string to LPCVOID

can we do "string to LPCVOID" ??

Assuming std::string, then it's just "str.c_str()".

Some information on the context in which this is being done would be helpful - including the actual type of "string".

gg

thanks for reply but I tried this I get error :S

What error?
Are you using unicode?

string -> C++ -> no automatic conversion to/from void *, so perhaps all you need is:

Code:

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reinterpret_cast<void *>(str.c_str())

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If that doesn't work, we need to see the code, and the error message, because we can guess what is wrong for quite a while before getting it right.

--
Mats

No... any type can be implicitly converted to void*, but it cannot be implicitly converted from void*.

this is my code

Code:

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    if(!WriteProcessMemory(hProcess, str, lpszDllPath.c_str(), lpszDllPath.length() + 1, 0))

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and this is my error

Code:

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error C2664: 'WriteProcessMemory' : cannot convert parameter 3 from 'const char *' to 'void *'

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and "lpszDllPath" is string.. thanks for reply and sory my english..

In this case, it is safe to convert to void*.
It doesn't work because c_str() returns const char*, and the function takes void* (thus you disregard the const specifier).
Try:

Code:

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    if(!WriteProcessMemory(hProcess, str, const_cast<char*>( lpszDllPath.c_str() ), lpszDllPath.length() + 1, 0))

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I tried it but I got another error.. It is

Code:

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error C2440: 'reinterpret_cast' : cannot convert from 'const char *' to 'void *'

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I checked out the situation and edited the post. It should work.

Quote:

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Originally Posted by Elysia

Code:

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    if(!WriteProcessMemory(hProcess, str, const_cast<char*>( lpszDllPath.c_str() ), lpszDllPath.length() + 1, 0))

---

---

try:

Code:

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if(!WriteProcessMemory(hProcess, str, (void*)( lpszDllPath.c_str() ), lpszDllPath.length() + 1, 0))

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the function expects void*, not const char *

Irrelevant. Char* can be implicitly converted to void*.
However, const char* cannot be implicitly converted to void* because it's const. Const void* works.

Therefore, we must cast away the const, so const char* -> char* -> void*.
It works. I tried it.
But if you want to do it the C-way, be my guest.

Quote:

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Originally Posted by koyboy

error C2664: 'WriteProcessMemory' : cannot convert parameter 3 from 'const char *' to 'void *'

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Quote:

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Originally Posted by MSDN

Code:

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

---

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You should update your Platform SDK. See this thread for links: http://cboard.cprogramming.com/showthread.php?t=79619
In the meantime, open up your <winbase.h> and change the 3rd parameter type to LPCVOID.

gg