從WriteFile到物理磁盤的訪問被拒絕錯誤，win7

我試圖從一個特定的物理扇區向SD卡寫入一些數據。我收到了一家公司的代碼，他們說它可以在windows-xp上正常工作。這與WriteFile error #5 "denied access" under win Vista/seven
是一樣的情況下面是將數據寫入SD卡的部分（在我的cae drv值爲'F'）。從其他人那裏讀取，我添加了鎖定和dismont，但鎖定失敗（也下載了）。我對Windows編程不太熟悉。有人能告訴我這段代碼有什麼問題嗎？謝謝你的幫助。（BTW I; m鎖定3GiB）從WriteFile到物理磁盤的訪問被拒絕錯誤，win7

u32 HDD_write(u8 drv, u32 SecAddr, u32 blocks, u8 *buf) 
{ 
    u32 ret = 0; 
    u32 ldistanceLow, ldistanceHigh, dwpointer, bytestoread, numread; 
    char cur_drv[100]; 
    HANDLE g_hDevice; 

    sprintf(cur_drv, "\\\\.\\%c:",drv); // , (u32)drv); 
    g_hDevice = CreateFile(cur_drv, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); 

    if(g_hDevice == INVALID_HANDLE_VALUE) 
    return 0; 

    // lock and dismount 
    ret = LockFile(g_hDevice, 0, 0, 3 * 1023 * 1023 * 1023, 0); 
    printf("ret = %d", ret); 
    DeviceIoControl(g_hDevice, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL, 0, NULL, NULL); 
    printf("error = %d", GetLastError()); 

    ldistanceLow = SecAddr << 9; 
    ldistanceHigh = SecAddr >> (32-9); 
    dwpointer = SetFilePointer(g_hDevice, ldistanceLow, (long *)&ldistanceHigh, FILE_BEGIN); 

    if(dwpointer != 0xFFFFFFFF) { 
    bytestoread = blocks * 512; 
    ret = WriteFile(g_hDevice, buf, bytestoread, (unsigned long *)&numread, NULL); 
    if(ret) ret = 1; 
    else  { 
     ret = 0; 
     printf("error = %d", GetLastError()); 
    } 
    } 

    CloseHandle(g_hDevice); 
    return ret; 
}

來源

2014-11-25 Chan Kim

當'LockFile（）'失敗時'GetLastError（）'返回什麼？ – Cyclonecode 2014-11-25 08:26:49

你試過用DeviceIoControl（g_hDevice，FSCTL_LOCK_VOLUME，NULL，0，NULL，0，＆dwBytesReturned，NULL）來鎖定音量嗎？ – Cyclonecode 2014-11-25 08:37:37

[CreateFile：對原始磁盤的直接寫入操作「Access is denied」 - Vista，Win7]的可能的重複（http://stackoverflow.com/questions/8694713/createfile-direct-write-operation-to-raw-disk- access-is-denied-vista-win7） – Xearinox 2014-11-25 11:18:06

我幾天前解決了這個問題，並忘記檢查我的問題在這裏。這是我使用的代碼。創建文件時（對於分區磁盤），我們還需要GENERIC_READ用於塊設備。鑰匙首先被卸下然後鎖上。

u32 HDD_write(u8 drv, u32 SecAddr, u32 blocks, u8 *buf) { 
    u32 ret = 0; 
    u32 ldistanceLow, ldistanceHigh, dwpointer, bytestoread, numread; 
    char cur_drv[100]; 
    HANDLE g_hDevice; 
    DWORD status; 

    //sprintf(cur_drv, "\\\\.\\PhysicalDrive%d", drv); 
    sprintf(cur_drv, "\\\\.\\%c:",drv); 
    g_hDevice = CreateFile(cur_drv, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); 

    if(g_hDevice == INVALID_HANDLE_VALUE) 
    return 0; 

// dismout and lock added by ckim 

    if (!DeviceIoControl(g_hDevice, FSCTL_DISMOUNT_VOLUME, 
     NULL, 0, NULL, 0, &status, NULL)) 
    { 
     DWORD err = GetLastError(); 
     printf("Error %d attempting to dismount volume, error code\n",err); 
    } 

    // lock volume 
    if (!DeviceIoControl(g_hDevice, FSCTL_LOCK_VOLUME, 
     NULL, 0, NULL, 0, &status, NULL)) 
    { 
     printf("Error %d attempting to lock device\n", GetLastError()); 
    } 

    ldistanceLow = SecAddr << 9; 
    ldistanceHigh = SecAddr >> (32-9); 
    dwpointer = SetFilePointer(g_hDevice, ldistanceLow, (long *)&ldistanceHigh, FILE_BEGIN); 

    if(dwpointer != 0xFFFFFFFF) { 
    bytestoread = blocks * 512; 
    ret = WriteFile(g_hDevice, buf, bytestoread, (unsigned long *)&numread, NULL); 
    if(ret) ret = 1; 
    else  { 
     ret = 0; 
     printf("error = %d", GetLastError()); 
    } 
    } 

    CloseHandle(g_hDevice); 
    return ret; 
}

來源

2014-12-03 11:37:57

從WriteFile到物理磁盤的訪問被拒絕錯誤，win7

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