UE4 内存管理测试 FMemory

最新推荐文章于 2023-03-19 23:46:47 发布

原创最新推荐文章于 2023-03-19 23:46:47 发布 · 3.1k 阅读

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#内存管理

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本文详细展示了在Unreal Engine 4中进行内存分配、初始化、复制、移动及释放的过程，同时深入探讨了字符串的长度计算、字符集转换及拼接技巧。通过具体实例，揭示了不同操作对内存布局的影响。

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uint8*pdata = (uint8*)FMemory::Malloc(1024);
   FMemory::Memzero(pdata, 1024);
   uint32 size = (uint32)FMemory::GetAllocSize(pdata);
   UE_LOG(LogTemp, Warning, TEXT("内存大小{%d}！"), size);
   //LogTemp: Warning: 内存大小{1024}！
   UE_LOG(LogTemp, Warning, TEXT("字符串长度{%d}！"), FCStringAnsi::Strlen((ANSICHAR*)pdata));
   //LogTemp: Warning: 字符检测大小{0}！
   FString fs = TEXT("1234567890中国");
   FString fn = TEXT("abcdefg人");
   TCHAR*tt = fs.GetCharArray().GetData();
   uint8*ptmp = (uint8*)TCHAR_TO_UTF8(tt);
   int32 fslen = FCStringAnsi::Strlen((ANSICHAR*)ptmp);
   UE_LOG(LogTemp, Warning, TEXT("fs len{%d},{%d}"), fslen, FCString::Strlen(tt));
   //LogTemp: Warning: fs len{16},{12}
   FMemory::Memcpy(pdata, ptmp, fslen);
   UE_LOG(LogTemp, Warning, TEXT("copy 1 %s"), UTF8_TO_TCHAR(ptmp));
   //LogTemp: Warning: copy 1 1234567890中国
   UE_LOG(LogTemp, Warning, TEXT("字符串长度{%d}！"), FCStringAnsi::Strlen((ANSICHAR*)pdata));
   //LogTemp: Warning: 字符串长度{16}！
   tt = fn.GetCharArray().GetData();
   ptmp = (uint8*)TCHAR_TO_UTF8(tt);
   int32 fnlen = FCStringAnsi::Strlen((ANSICHAR*)ptmp);
   FMemory::Memcpy(pdata + fslen, ptmp, fnlen);
   UE_LOG(LogTemp, Warning, TEXT("copy 2 %s"), UTF8_TO_TCHAR(pdata));
   //LogTemp: Warning: copy 2 1234567890中国abcdefg人
   UE_LOG(LogTemp, Warning, TEXT("字符串长度{%d}！"), FCStringAnsi::Strlen((ANSICHAR*)pdata));
   //======================================================================
   FMemory::Memmove(pdata, pdata + 10, 8);
   UE_LOG(LogTemp, Warning, TEXT("copy 3 %s"), UTF8_TO_TCHAR(pdata));
   //LogTemp: Warning: copy 3 中国ab90中国abcdefg人
   FMemory::Memzero(pdata + 8, 18);
   UE_LOG(LogTemp, Warning, TEXT("copy 3 %s"), UTF8_TO_TCHAR(pdata));
   //LogTemp: Warning: copy 3 中国ab
   UE_LOG(LogTemp, Warning, TEXT("字符串3长度{%d}！"), FCStringAnsi::Strlen((ANSICHAR*)pdata));
   //LogTemp: Warning: 字符串3长度{8}！
   FMemory::Memmove(pdata, pdata + 3, 5);
   UE_LOG(LogTemp, Warning, TEXT("copy 4 %s"), UTF8_TO_TCHAR(pdata));
   //LogTemp: Warning: copy 4 国ab?ab
   UE_LOG(LogTemp, Warning, TEXT("字符串4长度{%d}！"), FCStringAnsi::Strlen((ANSICHAR*)pdata));
   //LogTemp: Warning: 字符串4长度{6}！
   FMemory::Memzero(pdata + 5, 3);
   UE_LOG(LogTemp, Warning, TEXT("copy 4 %s"), UTF8_TO_TCHAR(pdata));
   //LogTemp: Warning: copy 4 国ab
   UE_LOG(LogTemp, Warning, TEXT("字符串4长度{%d}！"), FCStringAnsi::Strlen((ANSICHAR*)pdata));
   //   //LogTemp: Warning: 字符串4长度{5}！
   FMemory::Free(pdata);