how to broadCast string in mpi

Code:

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

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

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

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

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

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.

Code:

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

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or

Code:

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

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if the string is supposed to be null terminated.