> For the complete documentation index, see [llms.txt](https://www.pinvoke.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.pinvoke.dev/kernel32/writeprocessmemory.md).

# WriteProcessMemory

```csharp
[DllImport("KERNEL32.dll", ExactSpelling = true, SetLastError = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe BOOL WriteProcessMemory(
    HANDLE hProcess,
    void* lpBaseAddress,
    void* lpBuffer,
    nuint nSize,
    [Optional] nuint* lpNumberOfBytesWritten);
```