libpng錯誤：讀取錯誤

我有一些png圖像。我打開它。比我將它保存到文件。當我嘗試打開保存的圖像時，我遇到了問題。 的libpng錯誤：上png_read_rowslibpng錯誤：讀取錯誤

這裏讀取錯誤是寫入代碼：

png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); 
png_infop info_ptr = png_create_info_struct(png_ptr); 
//created png struct 

setjmp(png_jmpbuf(png_ptr)) 
//signed 
png_init_io(png_ptr, file); 

png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGBA, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 
//set header 
unsigned char * buffer = (unsigned char*)malloc(4 *width * height); 
// created buffer 
unsigned char ** row_pointers = (unsigned char**) malloc(height * sizeof(unsigned char *)); // created rows pointers 
for (int i= 0; i< height ; i++) { 
    row_pointers[i] = buffer + i * 4 * width; 
} 

memset(buffer, 255, 4 * height * width); // fill buffer with white image for example. 
// **I mean that the same problem is even when i do not write the opened image, 
//but just fill it with white**. 

png_write_image(png_ptr, row_pointers); 
//write data 

png_write_end(png_ptr, NULL); 

png_destroy_write_struct(&png_ptr, (png_infopp)NULL);

來源

2012-11-23 B.S.

你有沒有試圖用其他閱讀器/瀏覽器打開你的png文件？這應該有助於你縮小問題的原因 – leonbloy

我也看到那裏的文件已損壞 –

如的libpng/example.c所示，把這個png_set_IHDR後（）：

// Write the file header information. REQUIRED 

png_write_info(png_ptr, info_ptr);

來源

2014-02-18 00:35:26

libpng錯誤：讀取錯誤

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