WriteProcessMemory.md

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Function name : WriteProcessMemory

Group: Debugging - Library: kernel32

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Writes data to an area of memory in a specified process.

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Code examples:

Obtaining names and positions for shortcuts located on the Windows Desktop
Moving shortcut to a specified position on the Windows Desktop

Declaration:

BOOL WINAPI WriteProcessMemory(
  __in   HANDLE hProcess,
  __in   LPVOID lpBaseAddress,
  __in   LPCVOID lpBuffer,
  __in   SIZE_T nSize,
  __out  SIZE_T *lpNumberOfBytesWritten
);  

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FoxPro declaration:

DECLARE INTEGER WriteProcessMemory IN kernel32;
	INTEGER hProcess,;
	INTEGER lpBaseAddress,;
	INTEGER lpBuffer,;
	LONG nSize,;
	LONG @ lpNumberOfBytesWritten
  

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Parameters:

hProcess [in] A handle to the process memory to be modified. The handle must have PROCESS_VM_WRITE and PROCESS_VM_OPERATION access to the process.

lpBaseAddress [in] A pointer to the base address in the specified process to which data is written.

lpBuffer [in] A pointer to the buffer that contains data to be written in the address space of the specified process.

nSize [in] The number of bytes to be written to the specified process.

lpNumberOfBytesWritten [out] A pointer to a variable that receives the number of bytes transferred into the specified process.

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Return value:

If the function succeeds, the return value is nonzero.

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Comments:

The entire area to be written to must be accessible or the operation fails.

See also: ReadProcessMemory, VirtualAllocEx.

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