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load libftd2xx via dlopen rather than linking to it with ld,

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so that GC won't crash if it's not there
This commit is contained in:
Sean C. Rhea
2009-01-24 17:50:06 +00:00
parent 03e2f95c43
commit a6f269363e
3 changed files with 91 additions and 18 deletions
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96
src/D2XX.cpp
View File

@@ -17,6 +17,68 @@
*/
#include "D2XX.h"
#include <dlfcn.h>
// D2XXWrapper is a wrapper around libftd2xx to make it amenable to loading
// with dlopen().
#define LOAD_SYM(type,var,name) \
var = (type*) dlsym(handle, name); \
if (!var) { \
error = QString("could not load symbol ") + name; \
return false; \
}
typedef FT_STATUS FP_OpenEx(PVOID pArg1, DWORD Flags, FT_HANDLE *pHandle);
typedef FT_STATUS FP_Close(FT_HANDLE ftHandle);
typedef FT_STATUS FP_SetBaudRate(FT_HANDLE ftHandle, ULONG BaudRate);
typedef FT_STATUS FP_SetDataCharacteristics(FT_HANDLE ftHandle, UCHAR WordLength, UCHAR StopBits, UCHAR Parity);
typedef FT_STATUS FP_SetFlowControl(FT_HANDLE ftHandle, USHORT FlowControl, UCHAR XonChar, UCHAR XoffChar);
typedef FT_STATUS FP_GetQueueStatus(FT_HANDLE ftHandle, DWORD *dwRxBytes);
typedef FT_STATUS FP_SetTimeouts(FT_HANDLE ftHandle, ULONG ReadTimeout, ULONG WriteTimeout);
typedef FT_STATUS FP_Read(FT_HANDLE ftHandle, LPVOID lpBuffer, DWORD nBufferSize, LPDWORD lpBytesReturned);
typedef FT_STATUS FP_Write(FT_HANDLE ftHandle, LPVOID lpBuffer, DWORD nBufferSize, LPDWORD lpBytesWritten);
typedef FT_STATUS FP_CreateDeviceInfoList(LPDWORD lpdwNumDevs);
typedef FT_STATUS FP_GetDeviceInfoList(FT_DEVICE_LIST_INFO_NODE *pDest, LPDWORD lpdwNumDevs);
struct D2XXWrapper {
void *handle;
FP_OpenEx *open_ex;
FP_Close *close;
FP_SetBaudRate *set_baud_rate;
FP_SetDataCharacteristics *set_data_characteristics;
FP_SetFlowControl *set_flow_control;
FP_GetQueueStatus *get_queue_status;
FP_SetTimeouts *set_timeouts;
FP_Read *read;
FP_Write *write;
FP_CreateDeviceInfoList *create_device_info_list;
FP_GetDeviceInfoList *get_device_info_list;
D2XXWrapper() : handle(NULL) {}
~D2XXWrapper() { if (handle) dlclose(handle); }
bool init(QString &error) {
const char *libname = "libftd2xx.dylib";
handle = dlopen(libname, RTLD_NOW);
if (!handle) {
error = QString("couldn't load library ") + libname;
return false;
}
LOAD_SYM(FP_OpenEx, open_ex, "FT_OpenEx");
LOAD_SYM(FP_Close, close, "FT_Close");
LOAD_SYM(FP_SetBaudRate, set_baud_rate, "FT_SetBaudRate");
LOAD_SYM(FP_SetDataCharacteristics, set_data_characteristics, "FT_SetDataCharacteristics");
LOAD_SYM(FP_SetFlowControl, set_flow_control, "FT_SetFlowControl");
LOAD_SYM(FP_GetQueueStatus, get_queue_status, "FT_GetQueueStatus");
LOAD_SYM(FP_SetTimeouts, set_timeouts, "FT_SetTimeouts");
LOAD_SYM(FP_Read, read, "FT_Read");
LOAD_SYM(FP_Write, write, "FT_Write");
LOAD_SYM(FP_CreateDeviceInfoList, create_device_info_list, "FT_CreateDeviceInfoList");
LOAD_SYM(FP_GetDeviceInfoList, get_device_info_list, "FT_GetDeviceInfoList");
return true;
}
};
static D2XXWrapper *lib; // singleton lib instance
bool D2XXRegistered = Device::addListFunction(&D2XX::myListDevices);
@@ -36,27 +98,27 @@ D2XX::open(QString &err)
{
assert(!isOpen);
FT_STATUS ftStatus =
FT_OpenEx(info.Description, FT_OPEN_BY_DESCRIPTION, &ftHandle);
lib->open_ex(info.Description, FT_OPEN_BY_DESCRIPTION, &ftHandle);
if (ftStatus != FT_OK) {
err = QString("FT_Open: %1").arg(ftStatus);
