glGetShaderInfoLog 3G
glGetShaderInfoLog return the information log for a shader object

## C Specification

void `glGetShaderInfoLog` GLuint shader GLsizei maxLength GLsizei *length GLchar *infoLog

## Parameters

shader

  Specifies the shader object whose information log is to be queried.

maxLength

  Specifies the size of the character buffer for storing the returned information log.

length

  Returns the length of the string returned in infoLog (excluding the null terminator).

infoLog

  Specifies an array of characters that is used to return the information log.

## Description

`glGetShaderInfoLog` returns the information log for the specified shader object. The information log for a shader object is modified when the shader is compiled. The string that is returned will be null terminated.

`glGetShaderInfoLog` returns in infoLog as much of the information log as it can, up to a maximum of maxLength characters. The number of characters actually returned, excluding the null termination character, is specified by length. If the length of the returned string is not required, a value of `NULL` can be passed in the length argument. The size of the buffer required to store the returned information log can be obtained by calling glGetShaderiv with the value `GL_INFO_LOG_LENGTH`.

The information log for a shader object is a string that may contain diagnostic messages, warning messages, and other information about the last compile operation. When a shader object is created, its information log will be a string of length 0.

## Notes

The information log for a shader object is the OpenGL implementer's primary mechanism for conveying information about the compilation process. Therefore, the information log can be helpful to application developers during the development process, even when compilation is successful. Application developers should not expect different OpenGL implementations to produce identical information logs.

## Errors

`GL_INVALID_VALUE` is generated if shader is not a value generated by OpenGL.

`GL_INVALID_OPERATION` is generated if shader is not a shader object.

`GL_INVALID_VALUE` is generated if maxLength is less than 0.

## Associated Gets

glGetShaderiv with argument `GL_INFO_LOG_LENGTH`

glIsShader

## See Also

glCompileShader, glGetProgramInfoLog, glLinkProgram, glValidateProgram

## Copyright

Copyright 2003-2005 3Dlabs Inc. Ltd. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.