LInet::SendLoadCmd
#include " ltwrappr.h "
L_INT LInet::SendLoadCmd (plRemoteComp, uCommandID, pszFile, nBitsPerPixel=0, nOrder=ORDER_BGR, uFlags=LOADFILE_ALLOCATE|LOADFILE_STORE)
LInet * plRemoteComp; |
/* instance of a remote computer */ |
L_UINT uCommandID; |
/* command id */ |
L_TCHAR * pszFile; |
/* filename */ |
L_INT nBitsPerPixel; |
/* resulting bitmap pixel depth */ |
L_INT nOrder; |
/* desired color order */ |
L_UINT uFlags; |
/* flags that determine function behavior */ |
Sends a load command to a remote computer. This function is only available in the Internet toolkit.
Parameter |
Description |
|
plRemoteComp |
Instance of the remote computer to which the command will be sent. |
|
uCommandID |
Command ID. Each command sent by a member of a connection should have a unique ID. Since a member of a connection may send several commands, this ID allows that member to identify when a specific command request has been completed . |
|
pszFile |
Character string containing the name of the image file to load. This should be the name of a file on the computer receiving the command. |
|
nBitsPerPixel |
Resulting bitmap pixel depth. The following are valid values: |
|
|
Value |
Meaning |
|
0 |
Keep the original file's pixel depth (Do not convert). |
|
1 to 8 |
The specified bits per pixel in the resultant bitmap |
|
12 |
12 bits per pixel in the resultant bitmap. |
|
16 |
16 bits per pixel in the resultant bitmap |
|
24 |
24 bits per pixel in the resultant bitmap |
|
32 |
32 bits per pixel in the resultant bitmap |
|
48 |
48 bits per pixel in the resultant bitmap |
|
64 |
64 bits per pixel in the resultant bitmap |
nOrder |
Color order for 16-, 24-, 32-, 48-, and 64-bit bitmaps. If the resultant bitmap is less than 16 bits per pixel, this will have no effect since palettized images have no order. The following are valid values: |
|
|
Value |
Meaning |
|
ORDER_RGB |
[0] Red, green, and blue color order in memory |
|
ORDER_BGR |
[1] Blue, green, and red color order in memory |
|
ORDER_GRAY |
[2] 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are only supported in the Document/Medical Imaging editions . |
|
ORDER_RGBORGRAY |
[3] Load the image as red, green, blue OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions only. |
|
ORDER_BGRORGRAY |
[4] Load the image as blue, green, red OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions only. |
uFlags |
Binary flags that determine the behavior of the loading process. You can pass some user-defined flag values, or specify one or more of the following values: |
|
|
Value |
Meaning |
|
LOADFILE_ALLOCATE |
[0x0001] The function allocates memory for the specified bitmap. (This takes place in addition to the actions of your callback function.) |
|
LOADFILE_STORE |
[0x0002] The function loads data into the specified bitmap. (This takes place in addition to the actions of your callback function.) |
Returns
SUCCESS |
This function was successful. |
< 1 |
An occurred. Refer to Return Codes. |
Comments
The remote computer should respond by calling LInet::SendLoadRspin its LInet::CommandCallBackfunction.
With this command, the local computer will signal the remote computer to load a bitmap and send across the bitmap identifier (not the bitmap data!). The local computer can then use the bitmap identifier in other commands (like LInet::SendAttachBitmapCmd). The bitmap identifier will be sent in the response to this command.
To process responses to commands, a class must be derived from LInet and the LInet::ResponseCallBackmember function must be overridden.
The LInet::CommandCallBack function will receive the pszFile, nBitsPerPixel, nOrder and uFlags information in the pParams parameter. The pszFile information will be in pParams[0]. The nBitsPerPixel information will be in pParams[1], and so forth.
Required DLLs and Libraries
LTNET For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Functions: |
LInet::SendLoadRsp, LInet::CommandCallBack, LInet::ResponseCallBack, Class Members |
Topics: |
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Example
//This example sends a message to a remote connection to create a window. //It is assumed that: //1. the network as been started (LInet::StartUp()) //2. a connection has been established with a remote server (LInet::m_Inet.Connect()) class LUserNet4 : public LInet { public: L_INT OnConnect(LInet *plConnection, L_INT nError) { L_INT nRet = SUCCESS; L_CHAR *pszHostName; L_TCHAR strMsg[L_MAXPATH]; if(nError != SUCCESS) { wsprintf(strMsg, _T("Error[%d]: OnConnect"), nRet); MessageBox(NULL, strMsg, 0 , 0); return nError; } // Get the remote computer name if ((pszHostName = plConnection->GetHostName(HOST_NAME_IP)) == NULL) return FAILURE; wsprintf(strMsg, _T("OnConnect: Connected to %hs"), (LPTSTR)pszHostName); MessageBox(0, strMsg, 0, 0); this->SendLoadCmd(plConnection, CMD_LOAD, TEXT("E:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.CMP")); return nRet; } L_INT CommandCallBack (LInet * plConnection, CMDTYPE uCommand, L_UINT uCommandID, L_INT nError, L_UINT uParams, pPARAMETER pParams, L_UINT uExtra, L_CHAR*pExtra); }; LUserNet4 m_ClientInet; L_INT LInet__SendLoadCmdExample(LInet * pInetRemoteServer) { L_INT nRet = SUCCESS; nRet = m_ClientInet.SendLoadCmd( pInetRemoteServer, 0, TEXT("E:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.CMP")); if(nRet != SUCCESS && nRet != ERROR_DATA_QUEUED) return nRet; return SUCCESS; } //The CommandCallBack() is processed on the server //To process the commands sent to the computer, you must: //1. Derive a class from LInet //2. Override the CommandCallBack member function L_INT LUserNet4::CommandCallBack (LInet * plConnection, CMDTYPE uCommand, L_UINT uCommandID, L_INT nError, L_UINT uParams, pPARAMETER pParams, L_UINT uExtra, L_CHAR*pExtra) { UNREFERENCED_PARAMETER(pExtra); UNREFERENCED_PARAMETER(uExtra); UNREFERENCED_PARAMETER(uParams); UNREFERENCED_PARAMETER(pParams); UNREFERENCED_PARAMETER(uCommandID); UNREFERENCED_PARAMETER(plConnection); L_INT nStatus = ERROR_FEATURE_NOT_SUPPORTED; if(nError != SUCCESS) nStatus = ERROR_TRANSFER_ABORTED; else { switch(uCommand) { case CMD_LOAD: { //Add your code here for loading the bitmap } break; default: { return nStatus; } } } return nStatus; }