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POWix: Add to Listbox from C++ Custom Action
 

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  1. POWix: Add to Listbox from C++ Custom Action
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    <p>Hi i'm trying to check the COM Ports on a users machine and then insert them into a listbox via a custom action in c++. Although it is not displaying the information and when I debug all it is saying is "Function Failed To Execute" This is my Wix code for the listbox:</p> <pre><code> &lt;Control Id="ListBoxID" Type="ListBox" Property="COMPORT" Width="80" Height="40" X="80" Y="165" Indirect="no"&gt; &lt;ListBox Property="COMPORT"&gt; &lt;/ListBox&gt; &lt;Condition Action="hide"&gt;(DEVICETYPE = "1")&lt;/Condition&gt; &lt;Condition Action="show"&gt;(DEVICETYPE = "2")&lt;/Condition&gt; &lt;Condition Action="show"&gt;(DEVICETYPE = "3")&lt;/Condition&gt; &lt;Condition Action="hide"&gt;(DEVICETYPE = "4")&lt;/Condition&gt; &lt;/Control&gt; </code></pre> <p>And this is my Custom Action:</p> <pre><code>extern "C" UINT __stdcall GetDatascanPort(MSIHANDLE hInstall) { HRESULT hr = S_OK; UINT er = ERROR_SUCCESS; HKEY keyHandle; DWORD i,openStatus,cb_value_buffer,cb_buffer,dwType; char value_buffer[100],buffer[10]; MSIHANDLE hTable = NULL; MSIHANDLE hColumns = NULL; MSIDBERROR insertError = MSIDBERROR_NOERROR; hr = WcaInitialize(hInstall, "GetDatascanPort"); ExitOnFailure(hr, "Failed to initialize"); WcaLog(LOGMSG_STANDARD, "Initialized."); if (RegCreateKeyEx( HKEY_LOCAL_MACHINE, "HARDWARE\\DEVICEMAP\\SERIALCOMM", 0, "", REG_OPTION_NON_VOLATILE, KEY_QUERY_VALUE, default_sa(), &amp;keyHandle, &amp;openStatus ) == ERROR_SUCCESS ) { for (i=0;;i++) { cb_value_buffer = sizeof(value_buffer); cb_buffer = sizeof(buffer); if (RegEnumValue(keyHandle, i, value_buffer, &amp;cb_value_buffer, NULL, &amp;dwType, (unsigned char *) buffer, &amp;cb_buffer) != ERROR_SUCCESS) break; if (dwType != REG_SZ || strlen(buffer) &gt; 6) continue; hr = WcaAddTempRecord(&amp;hTable, &amp;hColumns, L"ListBox",&amp;insertError, 0, 4, L"COMPORT", 1, 0, buffer); ExitOnFailure(hr, "failed to set COMPORT"); } RegCloseKey(keyHandle); if (hTable) MsiCloseHandle(hTable); if (hColumns) MsiCloseHandle(hColumns); return WcaFinalize(hr); } LExit: er = SUCCEEDED(hr) ? ERROR_SUCCESS : ERROR_INSTALL_FAILURE; return WcaFinalize(er); } </code></pre> <p>Can anyone help me please? Thanks</p> <p>EDIT: I have it updating my Listbox but it is not legible, strange symbols. I changed my char to a CString like so and this seems to work apart from displaying it incorrectly.</p> <pre><code>CString ComPort; ComPort = buffer; hr = WcaAddTempRecord(&amp;hTable, &amp;hColumns, L"ListBox",&amp;insertError, 0, 4, L"COMPORT", 1, ComPort, ComPort); ExitOnFailure(hr, "failed to set COMPORT"); </code></pre> <p>Also the target computer may have serial ports what is the best method to have them all listed with my function inside the for loop?</p> <p>Thanks</p>
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    1. COHow are you trying to execute your custom action? Have you checked (using Dependency Walker) that it's actually being exported from your DLL?
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      1. USsnowdude
    2. COThe custom action is being called in Wix as I was able to breakpoint into it so that is not the problem. Thanks..:)
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    3. COSo, where are you getting the Function failed to execute error? Have you run: 'msiexec /l*vx' ?
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