OpenGL glShaderSource throws an exception - c++

Question

This code throws nvoglv32.dll exception. I think there is an error in glShaderSource somewherer, but I can't find it
ifstream ifs("vertexShader.txt");
string vertexShadersSource((istreambuf_iterator<char>(ifs)),
(std::istreambuf_iterator<char>()));
ifs.close();
ifs.open("fragmentShader.txt");
string fragmentShadersSource((istreambuf_iterator<char>(ifs)),
(std::istreambuf_iterator<char>()));
cout << fragmentShadersSource.c_str() << endl;
cout << vertexShadersSource.c_str() << endl;
GLuint shaderProgram;
GLuint fragmentShader, vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
const char *data = vertexShadersSource.c_str();
glShaderSource(vertexShader, 1, &data, (GLint*)vertexShadersSource.size());
data = fragmentShadersSource.c_str();
glShaderSource(fragmentShader, 1, &data, (GLint*)fragmentShadersSource.size());
EDIT:
Although I think the shader is correct, here you can see the shader code
VertexShader:
#version 150
// in_Position was bound to attribute index 0 and in_Color was bound to attribute index 1
//in vec2 in_Position;
//in vec3 in_Color;
// We output the ex_Color variable to the next shader in the chain
out vec3 ex_Color;
void main(void) {
// Since we are using flat lines, our input only had two points: x and y.
// Set the Z coordinate to 0 and W coordinate to 1
//gl_Position = vec4(in_Position.x, in_Position.y, 0.0, 1.0);
// GLSL allows shorthand use of vectors too, the following is also valid:
// gl_Position = vec4(in_Position, 0.0, 1.0);
// We're simply passing the color through unmodified
ex_Color = vec3(1.0, 1.0, 0.0);
}
FragmentShader:
#version 150
// It was expressed that some drivers required this next line to function properly
precision highp float;
in vec3 ex_Color;
out vec4 gl_FragColor;
void main(void) {
// Pass through our original color with full opacity.
gl_FragColor = vec4(ex_Color,1.0);
}

Answer 1

Your call is wrong:
glShaderSource(vertexShader, 1, &data, (GLint*)vertexShadersSource.size());
and the type cast from a size_t to a pointer type should have raised some red flags while you wrote it.
glShaderSource() expects a pointer to an array of string lenghts - one element per separate string. Since you only use 1 string, it will try to access lenght[0]. This means it treats your string size as an address, and that address is very likely to not belong to your process.
Since you already use 0-terminated C-Strings, you can simply use NULL as the length parameter. Or, if you absolutely want to use it, you have to just pass a pointer to an GLint:
GLint len=vertexShadersSource.size();
glShaderSource(..., 1, ..., &len);