【发布时间】：2026-01-01 07:05:01
【问题描述】：
我是opengl的新手。我正在尝试使用 opengl 加载图像。但我无法这样做。它给了我这个错误：
*** Error in `./lena': double free or corruption (top) : 0x0000000001353070 ***
我不知道我做错了什么。我的代码已在下面给出。实际上这不是我的代码。我在另一个名叫 Ollo 的人的 Stack Overflow 帖子中看到了它。
#include <bits/stdc++.h>
#include <GL/glut.h>
using namespace std;
struct BITMAPFILEHEADER
{
int bfType; //specifies the file type
long long bfSize; //specifies the size in bytes of the bitmap file
int bfReserved1; //reserved; must be 0
int bfReserved2; //reserved; must be 0
long long bOffBits; //species the offset in bytes from the bitmapfileheader to the bitmap bits
};
struct BITMAPINFOHEADER
{
long long biSize; //specifies the number of bytes required by the struct
long long biWidth; //specifies width in pixels
long long biHeight; //species height in pixels
int biPlanes; //specifies the number of color planes, must be 1
int biBitCount; //specifies the number of bit per pixel
long long biCompression;//spcifies the type of compression
long long biSizeImage; //size of image in bytes
long long biXPelsPerMeter; //number of pixels per meter in x axis
long long biYPelsPerMeter; //number of pixels per meter in y axis
long long biClrUsed; //number of colors used by th ebitmap
long long biClrImportant; //number of colors that are important
};
int main(void){
FILE *filePtr;
BITMAPFILEHEADER bitmapFileHeader;
BITMAPINFOHEADER *bitmapInfoHeader = new BITMAPINFOHEADER;
unsigned char *bitmapImage; //store image data
int imageIdx=0; //image index counter
unsigned char tempRGB; //our swap variable
filePtr = fopen("lena.bmp","rb");
if (filePtr == NULL)
cout << "ERROR!!! 1" << endl;
fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER),1,filePtr);
fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER),1,filePtr); // small edit. forgot to add the closing bracket at sizeof
//move file point to the begging of bitmap data
fseek(filePtr, bitmapFileHeader.bOffBits, SEEK_SET);
//allocate enough memory for the bitmap image data
bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage);
//verify memory allocation
if (!bitmapImage)
{
free(bitmapImage);
fclose(filePtr);
}
//read in the bitmap image data
fread(bitmapImage, bitmapInfoHeader->biSizeImage, 1, filePtr);
//make sure bitmap image data was read
if (bitmapImage == NULL)
{
fclose(filePtr);
}
//swap the r and b values to get RGB (bitmap is BGR)
for (imageIdx = 0;imageIdx < bitmapInfoHeader->biSizeImage;imageIdx+=3)
{
tempRGB = bitmapImage[imageIdx];
bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
bitmapImage[imageIdx + 2] = tempRGB;
}
return 0;
}
【问题讨论】：
-
一方面，当
bitmapImage为0 时，你为什么要调用free (...)？如果你尝试这个，C 标准库足够聪明，不会做任何事情，但它仍然没有任何意义。 -
我已经使用了这里写的代码@AndonM.Coleman
-
如果我删除了空闲部分，那么它会给我一个分段错误；
-
这是什么操作系统？为什么要手动读取 BMP？有用于读取大多数图像格式的操作系统例程。您不应该自己编写此代码。另外，这与OpenGL或C++无关，所以我要删除那些标签。