Updating Resources

The following example copies a dialog box resource from one executable file, HAND.EXE, to another, FOOT.EXE, by following these steps:

1. The LoadLibrary function loads the executable file HAND.EXE.

2. The FindResource and LoadResource functions locate and load the dialog box resource named If from the file.

3. The LockResource function returns a pointer to the dialog box resource data.

4. The BeginUpdateResource function opens an update handle FOOT.EXE.

5. The UpdateResource function copies the dialog box resource from HAND.EXE to FOOT.EXE.

6. The EndUpdateResource function completes the update.

The following code implements these steps.

HRSRC hResLoad; // handle to loaded resource

HANDLE hExe; // handle to existing .EXE file

HRSRC hRes; // handle/ptr. to res. info. in hExe

HANDLE hUpdateRes; // update resource handle

char *lpResLock; // pointer to resource data

BOOL result;

// Load the .EXE file that contains the dialog box you want to copy.

hExe = LoadLibrary("hand.exe");

if (hExe == NULL) {

ErrorHandler("Could not load exe.");

}

// Locate the dialog box resource in the .EXE file.

hRes = FindResource(hExe, "AboutBox", RT_DIALOG);

if (hRes == NULL) {

ErrorHandler("Could not locate dialog box.");

}

// Load the dialog box into global memory.

hResLoad = LoadResource(hExe, hRes);

if (hResLoad == NULL) {

ErrorHandler("Could not load dialog box.");

}

// Lock the dialog box into global memory.

lpResLock = LockResource(hRes);

if (lpResLock == NULL) {

ErrorHandler("Could not lock dialog box.");

}

// Open the file to which you want to add the dialog box resource.

hUpdateRes = BeginUpdateResource("foot.exe", FALSE);

if (hUpdateRes == NULL) {

ErrorHandler("Could not open file for writing.");

}

// Add the dialog box resource to the update list.

result = UpdateResource(hUpdateRes, // update resource handle

RT_DIALOG, // change dialog box resource

"AboutBox", // dialog box name

MAKELANGID(LANG_NEUTRAL,

SUBLANG_NEUTRAL), // neutral language ID

lpResLock, // ptr to resource info

SizeofResource(hExe, hRes)); // size of resource info.

if (result == FALSE) {

ErrorHandler("Could not add resource.");

}

// Write changes to FOOT.EXE and then close it.

if (!EndUpdateResource(hUpdateRes, FALSE)) {

ErrorHandler("Could not write changes to file.");

}

// Clean up.

if (!FreeLibrary(hExe)) {

ErrorHandler("Could not free executable.");

}

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