how to broadCast string in mpi

[ahmed eltaher]

string  Image_name;	
cout<<"enter image name"<<endl;
		cin>>Image_name;

MPI_Bcast(&image_name2, 100*sizeof(char), MPI_CHAR, MasterID, MPI_COMM_WORLD);

it doesn't broadCast string properly , can any one correct my error

[tabstop]

Is there supposed to be a relationship between Image_name and image_name2? Any reason for 100?

[ahmed eltaher]

image_name2="D:\\ImgDB\\" +Image_name;
100*sizeof(char) -------> I think it is the message size

[tabstop]

Why do you think that 100*sizeof(char) is the message size? Wouldn't it depend on the length of image_name?

Also if image_name2 is defined as a string, you are going to have to convert it to a char array in order to broadcast it.

[kmdv]

MPI_Bcast(image_name2.c_str(), image_name2.size(), MPI_CHAR, MasterID, MPI_COMM_WORLD);

or

MPI_Bcast(image_name2.c_str(), image_name2.size() + 1, MPI_CHAR, MasterID, MPI_COMM_WORLD);

if the string is supposed to be null terminated.