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POSetting the text colour of a RichEdit from a different process
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  1. POSetting the text colour of a RichEdit from a different process
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    copied!<p>I'm trying to set the background and foreground colour for specific words in a richedit control (class RichEdit20W) from a different process. I have the following C code that I call using python, but it fails (SendMessage returns 0). It works if I change SCF_SELECTION to SFC_ALL or 0, but sadly it doesn't fit my needs as I only need the change to apply to part of the text in the control.</p> <p>Here's the code:</p> <pre><code>#include &lt;Windows.h&gt; #include &lt;stdio.h&gt; #include &lt;limits.h&gt; #include &lt;Richedit.h&gt; __declspec(dllexport) LRESULT SetColour(HWND hWnd, COLORREF textColor, COLORREF bgColor) { CHARRANGE cr; cr.cpMin = 3; cr.cpMax = 8; CHARFORMAT2 cf; cf.cbSize = sizeof(cf); cf.dwMask = CFM_COLOR | CFM_BACKCOLOR; cf.crTextColor = textColor; cf.crBackColor = bgColor; DWORD dwPID; HANDLE hProcess; LPVOID pRemoteCR; LPVOID pRemoteCF; SIZE_T zWritten; LRESULT lResult; GetWindowThreadProcessId(hWnd, &amp;dwPID); hProcess = OpenProcess(PROCESS_VM_WRITE | PROCESS_VM_OPERATION, FALSE, dwPID); // Allocate memory on the target process &amp; write the CHARFORMAT2 structure there pRemoteCR = VirtualAllocEx(hProcess, NULL, sizeof cr, MEM_COMMIT, PAGE_READWRITE); WriteProcessMemory(hProcess, pRemoteCR, &amp;cr, sizeof cr, &amp;zWritten); SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM)pRemoteCR); VirtualFreeEx(hProcess, pRemoteCR, 0, MEM_RELEASE); pRemoteCF = VirtualAllocEx(hProcess, NULL, sizeof cf, MEM_COMMIT, PAGE_READWRITE); WriteProcessMemory(hProcess, pRemoteCF, &amp;cf, sizeof cf, &amp;zWritten); lResult = SendMessage(hWnd, EM_SETCHARFORMAT, (WPARAM)SCF_SELECTION, (LPARAM)pRemoteCF); // SCF_SELECTION VirtualFreeEx(hProcess, pRemoteCF, 0, MEM_RELEASE); return lResult; } BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD dwReason,LPVOID lpvReserved) { return TRUE; } </code></pre>
 

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