close();
// Empty & Close Buffer
TheBinaryArray.Empty();
//print
FString str2 = FString::Printf(TEXT("--- b:%d, num:%d, height:%f, dataStr:%s\n"), b, num, height, *dataStr);
FString str3 = FString::Printf(TEXT("--- location x:%f, y:%f, z:%f\n"), location.X, location.Y, location.Z);
FString str4("");
for (auto rot : rotatorArr)
{
FString tmp = FString::Printf(TEXT("--- rotator Pitch:%f, Yaw:%f, Roll:%f\n"), rot.Pitch, rot.Yaw, rot.Roll);
str4.Append(tmp);
}
GEngine->AddOnScreenDebugMessage(0, 5.0f, FColor::Yellow, str2 + str3 + str4);
}结果
