我想开始使用OpenGL 3+和4但是我遇到了让Glew工作的问题。我试图在附加依赖项中包含glew32.lib，我已将库和.dll移动到主文件夹中，因此不应存在任何路径问题。我得到的错误是：
Error 5 error LNK2019: unresolved external symbol __imp__glewInit referenced in function "void __cdecl init(void)" (?init@@YAXXZ) C:\Users\Mike\Desktop\Test Folder\ModelLoader through VBO\ModelLoader\main.obj ModelLoader
Error 4 error LNK2019: unresolved external symbol __imp__glewGetErrorString referenced in function "void __cdecl init(void)" (?init@@YAXXZ) C:\Users\Mike\Desktop\Test Folder\ModelLoader through VBO\ModelLoader\main.obj ModelLoader
Error 3 error LNK2001: unresolved external symbol __imp____glewGenBuffers C:\Users\Mike\Desktop\Test Folder\ModelLoader through VBO\ModelLoader\main.obj ModelLoader
Error 1 error LNK2001: unresolved external symbol __imp____glewBufferData C:\Users\Mike\Desktop\Test Folder\ModelLoader through VBO\ModelLoader\main.obj ModelLoader
Error 2 error LNK2001: unresolved external symbol __imp____glewBindBuffer C:\Users\Mike\Desktop\Test Folder\ModelLoader through VBO\ModelLoader\main.obj ModelLoader
以下是我的大部分代码：
#define NOMINMAX
#include <vector>
#include <memory>
#include <string>
#include <iostream>
#include <fstream>
#include <sstream>
#include <Windows.h>
#include <cstdio>
#include <time.h>
#include "GL\glew.h"
#include "glut.h"
#pragma comment(lib, "glew32.lib")
#pragma comment(lib, "opengl32.lib")
using namespace std;
GLsizei screen_width, screen_height;
float camera[3] = {0.0f, 10.0f, -15.0f};
float xPos = 0;
float yPos = 10;
float zPos = -15;
float orbitDegrees = 0;
clock_t sTime;
float fPS;
int fCount;
GLdouble* modelV;
GLdouble* projM;
GLint* vPort;
//Lights settings
GLfloat light_ambient[]= { 0.1f, 0.1f, 0.1f, 0.1f };
GLfloat light_diffuse[]= { 1.0f, 1.0f, 1.0f, 0.0f };
GLfloat light_specular[]= { 1.0f, 1.0f, 1.0f, 0.0f };
GLfloat light_position[]= { 100.0f, 0.0f, -10.0f, 1.0f };
//Materials settings
GLfloat mat_ambient[]= { 0.5f, 0.5f, 0.0f, 0.0f };
GLfloat mat_diffuse[]= { 0.5f, 0.5f, 0.0f, 0.0f };
GLfloat mat_specular[]= { 1.0f, 1.0f, 1.0f, 0.0f };
GLfloat mat_shininess[]= { 1.0f };
typedef struct Vectors {
float x;
float y;
float z;
}Vector;
typedef struct Polys {
Vector v;
Vector vt;
Vector vn;
int texture;
} Poly;
vector<Vector> vecs;
vector<Vector> normVecs;
vector<Vector> textVecs;
vector<Poly> polyList;
void loadModel(string filepath);
void createTex(string ref);
void render();
// An array of 3 vectors which represents 3 vertices
static const GLfloat g_vertex_buffer_data[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
};
void render()
{
}
void createTex(string ref)
{
}
void loadModel(string filepath)
{
}
void resize (int p_width, int p_height)
{
if(screen_width==0 && screen_height==0) exit(0);
screen_width=p_width; // Obtain the new screen width values and store it
screen_height=p_height; // Height value
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear both the color and the depth buffer so to draw the next frame
glViewport(0,0,screen_width,screen_height); // Viewport transformation
glMatrixMode(GL_PROJECTION); // Projection transformation
glLoadIdentity(); // Initialize the projection matrix as identity