return false;
}
isOpen = true;
ftStatus = FT_SetBaudRate(ftHandle, 9600);
ftStatus = lib->set_baud_rate(ftHandle, 9600);
if (ftStatus != FT_OK) {
err = QString("FT_SetBaudRate: %1").arg(ftStatus);
close();
}
ftStatus = FT_SetDataCharacteristics(ftHandle,FT_BITS_8,FT_STOP_BITS_1,
FT_PARITY_NONE);
ftStatus = lib->set_data_characteristics(ftHandle,FT_BITS_8,FT_STOP_BITS_1,
FT_PARITY_NONE);
if (ftStatus != FT_OK) {
err = QString("FT_SetDataCharacteristics: %1").arg(ftStatus);
close();
}
ftStatus = FT_SetFlowControl (ftHandle,FT_FLOW_NONE,
'0','0'); //the 0's are ignored
ftStatus = lib->set_flow_control(ftHandle,FT_FLOW_NONE,
'0','0'); //the 0's are ignored
if (ftStatus != FT_OK) {
err = QString("FT_SetFlowControl: %1").arg(ftStatus);
close();
@@ -69,7 +131,7 @@ void
D2XX::close()
{
assert(isOpen);
FT_Close(ftHandle);
lib->close(ftHandle);
isOpen = false;
}
@@ -78,7 +140,7 @@ D2XX::read(void *buf, size_t nbyte, QString &err)
{
assert(isOpen);
DWORD rxbytes;
FT_STATUS ftStatus = FT_GetQueueStatus(ftHandle, &rxbytes);
FT_STATUS ftStatus = lib->get_queue_status(ftHandle, &rxbytes);
if (ftStatus != FT_OK) {
err = QString("FT_GetQueueStatus: %1").arg(ftStatus);
return -1;
@@ -88,9 +150,9 @@ D2XX::read(void *buf, size_t nbyte, QString &err)
if (rxbytes > 0 && rxbytes < nbyte)
nbyte = rxbytes;
if (nbyte > rxbytes)
FT_SetTimeouts(ftHandle, 5000, 5000);
lib->set_timeouts(ftHandle, 5000, 5000);
DWORD n;
ftStatus = FT_Read(ftHandle, buf, nbyte, &n);
ftStatus = lib->read(ftHandle, buf, nbyte, &n);
if (ftStatus == FT_OK)
return n;
err = QString("FT_Read: %1").arg(ftStatus);
@@ -102,7 +164,7 @@ D2XX::write(void *buf, size_t nbyte, QString &err)
{
assert(isOpen);
DWORD n;
FT_STATUS ftStatus = FT_Write(ftHandle, buf, nbyte, &n);
FT_STATUS ftStatus = lib->write(ftHandle, buf, nbyte, &n);
if (ftStatus == FT_OK)
return n;
err = QString("FT_Write: %1").arg(ftStatus);
@@ -119,14 +181,22 @@ QVector<DevicePtr>
D2XX::myListDevices(QString &err)
{
QVector<DevicePtr> result;
if (!lib) {
lib = new D2XXWrapper;
if (!lib->init(err)) {
delete lib;
lib = NULL;
return result;
}
}
DWORD numDevs;
FT_STATUS ftStatus = FT_CreateDeviceInfoList(&numDevs);
FT_STATUS ftStatus = lib->create_device_info_list(&numDevs);
if(ftStatus != FT_OK) {
err = QString("FT_CreateDeviceInfoList: %1").arg(ftStatus);
return result;
}
FT_DEVICE_LIST_INFO_NODE *devInfo = new FT_DEVICE_LIST_INFO_NODE[numDevs];
ftStatus = FT_GetDeviceInfoList(devInfo, &numDevs);
ftStatus = lib->get_device_info_list(devInfo, &numDevs);
if (ftStatus != FT_OK)
err = QString("FT_GetDeviceInfoList: %1").arg(ftStatus);
else {

11
src/Device.cpp
View File

@@ -37,10 +37,13 @@ Device::listDevices(QString &err)
QVector<DevicePtr> result;
for (int i = 0; listFunctions && i < listFunctions->size(); ++i) {
QVector<DevicePtr> tmp = (*listFunctions)[i](err);
if (err != "")
return result;
for (int j = 0; j < tmp.size(); ++j)
result.append(tmp[j]);
if (err == "") {
for (int j = 0; j < tmp.size(); ++j)
result.append(tmp[j]);
}
else {
err += "\n";
}
}
return result;
}

2
src/src.pro
View File

@@ -6,7 +6,7 @@ INCLUDEPATH += /usr/local/qwt/include /sw/include /usr/local/include
CONFIG += static debug
QT += xml
LIBS += /usr/local/qwt/lib/libqwt.a
LIBS += -lm -lz -lftd2xx
LIBS += -lm -lz
QMAKE_CXXFLAGS += -DGC_BUILD_DATE=\\\"`date +'\"%a_%b_%d,_%Y\"'`\\\"
QMAKE_CXXFLAGS += -DGC_SVN_VERSION=\\\"`svnversion . | cut -f '2' -d ':'`\\\"
QMAKE_CXXFLAGS += -DGC_MAJOR_VER=1