ReadProcessMemory

This function reads memory in a specified process. The entire area to be read must be accessible, or the operation fails.

BOOL ReadProcessMemory( 
HANDLE hProcess, 
LPCVOID lpBaseAddress, 
LPVOID lpBuffer, 
DWORD nSize, 
LPDWORD lpNumberOfBytesRead );

Parameters

• hProcess
  Handle to the process whose memory is being read. In Windows CE, any call to OpenProcess will return a process handle with the proper access rights.
• lpBaseAddress
  Pointer to the base address in the specified process to be read. Before any data transfer occurs, the system verifies that all data in the base address and memory of the specified size is accessible for read access. If this is the case, the function proceeds; otherwise, the function fails.
• lpBuffer
  Pointer to a buffer that receives the contents from the address space of the specified process.
• nSize
  Specifies the requested number of bytes to read from the specified process.
• lpNumberOfBytesRead
  Pointer to the actual number of bytes transferred into the specified buffer. If lpNumberOfBytesRead is NULL, the parameter is ignored.

Return Values

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

The function fails if the requested read operation crosses into an area of the process that is inaccessible.

Remarks

ReadProcessMemory copies the data in the specified address range from the address space of the specified process into the specified buffer of the current process. The process whose address space is read is typically, but not necessarily, being debugged.

The entire area to be read must be accessible. If it is not, the function fails as noted previously.

Requirements

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

OpenProcess, GetLastError, WriteProcessMemory

 Last updated on Tuesday, July 13, 2004

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