gluPerspective(45.0f,(GLfloat)screen_width/(GLfloat)screen_height,1.0f,10000.0f);
glutPostRedisplay(); // This command redraw the scene (it calls the same routine of glutDisplayFunc)
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // This clear the background color to dark blue
glMatrixMode(GL_MODELVIEW); // Modeling transformation
glPushMatrix();
glLoadIdentity(); // Initialize the model matrix as identity
gluLookAt(xPos, yPos, zPos, /* look from camera XYZ */
0, yPos, 0, /* look at the origin */
0, 1, 0); /* positive Y up vector */
glRotatef(orbitDegrees, 0.f, 1.0f, 0.0f);
//glTranslatef(0.0,0.0,-20); // We move the object forward (the model matrix is multiplied by the translation matrix)
//rotation_x = 30;
//rotation_x = rotation_x + rotation_x_increment;
//rotation_y = rotation_y + rotation_y_increment;
//rotation_z = rotation_z + rotation_z_increment;
//if (rotation_x > 359) rotation_x = 0;
//if (rotation_y > 359) rotation_y = 0;
//if (rotation_z > 359) rotation_z = 0;
// glRotatef(rotation_x,1.0,0.0,0.0); // Rotations of the object (the model matrix is multiplied by the rotation matrices)
//glRotatef(rotation_y,0.0,1.0,0.0);
// glRotatef(rotation_z,0.0,0.0,1.0);
//if (objarray[0]->id_texture!=-1)
//{
// glBindTexture(GL_TEXTURE_2D, objarray[0]->id_texture); // We set the active texture
// glEnable(GL_TEXTURE_2D); // Texture mapping ON
// printf("Txt map ON");
//}
//else
// glDisable(GL_TEXTURE_2D); // Texture mapping OFF
glGetDoublev(GL_PROJECTION_MATRIX, modelV);
glGetDoublev(GL_PROJECTION_MATRIX, projM);
glGetIntegerv(GL_VIEWPORT, vPort);
if(clock() > sTime)
{
fPS = fCount;
fCount = 0;
sTime = clock() + CLOCKS_PER_SEC;
}
render();
glDisable(GL_LIGHTING);
GLdouble pos[3];
gluUnProject(100, yPos, -14, modelV, projM, vPort, &pos[0], &pos[1], &pos[2]);
char buffer2[255];
int pAmmount = sprintf(buffer2,"FPS: %.2f", fPS);
//glRasterPos3f(pos[0], pos[1], pos[2]);
for(int i = 0; i < pAmmount; i++)
{
glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, buffer2[i]);
}
glEnable(GL_LIGHTING);
/*glPopMatrix();
glPushMatrix();
glTranslatef(5.0,0.0,-20.0);
objarray[1]->render();*/
glPopMatrix();
glFlush(); // This force the execution of OpenGL commands
glutSwapBuffers(); // In double buffered mode we invert the positions of the visible buffer and the writing buffer
fCount++;
}
void keyboard(unsigned char k, int x, int y)
{
switch(k)
{
case 'w':
yPos++;
break;
case 's':
yPos--;
break;
case 'a':
xPos--;
break;
case 'd':
xPos++;
break;
case 'q':
orbitDegrees--;
break;
case 'e':
orbitDegrees++;
break;
case 'z':
zPos--;
break;
case 'x':
zPos++;
break;
}
}
void initWindow(GLsizei screen_width, GLsizei screen_height)
{
glClearColor(0.0, 0.0, 0.0, 0.0); // Clear background color to black
// Viewport transformation
glViewport(0,0,screen_width,screen_height);
// Projection transformation
glMatrixMode(GL_PROJECTION); // Specifies which matrix stack is the target for matrix operations
glLoadIdentity(); // We initialize the projection matrix as identity
gluPerspective(45.0f,(GLfloat)screen_width/(GLfloat)screen_height,1.0f,10000.0f); // We define the "viewing volume"
gluLookAt(camera[0], camera[1], camera[2], /* look from camera XYZ */
