c++ 发送消息，模拟拖拽文件

 #include <ShlObj.h>
 BOOL SimulateDropFile(CString strFilePath)
 {
     char szFile[MAX_PATH] = {};
     wcstombs(szFile, strFilePath.GetBuffer(), _MAX_PATH);
     DWORD dwBufSize = sizeof(DROPFILES) + strlen(szFile) + ;

     //通过类名或窗口标题 找到接受拖拽的窗口
     HWND hMain = ::FindWindow(NULL, _T("XX播放器"));
     if (hMain == NULL)
         return FALSE;
     BYTE* pBuf = new BYTE[dwBufSize];
     if (pBuf == NULL)
         return FALSE;

     BOOL bResult = FALSE;
     memset(pBuf, , dwBufSize);
     DROPFILES* pDrop = (DROPFILES*)pBuf;
     pDrop->pFiles = sizeof(DROPFILES);
     strcpy((char*)(pBuf + sizeof(DROPFILES)), szFile);

     DWORD dwProcessId = ;
     GetWindowThreadProcessId(hMain, &dwProcessId);
     if (dwProcessId != NULL)
     {
         HANDLE hProcess = OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_WRITE, FALSE, dwProcessId);
         if (hProcess != NULL)
         {
             LPSTR pszRemote = (LPSTR)VirtualAllocEx(hProcess, NULL, dwBufSize, MEM_COMMIT, PAGE_READWRITE);
             if (pszRemote && WriteProcessMemory(hProcess, pszRemote, pBuf, dwBufSize, ))
             {
                 ::SendMessage(hMain, WM_DROPFILES, (WPARAM)pszRemote, NULL);
                 bResult = TRUE;
             }
         }
     }

     if (pBuf)
     {
         delete[] pBuf;
         pBuf = NULL;
     }
     return bResult;
 }

在调用该函数之前，先打开接受拖拽的进程
ShellExecute(NULL, L"open", exe完整路径, NULL, NULL, SW_SHOWNORMAL);