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Writing Your Own Install and Uninstall Code


Writing Your Own Install and Uninstall Code

Listing 3 A self-deleting executable


#include <windows.h>
#include "SelfDelete.h"

void WriteResourceToFile(HINSTANCE hInstance,
                         int idResource,
                         char const *filename)
{
    //  access the binary resource
    HRSRC hResInfo = FindResource(hInstance, MAKEINTRESOURCE(idResource),
                                  MAKEINTRESOURCE(RC_BINARYTYPE));
    HGLOBAL hgRes = LoadResource(hInstance, hResInfo);
    void *pvRes = LockResource(hgRes);
    DWORD cbRes = SizeofResource(hInstance, hResInfo);

    //  write the binary resource to a file
    HANDLE hFile = CreateFile(filename, GENERIC_WRITE, 0, 0, CREATE_ALWAYS,
                              FILE_ATTRIBUTE_NORMAL, 0);
    DWORD cbWritten;
    WriteFile(hFile, pvRes, cbRes, &cbWritten, 0);
    CloseHandle(hFile);
}

void SelfDelete(HINSTANCE hInstance)
{
    WriteResourceToFile(hInstance, ID_MAGICDEL_DLL, "magicdel.dll");

    //  Build command line
    //  1. Find rundll32.exe
    char commandLine[MAX_PATH * 3];
    GetWindowsDirectory(commandLine, sizeof(commandLine));
    lstrcat(commandLine, "\\rundll32.exe");

    if (GetFileAttributes(commandLine) == INVALID_FILE_ATTRIBUTES)
    {
        GetSystemDirectory(commandLine, sizeof(commandLine));
        lstrcat(commandLine, "\\rundll32.exe");
    }

    //  2. Add rundll32.exe parameters
    lstrcat(commandLine, " magicdel.dll,_MagicDel@16 ");

    //  3. Add this file name
    char thisName[MAX_PATH];
    GetModuleFileName(hInstance, thisName, sizeof(thisName));
    lstrcat(commandLine, thisName);

    //  Execute the command line 
    PROCESS_INFORMATION procInfo;
    STARTUPINFO startInfo;        
    memset(&startInfo, 0, sizeof(startInfo));
    startInfo.dwFlags = STARTF_FORCEOFFFEEDBACK;
    CreateProcess(0, commandLine, 0, 0, FALSE, NORMAL_PRIORITY_CLASS, 0, 0,
                  &startInfo, &procInfo);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
{
    SelfDelete(hInstance);
}


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