c++ - OpenGL 着色器语言初始化错误无法从 GLChar 转换为常量

Question

我在将参数传递到我的函数 Void ShaderCode() 之一时遇到问题，更具体地说，我收到此错误:

^{Error C2440: 'initializing' : cannot convert from 'GLchar' to 'const GLchar *'
1> Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast}

有关更多信息，请参阅我的头文件:

typedef unsigned long Molong;
void CompileFunction();
GLchar ShaderCodeStorage(const char* FilePath);
void ShaderCode(const GLuint &ShaderHandler,  char* FilePath);
void CompileShader(const GLuint &ShaderHandler, const char* Response);
Molong getFileLength(std::ifstream& file);

这是我的CPP

#include "stdafx.h"
#include <Windows.h>
#include <iostream>
#include <fstream>
#include "glm/glm.hpp"
#include "glm/gtc/matrix_transform.hpp"
#include "glm/gtx/transform2.hpp"
#include "glm/gtc/type_precision.hpp"
#include "glew/glew.h"
#include <gl/GL.h>
#include <gl/GLU.h>
#include "glut.h"
#include "Storage.h"

using namespace std;

void CompileFunction()
{

    GLuint MyFirstVertShader = glCreateShader(GL_VERTEX_SHADER);

    if (0 == MyFirstVertShader)
    {
        std::cout << "There was an error making the shader" << std::endl;
        exit(1);
    }


     ShaderCode (MyFirstVertShader, "BasicVert.shader");

//  glShaderSource(MyFirstVertShader, 1, CodeArray, NULL);


        glCompileShader(MyFirstVertShader);

}

void ShaderCode(const GLuint &ShaderHandler,  char* FilePath)
{
    const GLchar *ShaderArray = ShaderCodeStorage(FilePath);
    glShaderSource(ShaderHandler, 1, &ShaderArray, NULL);

}


GLchar ShaderCodeStorage(const char* FilePath)
{
    ifstream infile;
    infile.open(FilePath, ios::in);
    unsigned long Filelength = getFileLength(infile);
    GLchar *ShaderCode = new char[Filelength + 1];
    ShaderCode[Filelength] = 0;
}


Molong getFileLength(ifstream& file) {
    if (!file.good()) return 0;
    file.seekg(0, ios::end);
    unsigned long Filelength = file.tellg();
    file.seekg(0, ios::beg);
    return Filelength;
}

Answer 1

以下函数是罪魁祸首:(至少有 2 个问题)

GLchar *ShaderCodeStorage(const char* FilePath)
// 1 Return type should be GLChar *
{
    ...
    ShaderCode[Filelength] = 0;
    return ShaderCode; // 2. add return
}

另外，您在哪里读取着色器文件的内容？确保填充文件内容。