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#2
rjsp2020-09-05 22:41
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图片↑（滑稽.png）
我想实用ReadFile函数读取这个图片的所有内容，代码如下↓
程序代码：#include<iostream>
#include<Windows.h>
int main()
{
HANDLE hFile = ::CreateFileA("C:\\Users\\CrezS\\Desktop\\滑稽.png", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
return 0;
unsigned long FileSize_Low, FileSize_High;
FileSize_Low = GetFileSize(hFile, &FileSize_High);
std::cout << hFile << std::endl;
std::cout << FileSize_Low << std::endl;
char* Buffer = new char[FileSize_Low];
int Read = ReadFile(hFile, Buffer, FileSize_Low, &FileSize_Low, NULL);
if (Read == 0)
return 0;
CloseHandle(hFile);
std::cout << strlen(Buffer);
}
#include<Windows.h>
int main()
{
HANDLE hFile = ::CreateFileA("C:\\Users\\CrezS\\Desktop\\滑稽.png", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
return 0;
unsigned long FileSize_Low, FileSize_High;
FileSize_Low = GetFileSize(hFile, &FileSize_High);
std::cout << hFile << std::endl;
std::cout << FileSize_Low << std::endl;
char* Buffer = new char[FileSize_Low];
int Read = ReadFile(hFile, Buffer, FileSize_Low, &FileSize_Low, NULL);
if (Read == 0)
return 0;
CloseHandle(hFile);
std::cout << strlen(Buffer);
}
第一处cout返回的是000000D4，应该是成功的~
第二处返回4911，是文件大小（图片30*30）
但第三处strlen返回的是8，怎么改都解决不了，请问是什么问题，谢谢各位大佬~
（PS:分数有限，谢谢~）
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↑输出的内容，转换成整数确实是png的文件头一部分
[此贴子已经被作者于2020-9-5 16:04编辑过]
