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Let's get error handling right first time now.

This commit is contained in:
Pietro Gagliardi 2014-12-07 13:23:39 -05:00
parent 545743090e
commit fe78114ec1
1 changed files with 26 additions and 9 deletions
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35
wintable/new/main.c
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@ -39,6 +39,10 @@ enum {
nTableColumnTypes,
};
void (*tablePanic)(const char *, DWORD) = NULL;
#define panic(...) (*tablePanic)(__VA_ARGS__, GetLastError())
#define abort $$$$ // prevent accidental use of abort()
struct table {
HWND hwnd;
HWND header;
@ -65,9 +69,10 @@ static LRESULT CALLBACK tableWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM
if (uMsg == WM_NCCREATE) {
CREATESTRUCTW *cs = (CREATESTRUCTW *) lParam;
// TODO use HeapAlloc() or something to make the last error reasonable
t = (struct table *) malloc(sizeof (struct table));
if (t == NULL)
abort();
panic("error allocating internal Table data structure");
ZeroMemory(t, sizeof (struct table));
t->hwnd = hwnd;
SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) t);
@ -87,10 +92,22 @@ static LRESULT CALLBACK tableWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
void makeTableWindowClass(void)
static void deftablePanic(const char *msg, DWORD lastError)
{
fprintf(stderr, "Table error: %s (last error %d)\n", msg, lastError);
fprintf(stderr, "This is the default Table error handler function; programs that use Table should provide their own instead.\nThe program will now abort.\n");
#undef abort
abort();
#define abort $$$$
}
void initTable(void (*panicfunc)(const char *msg, DWORD lastError))
{
WNDCLASSW wc;
tablePanic = panicfunc;
if (tablePanic == NULL)
tablePanic = deftablePanic;
ZeroMemory(&wc, sizeof (WNDCLASSW));
wc.lpszClassName = tableWindowClass;
wc.lpfnWndProc = tableWndProc;
@ -100,7 +117,7 @@ void makeTableWindowClass(void)
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.hInstance = GetModuleHandle(NULL);
if (RegisterClassW(&wc) == 0)
abort();
panic("error registering Table window class");
}
int main(int argc, char *argv[])
@ -113,8 +130,8 @@ int main(int argc, char *argv[])
icc.dwSize = sizeof (INITCOMMONCONTROLSEX);
icc.dwICC = ICC_LISTVIEW_CLASSES;
if (InitCommonControlsEx(&icc) == 0)
abort();
makeTableWindowClass();
panic("(test program) error initializing comctl32.dll");
initTable(NULL);
mainwin = CreateWindowExW(0,
tableWindowClass, L"Main Window",
WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL,
@ -122,7 +139,7 @@ int main(int argc, char *argv[])
400, 400,
NULL, NULL, GetModuleHandle(NULL), NULL);
if (mainwin == NULL)
abort();
panic("(test program) error creating Table");
SendMessageW(mainwin, tableAddColumn, tableColumnText, (LPARAM) L"Column");
SendMessageW(mainwin, tableAddColumn, tableColumnImage, (LPARAM) L"Column 2");
SendMessageW(mainwin, tableAddColumn, tableColumnCheckbox, (LPARAM) L"Column 3");
@ -133,15 +150,15 @@ int main(int argc, char *argv[])
ZeroMemory(&ncm, sizeof (NONCLIENTMETRICSW));
ncm.cbSize = sizeof (NONCLIENTMETRICSW);
if (SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, sizeof (NONCLIENTMETRICSW), &ncm, sizeof (NONCLIENTMETRICSW)) == 0)
abort();
panic("(test program) error getting non-client metrics");
font = CreateFontIndirectW(&ncm.lfMessageFont);
if (font == NULL)
abort();
panic("(test program) error creating lfMessageFont HFONT");
SendMessageW(mainwin, WM_SETFONT, (WPARAM) font, TRUE);
}
ShowWindow(mainwin, SW_SHOWDEFAULT);
if (UpdateWindow(mainwin) == 0)
abort();
panic("(test program) error updating window");
while (GetMessageW(&msg, NULL, 0, 0) > 0) {
TranslateMessage(&msg);
DispatchMessageW(&msg);