Win32 API - 尝试读取文件,它被截断 - 为什么？

Question

我正在尝试读取文件,然后以ASCII或HEX格式将文件显示到hEdit中.最终我将在文件信息上运行其他计算但是现在我只想看到它.

目前代码显示第一位 - "MZ" - 但就是这样.不知怎的,我不小心截断了pszFileText变量,我希望能够在我的窗口中查看整个可执行文件.

BOOL ReadInEXEFile(HWND hEdit, LPCTSTR pszFileName)
{
HANDLE hFile;
BOOL bSuccess = FALSE;

hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
    OPEN_EXISTING, 0, NULL);
if(hFile != INVALID_HANDLE_VALUE)
{
    DWORD dwFileSize;

    dwFileSize = GetFileSize(hFile, NULL);
    if(dwFileSize != 0xFFFFFFFF)
    {
        LPSTR pszFileText;

        pszFileText = GlobalAlloc(GPTR, dwFileSize + 1);
        if(pszFileText != NULL)
        {
            DWORD dwRead;
            if(ReadFile(hFile, pszFileText, dwFileSize, &dwRead, NULL))
            {
                pszFileText[dwFileSize] = 0; // Add null terminator
                if(SetWindowText(hEdit, pszFileText))
                {
                    bSuccess = TRUE; // It worked!
                }
            }
            GlobalFree(pszFileText);
        }
    }
    CloseHandle(hFile);
}
return bSuccess;

}

Answer 1

EXE文件是二进制文件,但您是在尝试按原样显示原始二进制数据,这将无法正常工作.你是在正确的轨道上认为你需要在显示它之前将二进制数据编码为十六进制.二进制数据不可显示,但十六进制是.

试试这个:

static const TCHAR Hex[] = TEXT("0123456789ABCDEF");

BOOL ReadInEXEFile(HWND hEdit, LPCTSTR pszFileName) 
{ 
    BOOL bSuccess = FALSE; 

    HANDLE hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); 
    if (hFile != INVALID_HANDLE_VALUE) 
    { 
        DWORD dwFileSize = GetFileSize(hFile, NULL); 
        if (dwFileSize != INVALID_FILE_SIZE)
        { 
            LPTSTR pszFileText = (LPTSTR) LocalAlloc(LMEM_FIXED, ((dwFileSize * 3) + 1) * sizeof(TCHAR)); 
            if (pszFileText != NULL)
            {
                BYTE buffer[1024];
                DWORD dwOffset = 0;
                DWORD dwRead; 

                for (DWORD dwFilePos = 0; dwFilePos < dwFileSize; dwFilePos += dwRead)
                {
                    if (!ReadFile(hFile, buffer, sizeof(buffer), &dwRead, NULL)) 
                    {
                        CloseHandle(hFile);
                        return FALSE;
                    }

                    if (dwRead == 0)
                        break;

                    for (DWORD idx = 0; idx < dwRead; ++idx)
                    {
                        pszFileText[dwOffset++] = Hex[(buffer[idx] & 0xF0) >> 4];
                        pszFileText[dwOffset++] = Hex[buffer[idx] & 0x0F];
                        pszFileText[dwOffset++] = TEXT(' ');
                    }
                }

                pszFileText[dwOffset] = 0; // Add null terminator 

                bSuccess = SetWindowText(hEdit, pszFileText);
                LocalFree(pszFileText);
            } 
        } 

        CloseHandle(hFile); 
    } 

    return bSuccess; 
}