Question

我有标题和信息标题。第一个像素使用以下代码读取正常。

// The BMPHEADER structure.
typedef struct {
byte        sigB;
byte        sigM;
int32_t     fileSize;
int16_t     resv1;
int16_t     resv2;
int32_t     pixelOffset;
} tBmpHeader;

// The BMPINFOHEADER structure.
typedef struct {
int32_t     size;
int32_t     width;
int32_t     height;
int16_t     colorPlanes;
int16_t     bitsPerPixel;
byte        zeros[24];
} tBmpInfoHeader;

typedef uint8_t byte;

typedef struct {
byte blue;
byte green;
byte red;
} tPixel;

// A BMP image consists of the BMPHEADER and BMPINFOHEADER structures, and the 2D pixel array.
typedef struct {
tBmpHeader      header;
tBmpInfoHeader  infoHeader;
tPixel          **pixel;
} tBmp;

tPixel **BmpPixelAlloc(int pWidth, int pHeight)
{
    tPixel **pixels = (tPixel **)malloc (pHeight * sizeof(tPixel *));
    for (int row = 0; row < pHeight; ++row)
    {
        pixels[row] = (tPixel *)malloc(pWidth * sizeof(tPixel));
    }

    return pixels;
}

tError BmpRead(char *pFilename, tBmp *pBmp)
{
pBmp->pixel = BmpPixelAlloc(pBmp->infoHeader.width, pBmp->infoHeader.height);

if(FileRead(file, &pBmp->pixel, sizeof(tPixel), 1)!=0)
{ 
    errorCode = ErrorFileRead;
}
}

我正在谈话的导师说我应该做以下事情

int i = 0;
while(!feof(file))
{
    if(FileRead(file, &pBmp->pixel[i], sizeof(tPixel), 1)!=0)
    { 
    errorCode = ErrorFileRead;
    }
    ++i;
}

但是这给了我一个分段错误。如果我在循环中放置一个打印件，它会在说出分段错误之前打印几千次。我尝试使用double for循环但是甚至不能编译。我在谷歌上花了几个小时但是无法弄明白。

Answer 1

不记得我弄清楚了。

for(int i = 0; i < pBmp->infoHeader.height; ++i)
{
    for(int j = 0; j < pBmp->infoHeader.width; ++j)
    {
        if(FileRead(file, &pBmp->pixel[i][j], sizeof(tPixel), 1)!=0)
        { 
            errorCode = ErrorFileRead;
        }
    }
}

C将bmp像素读入2d数组

1 个答案: