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Mein Interview zum Galactic Developments Open Source Science Fiction Projekt ist online auf dem Flyficfiction Fantasy Blog.
_happy_reading()
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| Diese informative Grafik soll zeigen, wie man aus einer schönen Umsatzentwicklung durch zusätzliche Pfeile eine bedenkliche Marktsättigung herbeiargumentieren kann. (Quelle: FAZ.net) |
Recently I was programming with WebKit. I am trying to handle all errors, log them appropriately and discovered an error, that should not happen. If WebKit navigates to a URL and the navigation is cancelled by another navigation, then WebKit throws an error. A pseudo error. Quite a normal approach.
It would be nice, if my error handler could distinguish between real errors and pseudo error Fortunately the error handler gets an error code. The code is -999. A strange number. Could it be, that there are 1000 error cases and just by chance NAVIGATION_CANCELLED is number -999. Probably not.
Stepping a bit closer to the error source, we discover in WebFrame.cpp:
ResourceError WebFrame::cancelledError(const ResourceRequest& request)
{
// FIXME: Need ChickenCat to include CFNetwork/CFURLError.h to get these values
// Alternatively, we could create our own error domain/codes.
return ResourceError(String(WebURLErrorDomain), -999, request.url().string(), String());
}
Looks like -999 is a hack. Other error condition have "real" codes:
ResourceError WebFrame::blockedError(const ResourceRequest& request)
{
// FIXME: Need to implement the String descriptions for errors in the WebKitErrorDomain and have them localized
return ResourceError(String(WebKitErrorDomain), WebKitErrorCannotUseRestrictedPort, request.url().string(), String());
}
Als CTO der Deutschen Messe Interactive (DMI), einer neuen Tochter der Deutschen Messe AG in Hannover, suche ich für die IT-Abteilung mehrere Leute:
While searching for prior art for Eolas' claims, that the U.S. Patent No. 7,599,985 covers AJAX, I just discovered this:
Print.c(310): PrintHistoryItem(conn, style, "22.05.1998", "1.13.6", "hw", "Split off Primitives from Command, added module HtmlUI");
Print.c(308): PrintHistoryItem(conn, style, "22.06.1998", "1.14", "hw", "response=application/x-html-formencoded response data");
Response.c(363):
#define RESPONSECODER_FORM_HEAD "<HTML>\n<BODY BGCOLOR=\"#%s\">\n<FORM name=\"%s\">\n"
#define RESPONSECODER_FORM_ITEM "<INPUT name=\"%s\" type=\"hidden\" value=\"%s\">\n"
//#define RESPONSECODER_FORM_ITEM "<INPUT name=\"%s\" type=\"text\" value=\"%s\"><br>\n"
#define RESPONSECODER_FORM_TAIL "</FORM>\n</BODY>\n</HTML>\n"
Response.c(524):
int CBResponseCoder_Add(ResponseCoder *coder, char *name, char *value)
{
int ok= false;
if (coder == NULL) return ok;
if (! strcasecmp(coder->codertype, QUERYARG_RESPONSE_VALUE_FORM)) {
if (coder->cnt+ strlen(name)+ strlen(value)+ strlen(RESPONSECODER_FORM_ITEM) +1 < coder->size) {
sprintf(&(coder->buf[coder->cnt]), RESPONSECODER_FORM_ITEM, name, value);
coder->cnt+= strlen(&(coder->buf[coder->cnt]));
ok= true;
} else {
TRACE(TR_ERR, "CBResponseCoder_Add: RESPONSECODER_MAX_ITEM_LEN exceeded");
}
} else if (! strcasecmp(coder->codertype, QUERYARG_RESPONSE_VALUE_JSCOOKIE)) {
if (coder->cnt+ 64+ strlen(name)+ strlen(value)+ strlen(RESPONSECODER_JSCOOKIE_ITEM) + strlen(gMyDomainName) + 1 < coder->size) {
char gCookieDomainName[MAX_HOST_NAME_SIZE];
sprintf(&(coder->buf[coder->cnt]), RESPONSECODER_JSCOOKIE_ITEM, name, value, assert2dots(gCookieDomainName, gMyDomainName));
coder->cnt+= strlen(&(coder->buf[coder->cnt]));
ok= true;
} else {
TRACE(TR_ERR, "CBResponseCoder_Add: RESPONSECODER_MAX_ITEM_LEN exceeded");
}
} else if (! strcasecmp(coder->codertype, QUERYARG_RESPONSE_VALUE_KEYVALUE)) {
if (coder->cnt+ strlen(name)+ strlen(value)+ strlen(RESPONSECODER_KEYVALUE_ITEM) + 1 < coder->size) {
sprintf(&(coder->buf[coder->cnt]), RESPONSECODER_KEYVALUE_ITEM, name, value);
coder->cnt+= strlen(&(coder->buf[coder->cnt]));
ok= true;
} else {
TRACE(TR_ERR, "CBResponseCoder_Add: RESPONSECODER_MAX_ITEM_LEN exceeded");
}
} else {
if (coder->cnt+ strlen(value)+ 1 < coder->size) {
sprintf(&(coder->buf[coder->cnt]), RESPONSECODER_PLAIN_ITEM, value);
coder->cnt+= strlen(&(coder->buf[coder->cnt]));
ok= true;
} else {
TRACE(TR_ERR, "CBResponseCoder_Add: coder->size exceeded");
}
}
return ok;
}
Command.c(1203):
if (!strncasecmp(subsubsection->part, SUBSUBSECTION_PROPERTIES, strlen(SUBSUBSECTION_PROPERTIES))) {
// GET /users/<id>/properties/<propertyname>
PropertyList *propertylist= NULL;
// ListHdr cmd_params;
// ResponseCoder *coder= NULL;
// ClearList(&cmd_params);
// StringPartArgs2List(theJob->args, &cmd_params);
if (subsubsection->next != NULL) {
name= subsubsection->next->part;
TRACE(TR_CMD, "GET /%s/%s/%s/%s\n", notnullptr(section->part), notnullptr(subsection->part), notnullptr(subsubsection->part), notnullptr(name));
if ((propertylist= CBClient_GetProperties(theClient)) != NULL) {
value= CBProperty_FindPropertyInList(propertylist, name);
if (value != NULL) {
Elem *param= NULL;
if (FindCaseNamedElemInList(CMD_PARAM_RESPONSE, (Elem**) ¶m, &cmd_params)) {
coder= CBResponseCoder_New(ReadStrElem(param));
} else {
coder= CBResponseCoder_New("");
}
if (coder != NULL) {
CBResponseCoder_Open(coder, "get_single_property_response");
CBResponseCoder_Add(coder, name, value);
CBResponseCoder_Close(coder);
JobResponse(theJob, HTTP_OK, CBResponseCoder_GetType(coder), CBResponseCoder_GetData(coder), CBResponseCoder_GetLength(coder));
CBResponseCoder_Dispose(coder);
} else JobResponse(theJob, HTTP_INTERNALERROR, HTTP_CONTENT_HTML, "CBResponseCoder_New failed", 0);
} else JobResponse(theJob, HTTP_NOTFOUND, HTTP_CONTENT_HTML, "no such property available", 0);
} else JobResponse(theJob, HTTP_NOTFOUND, HTTP_CONTENT_HTML, "no properties available", 0);
...