0, 0, 0, /* look at the origin */
0, 1, 0); /* positive Y up vector */
try
{
//loadModel("Goku habit dechiré.obj");
loadModel("Flooring.obj");;
}
catch(string& filepath)
{
cerr << "Model could not be loaded: " << filepath << endl;
filepath = "Model could not be loaded: " + filepath;
wostringstream sString;
sString << filepath.c_str();
MessageBox(HWND_DESKTOP, sString.str().c_str(), L"Error: loadModel(string filepath)", MB_OK);
}
//Lights initialization and activation
glLightfv (GL_LIGHT1, GL_AMBIENT, light_ambient);
glLightfv (GL_LIGHT1, GL_DIFFUSE, light_diffuse);
glLightfv (GL_LIGHT1, GL_DIFFUSE, light_specular);
glLightfv (GL_LIGHT1, GL_POSITION, light_position);
glEnable (GL_LIGHT1);
glEnable (GL_LIGHTING);
//Materials initialization and activation
glMaterialfv (GL_FRONT, GL_AMBIENT, mat_ambient);
glMaterialfv (GL_FRONT, GL_DIFFUSE, mat_diffuse);
glMaterialfv (GL_FRONT, GL_DIFFUSE, mat_specular);
glMaterialfv (GL_FRONT, GL_POSITION, mat_shininess);
//Other initializations
glShadeModel(GL_SMOOTH); // Type of shading for the polygons
//glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Texture mapping perspective correction
//glEnable(GL_TEXTURE_2D); // Texture mapping ON
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL); // Polygon rasterization mode (polygon filled)
glEnable(GL_CULL_FACE); // Enable the back face culling
glEnable(GL_DEPTH_TEST); // Enable the depth test
glEnable(GL_NORMALIZE);
/*float* matrix = new float[16];
glGetFloatv(GL_PROJECTION_MATRIX, matrix);
for(int i = 0; i < 4; i++)
{
cout << matrix[0] << " " << matrix[1] << " " << matrix[2] << " " << matrix[3] << endl;
matrix += 3;
}*/
modelV = new GLdouble[16];
projM = new GLdouble[16];
vPort = new GLint[4];
sTime = clock() + CLOCKS_PER_SEC;
}
void init()
{
GLenum GlewInitResult;
GlewInitResult = glewInit();
if (GLEW_OK != GlewInitResult) {
fprintf(
stderr,
"ERROR: %s\n",
glewGetErrorString(GlewInitResult)
);
exit(EXIT_FAILURE);
}
// This will identify our vertex buffer
GLuint vertexbuffer;
// Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, &vertexbuffer);
// The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
// Give our vertices to OpenGL.
glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
}
int main(int argc, char **argv)
{
screen_width = 800;
screen_height = 800;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(screen_width,screen_height);
glutInitWindowPosition(0,0);
glutCreateWindow("ModelLoader");
glutDisplayFunc(display);
glutIdleFunc(display);
glutReshapeFunc (resize);
glutKeyboardFunc(keyboard);
//glutKeyboardFunc(keyboard);
//glutSpecialFunc(keyboard_s);
initWindow(screen_width, screen_height);
init();
glutMainLoop();
return 0;
}
答案 0 :(得分：8)
您有链接问题。您没有向链接器提供glew lib文件的正确路径。因此，链接器无法找到您正在调用的函数的已编译代码。
从您的日志中，您似乎正在使用Windows。如果您使用的是Visual Studio，请右键单击您的项目。选择链接器，然后选择输入。验证其他依赖项是否包含glew lib的路径。
请注意，链接时不需要dll。这将仅在运行时加载（请记住将其放在与可执行文件相同的文件夹中或系统路径中列出的路径中）。
答案 1 :(得分：3)
这已得到修复。这个问题只出现在我在大学使用的机器上。问题是该机器有一个较旧的.dll，它与我在解决方案文件中的.dll相冲突。它安装在机器的系统文件中。因此它产生了这些错误。
下次我应该检查这件事。
答案 2 :(得分：2)
不确定它对您有何帮助，但您可以尝试将项目静态链接到“.a”库。或者是Windows上的.lib。如果有未解析的符号，则表示它尝试链接到库而不是真正的dll。
如果它正在使用dll，它可能会在运行时失败。