Question

我正在使用以下代码将XImage写入文件“bitmap0.bmp”但是当我在fedora中使用imageViewer打开新创建的文件时，它会出现“文件过早结束”错误并且不显示任何内容。有谁可以请在下面的代码中指出问题？

typedef struct tagBITMAPFILEHEADER {
WORD    bfType;
DWORD   bfSize;
WORD    bfReserved1;
WORD    bfReserved2;
DWORD   bfOffBits;

} BITMAPFILEHEADER;

typedef struct tagBITMAPINFOHEADER{
DWORD  biSize;
LONG   biWidth;
LONG   biHeight;
WORD   biPlanes;
WORD   biBitCount;
DWORD  biCompression;
DWORD  biSizeImage;
LONG   biXPelsPerMeter;
LONG   biYPelsPerMeter;
DWORD  biClrUsed;
DWORD  biClrImportant;

} BITMAPINFOHEADER;

void saveXImageToBitmap(XImage *pImage)
{
BITMAPFILEHEADER bmpFileHeader;
BITMAPINFOHEADER bmpInfoHeader;
FILE *fp;
static int cnt = 0;
int dummy;
char filePath[255];
memset(&bmpFileHeader, 0, sizeof(BITMAPFILEHEADER));
memset(&bmpInfoHeader, 0, sizeof(BITMAPINFOHEADER));
bmpFileHeader.bfType = 0x4D42;
bmpFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +  pImage->width*pImage->height*4;
bmpFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
bmpFileHeader.bfReserved1 = 0;
bmpFileHeader.bfReserved2 = 0;

bmpInfoHeader.biSize = sizeof(BITMAPINFOHEADER);
bmpInfoHeader.biWidth = pImage->width;
bmpInfoHeader.biHeight = pImage->height;
bmpInfoHeader.biPlanes = 1;
bmpInfoHeader.biBitCount = 32;
dummy = (pImage->width * 3) % 4;
if((4-dummy)==4)
    dummy=0;
else
    dummy=4-dummy;
bmpInfoHeader.biSizeImage = ((pImage->width*3)+dummy)*pImage->height;
bmpInfoHeader.biCompression = 0;
bmpInfoHeader.biXPelsPerMeter = 0;
bmpInfoHeader.biYPelsPerMeter = 0;
bmpInfoHeader.biClrUsed = 0;
bmpInfoHeader.biClrImportant = 0;

sprintf(filePath, "bitmap%d.bmp", cnt++);
fp = fopen(filePath,"wb");

if(fp == NULL)
    return;

fwrite(&bmpFileHeader, sizeof(bmpFileHeader), 1, fp);
fwrite(&bmpInfoHeader, sizeof(bmpInfoHeader), 1, fp);
fwrite(pImage->data, 4*pImage->width*pImage->height, 1, fp);
fclose(fp);

}

Answer 1

谢谢user786653。我检查了我的结构。他们被填补了。我添加了

#pragma pack (1)

在结构中，现在它工作正常。：）

将XImage写入C中的.bmp文件

1 个答案: