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Dec 27th, 2005

CreateThread & CreateRemoteThread

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Hi, can someone point me to a good tutorial on using the CreateThread and CreateRemoteThread API?

I've already read the MSDN documentation for both functions, i'm looking for a site that explains the use of both functions in more detail and provides alot of example code, thanks.

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osean

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Dec 27th, 2005

Re: CreateThread & CreateRemoteThread

I don't know about CreateRemoteThread -- never used it.

you probably won't find any "tutorials" because there isn't that much to it. Most of the parameters are 0, unless you want more control over the thread.

First create the thread itself -- name it anything you want. If it is a member of c++ class it must be static method.

C++ Syntax (Toggle Plain Text)
DWORD WINAPI ThreadProc( LPVOID lpParameter)
{
  // blabla
 
  return 0;
}
DWORD WINAPI ThreadProc( LPVOID lpParameter)
{
  // blabla

  return 0;
}

now create an instance of the thread in your program

C++ Syntax (Toggle Plain Text)
DWORD dwThreadID;
HANDLE hThread = CreateThread(0,0,ThreadProc,0,0,&dwThreadID);
DWORD dwThreadID;
HANDLE hThread = CreateThread(0,0,ThreadProc,0,0,&dwThreadID);

The parameter immediately following ThreadProc is a parameter you want to pass to the thread. So if you want to pass the this pointer (assuming c++ program)

C++ Syntax (Toggle Plain Text)
DWORD dwThreadID;
HANDLE hThread = CreateThread(0,0,ThreadProc,this,0,&dwThreadID);
DWORD dwThreadID;
HANDLE hThread = CreateThread(0,0,ThreadProc,this,0,&dwThreadID);

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Dec 28th, 2005

Re: CreateThread & CreateRemoteThread

Thanks for your reply,
the main reason why I posted was because i'm specifically having problems with what you mentioned in the last part of your post, passing a paramater to the thread (I thought if people could point me to a site with some examples I could see real examples of it in use and figure it out myself).

Basically, I have an array type structure and I need to pass the object (i think?) associated with it to the thread, like the example code below:

C++ Syntax (Toggle Plain Text)
struct Blah {
    char test[512];
    char testnext[512];
} TestStruct[5];
 
DWORD WINAPI testproc(LPVOID param) {
  //how would i grab the paramater here?
}
 
int main(void) {
   memset(TestStruct[0].test,0,sizeof(TestStruct[0].test));
   strncpy(TestStruct[0].test,"blah..",sizeof(TestStruct[0].test)-1);
   DWORD id;
   HANDLE ThreadHandle;
   //i know this is definately wrong, i just added it so you can see what i'm trying to pass to the thread function
   ThreadHandle = CreateThread(0, 0, &testproc, (LPVOID)&TestStruct[0], 0, &id);
   return 0;
}
struct Blah {
    char test[512];
    char testnext[512];
} TestStruct[5];

DWORD WINAPI testproc(LPVOID param) {
  //how would i grab the paramater here?
}

int main(void) {
   memset(TestStruct[0].test,0,sizeof(TestStruct[0].test));
   strncpy(TestStruct[0].test,"blah..",sizeof(TestStruct[0].test)-1);
   DWORD id;
   HANDLE ThreadHandle;
   //i know this is definately wrong, i just added it so you can see what i'm trying to pass to the thread function
   ThreadHandle = CreateThread(0, 0, &testproc, (LPVOID)&TestStruct[0], 0, &id);
   return 0;
}

I've seen examples of this being done but not with an array type structure so i'm stuck.

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Dec 28th, 2005

Re: CreateThread & CreateRemoteThread

nevermind.. i figured it out, thanks anyway.

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